Ralf Bastrop - Academia.edu (original) (raw)

Papers by Ralf Bastrop

Research paper thumbnail of Redescription of Manayunkia caspica Annenkova, 1929 and M. danubialis Băcescu, 1944 n. comb. (Fabriciidae, Sabellida, Polychaeta)

Research paper thumbnail of Effects of salinity on vitamin B6 deficiency in rainbow trout (Salmo Gairdneri Richardson)

Comparative biochemistry and physiology. B. Comparative biochemistry, 1988

Alntraet-l. The link between vitamin !] 6 deficiency and sea water adaptation in rainbow trout wa... more Alntraet-l. The link between vitamin !] 6 deficiency and sea water adaptation in rainbow trout was investigated. 2. A plasma-hyperosmotic salinity (20%0) exacerbates the effect of vitamin B 6 deficiency in rainbow trout. 3. Na/K-ATPase activity in the gill and kidney of the rainbow trout is not affected by vitamin B 6 deficiency.

Research paper thumbnail of CDK4, and MC1R genes in human congenital melanocytic naevi

Research paper thumbnail of Increasing densities of an invasive polychaete enhance bioturbation with variable effects on solute fluxes

Scientific Reports, 2018

Bioturbation is a key process affecting nutrient cycling in soft sediments. The invasive polychae... more Bioturbation is a key process affecting nutrient cycling in soft sediments. The invasive polychaete genus Marenzelleria spp. has established successfully throughout the Baltic Sea increasing species and functional diversity with possible density-dependent effects on bioturbation and associated solute fluxes. We tested the effects of increasing density of M. arctia, M. viridis and M. neglecta on bioturbation and solute fluxes in a laboratory experiment. Benthic communities in intact sediment cores were manipulated by adding increasing numbers of Marenzelleria spp. The results showed that Marenzelleria spp. in general enhanced all bioturbation metrics, but the effects on solute fluxes varied depending on the solute, on the density and species identity of Marenzelleria, and on the species and functional composition of the surrounding community. M. viridis and M. neglecta were more important in predicting variation in phosphate and silicate fluxes, whereas M. arctia had a larger effect ...

Research paper thumbnail of Effect of salinity on spatial distribution and cell volume regulation in two sibling species of Marenzelleria (Polychaeta: Spionidae)

Marine Ecology Progress Series, 2004

Marenzelleria sibling species Types I and II are characteristically distributed within the salini... more Marenzelleria sibling species Types I and II are characteristically distributed within the salinity gradient of the Elbe estuary. For the first time F 1-hybrids between the 2 Marenzelleria species were found. Type I inhabits mainly the isoosmotic/hyperosmotic range, while Type II and the F 1-hybrids prevail in the hypoosmotic range. A sympatric occurrence could be inferred in salinity ranges from 3.3 to 12.3 ppt. Marenzelleria sibling species Type II has been found for the first time in the North Sea (Elbe estuary). The influence of salinity on the distribution of Marenzelleria spp. was examined by laboratory experiments. In a time-course experiment with salinity changes from 10 to 25 ppt and from 25 to 10 ppt, respectively, enzyme activities and free amino acids were determined. The activities of alanine aminotransferase, aspartate aminotransferase, and glutamate dehydrogenase were always higher in Type I than in Type II. A salinity increase from 10 to 25 ppt resulted in a faster increase of the concentrations of D,L-alanine, glycine, serine, glutamate and threonine in Type I. The biochemical results showed that the capacity of cell volume regulation could be involved in the different spatial distributions of the 2 sibling species.

Research paper thumbnail of Biochemical parameters as a measure of food availability and growth in immature rainbow trout (oncorhynchus mykiss)

Comparative Biochemistry and Physiology Part A: Physiology, May 1, 1992

Rainbow trout held in brackish water (15 parts per thousand) were starved or fed different amount... more Rainbow trout held in brackish water (15 parts per thousand) were starved or fed different amounts of food. 2. A significant correlation was found between the growth rates of the different animals and the feed rates. 3. The RNA: DNA ratio in the white epaxial muscle is lowest in starved fish and increases in proportion to the feed rate and individual specific growth rate. The correlations are significant at the P < 0.01 level. 4. Liver metabolism varies according to food availability. 5. The protein synthesis capacity of the liver (RNA: DNA ratio) and liver somatic index increase as the feeding rate increases. It also correlates significantly with the specific growth rates of the different animals. 6. The intermediary metabolism of the central metabolic organ, the liver, varies in the same way. 7. The activities of the NADPH producing liver enzymes glucose&phosphate dehydrogenase (G6PDH). 6-phosphogluconate dehydrogenase (6PGDH), isocitrate dehydrogenase (IDH) and malic enzyme (ME) increase as the feed rate (and therefore the specific growth rate) increases. 8. G6PDH and IDH activity in the kidney is influenced to a much lower degree by food intake. 9. Summarizing, it can be stated that biochemical parameters can be used to describe comprehensively the metabolic status and growth of rainbow trout.

Research paper thumbnail of From synonym to valid species: Redescriptions of Ampharete acutifrons (Grube, 1860) and A. cirrata Webster & Benedict, 1887, and brief descriptions of A. baltica Eliason, 1955 and A. grubei Malmgren, 1865 (Annelida: Terebellida: Ampharetidae)

Zootaxa

This paper aims mainly to provide clarity on the morphological characters of the type species of ... more This paper aims mainly to provide clarity on the morphological characters of the type species of Ampharete, Ampharete acutifrons (Grube, 1860). Its common occurrence and wide distribution are most likely a result of misidentification of different species. Possible reasons for that are the brief original description of this species that is available solely in Latin and a series of questionable synonymizations, resulting in a confusing history of A. acutifrons. In addition to a detailed redescription of the holotype of A. acutifrons, we describe an Ampharete species from the Baltic Sea that has also been incorrectly identified as A. acutifrons for many decades. The individuals of this species agree in all diagnostic characters with those of the Northwest Atlantic species Ampharete cirrata Webster & Benedict, 1887. Since no differences were found, but it is clearly distinct from A. acutifrons, A. cirrata is recognised as a valid species and consequently deleted from the synonym list of...

Research paper thumbnail of Phylogeography of the veined squid, Loligo forbesii, in European waters

Scientific Reports

The veined squid, Loligo forbesii Steenstrup, 1856, occurs at the European Shelf areas including ... more The veined squid, Loligo forbesii Steenstrup, 1856, occurs at the European Shelf areas including the Azores and represents a valuable resource for the European commercial fishery in the North East Atlantic. However, very little is known about its population structure and phylogeography. This lack of knowledge also impedes the development of sustainable fishery management for this species. The present study combined the use of two types of markers that retrieve patterns of gene flow in different time spans; the analysis of 16 nuclear microsatellites and sequencing of the mitochondrial cytochrome oxidase subunit I (COI). Whereas the high mutation rate of microsatellites allows the description of recent patterns of connectivity in species, the lower mutation rate of COI provides phylogeographic patterns on a longer timescale. A total of 347 individuals of L. forbesii were investigated from nearly the entire distribution range of the species, including the North East Atlantic Shelf, the...

Research paper thumbnail of Figure 8 In On The Identity Of Spio Filicornis (O. F. Müller, 1776) — With The Designation Of A Neotype, And The Description Of Two New Species From The North East Atlantic Ocean Based On Morphological And Genetic Studies

FIGURE 8. Methyl green staining pattern of anterior end in ventral view with white dots in two Sp... more FIGURE 8. Methyl green staining pattern of anterior end in ventral view with white dots in two Spio species: A. Spio filicornis (O.F. Müller, 1776). B. Spio arndti sp. nov. – A from type locality (ZSRO-P2058), B from Kiel Bight (ZSRO-P2052).

Research paper thumbnail of Figure 3 In Description Of A New Species Of Sabellidae (Polychaeta, Annelida) From Fresh And Brackish Waters In Europe, With Some Remarks On The Branchial Crown Of Laonome

FIGURE 3. Laonome xeprovala sp. nov. Semithin section (1 µm) of the branchial crown. (A) Seven pa... more FIGURE 3. Laonome xeprovala sp. nov. Semithin section (1 µm) of the branchial crown. (A) Seven pairs of separated radioles but connected by palmate membrane, with dorsal and ventral lips, dorsal pinnular appendages and ventral radiolar appendages visible; (B) Dorsal pinnular appendages fused with dorsalmost radioles; parallel lamella visible (14 µm basal of section A); (C) Left and right part of the ventral lip as well as the parallel lamella fused with one another (5 µm basal of section B); (D) Most radioles fused with one another; parallel lamella broadened (23 µm basal of section C); (E) Right part of dorsal lip fused with basal part of dorsalmost radiolus (22 µm basal of section D); (F) Right and left parts of dorsal lip fused with one another; parallel lamella disconnected in the middle (21 µm basal of section E); (G) Branchial crown fused with the collar ventrally; skeletal cell bars of the left and the right radiolar lobes distinctly separated (19 µm basal of section F); (H) ...

Research paper thumbnail of Description, habitat range and seasonality of a new non-indigenous polychaete Laonome sp. (Sabellida, Sabellidae) the north-eastern Baltic Sea

Research paper thumbnail of Figure 1 In Description Of A New Species Of Sabellidae (Polychaeta, Annelida) From Fresh And Brackish Waters In Europe, With Some Remarks On The Branchial Crown Of Laonome

FIGURE 1. Collection sites of Laonome xeprovala sp. nov. Pärnu Bay (1), Hollandse Ijssel (2), Van... more FIGURE 1. Collection sites of Laonome xeprovala sp. nov. Pärnu Bay (1), Hollandse Ijssel (2), Van Harinxmakanaal (3), Kiel Canal (4), Hallsfjärden (5), Taganrog Bay (6).

Research paper thumbnail of Figure 5 In Description Of A New Species Of Sabellidae (Polychaeta, Annelida) From Fresh And Brackish Waters In Europe, With Some Remarks On The Branchial Crown Of Laonome

FIGURE 5. Laonome xeprovala sp. nov. Semithin section (1 µm) of the radioles. (A) Cross-section o... more FIGURE 5. Laonome xeprovala sp. nov. Semithin section (1 µm) of the radioles. (A) Cross-section of two separated radioles with skeletal cells and blood vessel; (B) Longitudinal section of a radiolus with skeletal cells and blood vessel; bv blood vessel, scp skeletal cells of pinnules, scr skeletal cells of radioles, ss supporting sheath tissue. Scale bars: A, B = 50 µm.

Research paper thumbnail of Spio Fabricius 1785

Genus <i>Spio</i> Fabricius, 1785 <b>Type species:</b> <i>Nereis fi... more Genus <i>Spio</i> Fabricius, 1785 <b>Type species:</b> <i>Nereis filicornis</i> Müller, 1776 <b>Type locality:</b> Iluilârssuk, near Frederikshaab (Paamiut), West Greenland <b>Synonym:</b> <i>Paraspio</i> Czerniavsky, 1881; type species: <i>Spio decoratus</i> Bobretzky, 1870, by monotypy. <i>Euspio</i> McIntosh, 1915; type species: <i>Euspio mesnili</i> McIntosh, 1915. <b>Diagnosis.</b> Prostomium anteriorly rounded or slightly incised; branchiae present from chaetiger 1, to near posterior end; hooded hooks on middle and posterior neuropodia; metameric dorsal ciliated organs present; pygidium with four anal cirri. <b>Description.</b> Prostomium anteriorly rounded or slightly incised, lacking frontal or lateral horns; eyes present or absent; digitiform occipital antenna absent, but posterior portion of prostomium may be raised or inflated. Nuchal organs ...

Research paper thumbnail of Figure 12 In On The Identity Of Spio Filicornis (O. F. Müller, 1776) — With The Designation Of A Neotype, And The Description Of Two New Species From The North East Atlantic Ocean Based On Morphological And Genetic Studies

FIGURE 12. Spio symphyta sp. nov.: A. Anterior end, dorsal view. B. Anterior dorsum, dorsal view.... more FIGURE 12. Spio symphyta sp. nov.: A. Anterior end, dorsal view. B. Anterior dorsum, dorsal view. C. Anterior end, dorsal view; nuchal organ and dorsal ciliated organs well observable in specimen stained with methyl green. D. Neuropodial hooks from chaetiger 20, lateral view. E. Neuropodial hook from 18th last chaetiger, anterior oblique view; arrow points at uppermost 3rd tooth. F. Anteriormost region, dorsal view; arrow points at fusion between prostomium and peristomium; specimen stained with methyl green. G. Ventrum of chaetigers 13–15, with pattern of white dots (arrows) discernible in specimen stained with methyl green. — A, B (without number, 53°43.941N, 6°31.310E, 23.9 m, 23.07.2008), C, F (ZMH P-25911), D (ZSRO- P2065), E (ZSRO-P2063), G (ZSRO-P1862).

Research paper thumbnail of Figure 7 In Description Of A New Species Of Sabellidae (Polychaeta, Annelida) From Fresh And Brackish Waters In Europe, With Some Remarks On The Branchial Crown Of Laonome

FIGURE 7. Laonome spp. Methyl green staining pattern of peristomium and thoracic region. A–C. L. ... more FIGURE 7. Laonome spp. Methyl green staining pattern of peristomium and thoracic region. A–C. L. xeprovala sp. nov. (A) Ventral view; (B) Lateral view; (C) Dorsal view; D–F. L. calida. (D) Ventral view; (E) Lateral view; (F) Dorsal view; G–I. L. kroyeri. (G) Ventral view; (H) Lateral view; (I) Dorsal view. Scale bars: A–F = 500 µm, G–I = 1000 µm.

Research paper thumbnail of Figure 6 In Description Of A New Species Of Sabellidae (Polychaeta, Annelida) From Fresh And Brackish Waters In Europe, With Some Remarks On The Branchial Crown Of Laonome

FIGURE 6. Laonome xeprovala sp. nov. (A) Anterior end, dorsolateral view; (B) Anterior end, ventr... more FIGURE 6. Laonome xeprovala sp. nov. (A) Anterior end, dorsolateral view; (B) Anterior end, ventral view; (C) Posterior end, lateral view; (D) Notopodial spines of the first chaetiger; (E) Inferior paleate chaetae of thoracic notopodia; (F) Companion chaeta of thoracic neuropodial; (G) Thoracic uncini; (H) Abdominal uncini. Scale bars: A, B = 200 µm, C = 100 µm, D = 20 µm, E, G, H = 10 µm, F = 5 µm.

Research paper thumbnail of Figure 1 In On The Identity Of Spio Filicornis (O. F. Müller, 1776) — With The Designation Of A Neotype, And The Description Of Two New Species From The North East Atlantic Ocean Based On Morphological And Genetic Studies

FIGURE 1. Drawings from the description of Spio filicornis (O.F. Müller, 1776) from Fabricius (17... more FIGURE 1. Drawings from the description of Spio filicornis (O.F. Müller, 1776) from Fabricius (1785)—arrangement of figures slightly amended: with "worm" removed from the tube in dorsal and ventral view; "worm" emerging from the tube as observed in the natural environment; middle segment from dorsal; two segments from lateral oblique view. Abbreviations: a=the tube, b=sea bed, c=the worm emerging from the tube, d=prostomium, e=eyes, f=mouth opening, g=palps, h=anterior dark segments, i=middle yellow-reddish segments, k=posterior dark segments, l=greyish stripe on dorsum, m=same on ventrum, n=anal cirri, o=dorsal "Fühlfäden", p=parapodia, q=ventral projection, r=lateral furrow, s=ventrum.

Research paper thumbnail of Figure 2 In Description Of A New Species Of Sabellidae (Polychaeta, Annelida) From Fresh And Brackish Waters In Europe, With Some Remarks On The Branchial Crown Of Laonome

FIGURE 2. Laonome xeprovala sp. nov. Photographs from specimens collected in the Taganrog Bay, Se... more FIGURE 2. Laonome xeprovala sp. nov. Photographs from specimens collected in the Taganrog Bay, Sea of Azov. (A) Anterior end; (B) Complete specimen

Research paper thumbnail of On the identity of Spio filicornis (O.F. Müller, 1776)—with the designation of a neotype, and the description of two new species from the North East Atlantic Ocean based on morphological and genetic studies

Zootaxa, 2011

The aim of this study is to solve taxonomic problems pertaining to Spio filicornis (O.F. Müller, ... more The aim of this study is to solve taxonomic problems pertaining to Spio filicornis (O.F. Müller, 1776). The original description by O. F. Müller was very brief and type material was not deposited. Based on the literature the confusion about the identity of the species has been tremendous; e.g., it was only recently realized that at least two different species from the North and Baltic Seas could be identified as S. filicornis (Bick et al. 2010). The present study is based on material collected by the authors in 2009 at the type locality in Iluilârssuk, near Paamiut, SW Greenland. Spio filicornis is redescribed in detail and illustrated comprehensively. A neotype has been designated and deposited in the collection of Rostock University. Species formerly referred to as S. cf. filicornis from the North and Baltic Seas (Bick et al. 2010) are formally described as two new species, Spio arndti sp. nov., and S. symphyta sp. nov. The morphological diagnostic characters within Spio are discu...

Research paper thumbnail of Redescription of Manayunkia caspica Annenkova, 1929 and M. danubialis Băcescu, 1944 n. comb. (Fabriciidae, Sabellida, Polychaeta)

Research paper thumbnail of Effects of salinity on vitamin B6 deficiency in rainbow trout (Salmo Gairdneri Richardson)

Comparative biochemistry and physiology. B. Comparative biochemistry, 1988

Alntraet-l. The link between vitamin !] 6 deficiency and sea water adaptation in rainbow trout wa... more Alntraet-l. The link between vitamin !] 6 deficiency and sea water adaptation in rainbow trout was investigated. 2. A plasma-hyperosmotic salinity (20%0) exacerbates the effect of vitamin B 6 deficiency in rainbow trout. 3. Na/K-ATPase activity in the gill and kidney of the rainbow trout is not affected by vitamin B 6 deficiency.

Research paper thumbnail of CDK4, and MC1R genes in human congenital melanocytic naevi

Research paper thumbnail of Increasing densities of an invasive polychaete enhance bioturbation with variable effects on solute fluxes

Scientific Reports, 2018

Bioturbation is a key process affecting nutrient cycling in soft sediments. The invasive polychae... more Bioturbation is a key process affecting nutrient cycling in soft sediments. The invasive polychaete genus Marenzelleria spp. has established successfully throughout the Baltic Sea increasing species and functional diversity with possible density-dependent effects on bioturbation and associated solute fluxes. We tested the effects of increasing density of M. arctia, M. viridis and M. neglecta on bioturbation and solute fluxes in a laboratory experiment. Benthic communities in intact sediment cores were manipulated by adding increasing numbers of Marenzelleria spp. The results showed that Marenzelleria spp. in general enhanced all bioturbation metrics, but the effects on solute fluxes varied depending on the solute, on the density and species identity of Marenzelleria, and on the species and functional composition of the surrounding community. M. viridis and M. neglecta were more important in predicting variation in phosphate and silicate fluxes, whereas M. arctia had a larger effect ...

Research paper thumbnail of Effect of salinity on spatial distribution and cell volume regulation in two sibling species of Marenzelleria (Polychaeta: Spionidae)

Marine Ecology Progress Series, 2004

Marenzelleria sibling species Types I and II are characteristically distributed within the salini... more Marenzelleria sibling species Types I and II are characteristically distributed within the salinity gradient of the Elbe estuary. For the first time F 1-hybrids between the 2 Marenzelleria species were found. Type I inhabits mainly the isoosmotic/hyperosmotic range, while Type II and the F 1-hybrids prevail in the hypoosmotic range. A sympatric occurrence could be inferred in salinity ranges from 3.3 to 12.3 ppt. Marenzelleria sibling species Type II has been found for the first time in the North Sea (Elbe estuary). The influence of salinity on the distribution of Marenzelleria spp. was examined by laboratory experiments. In a time-course experiment with salinity changes from 10 to 25 ppt and from 25 to 10 ppt, respectively, enzyme activities and free amino acids were determined. The activities of alanine aminotransferase, aspartate aminotransferase, and glutamate dehydrogenase were always higher in Type I than in Type II. A salinity increase from 10 to 25 ppt resulted in a faster increase of the concentrations of D,L-alanine, glycine, serine, glutamate and threonine in Type I. The biochemical results showed that the capacity of cell volume regulation could be involved in the different spatial distributions of the 2 sibling species.

Research paper thumbnail of Biochemical parameters as a measure of food availability and growth in immature rainbow trout (oncorhynchus mykiss)

Comparative Biochemistry and Physiology Part A: Physiology, May 1, 1992

Rainbow trout held in brackish water (15 parts per thousand) were starved or fed different amount... more Rainbow trout held in brackish water (15 parts per thousand) were starved or fed different amounts of food. 2. A significant correlation was found between the growth rates of the different animals and the feed rates. 3. The RNA: DNA ratio in the white epaxial muscle is lowest in starved fish and increases in proportion to the feed rate and individual specific growth rate. The correlations are significant at the P < 0.01 level. 4. Liver metabolism varies according to food availability. 5. The protein synthesis capacity of the liver (RNA: DNA ratio) and liver somatic index increase as the feeding rate increases. It also correlates significantly with the specific growth rates of the different animals. 6. The intermediary metabolism of the central metabolic organ, the liver, varies in the same way. 7. The activities of the NADPH producing liver enzymes glucose&phosphate dehydrogenase (G6PDH). 6-phosphogluconate dehydrogenase (6PGDH), isocitrate dehydrogenase (IDH) and malic enzyme (ME) increase as the feed rate (and therefore the specific growth rate) increases. 8. G6PDH and IDH activity in the kidney is influenced to a much lower degree by food intake. 9. Summarizing, it can be stated that biochemical parameters can be used to describe comprehensively the metabolic status and growth of rainbow trout.

Research paper thumbnail of From synonym to valid species: Redescriptions of Ampharete acutifrons (Grube, 1860) and A. cirrata Webster & Benedict, 1887, and brief descriptions of A. baltica Eliason, 1955 and A. grubei Malmgren, 1865 (Annelida: Terebellida: Ampharetidae)

Zootaxa

This paper aims mainly to provide clarity on the morphological characters of the type species of ... more This paper aims mainly to provide clarity on the morphological characters of the type species of Ampharete, Ampharete acutifrons (Grube, 1860). Its common occurrence and wide distribution are most likely a result of misidentification of different species. Possible reasons for that are the brief original description of this species that is available solely in Latin and a series of questionable synonymizations, resulting in a confusing history of A. acutifrons. In addition to a detailed redescription of the holotype of A. acutifrons, we describe an Ampharete species from the Baltic Sea that has also been incorrectly identified as A. acutifrons for many decades. The individuals of this species agree in all diagnostic characters with those of the Northwest Atlantic species Ampharete cirrata Webster & Benedict, 1887. Since no differences were found, but it is clearly distinct from A. acutifrons, A. cirrata is recognised as a valid species and consequently deleted from the synonym list of...

Research paper thumbnail of Phylogeography of the veined squid, Loligo forbesii, in European waters

Scientific Reports

The veined squid, Loligo forbesii Steenstrup, 1856, occurs at the European Shelf areas including ... more The veined squid, Loligo forbesii Steenstrup, 1856, occurs at the European Shelf areas including the Azores and represents a valuable resource for the European commercial fishery in the North East Atlantic. However, very little is known about its population structure and phylogeography. This lack of knowledge also impedes the development of sustainable fishery management for this species. The present study combined the use of two types of markers that retrieve patterns of gene flow in different time spans; the analysis of 16 nuclear microsatellites and sequencing of the mitochondrial cytochrome oxidase subunit I (COI). Whereas the high mutation rate of microsatellites allows the description of recent patterns of connectivity in species, the lower mutation rate of COI provides phylogeographic patterns on a longer timescale. A total of 347 individuals of L. forbesii were investigated from nearly the entire distribution range of the species, including the North East Atlantic Shelf, the...

Research paper thumbnail of Figure 8 In On The Identity Of Spio Filicornis (O. F. Müller, 1776) — With The Designation Of A Neotype, And The Description Of Two New Species From The North East Atlantic Ocean Based On Morphological And Genetic Studies

FIGURE 8. Methyl green staining pattern of anterior end in ventral view with white dots in two Sp... more FIGURE 8. Methyl green staining pattern of anterior end in ventral view with white dots in two Spio species: A. Spio filicornis (O.F. Müller, 1776). B. Spio arndti sp. nov. – A from type locality (ZSRO-P2058), B from Kiel Bight (ZSRO-P2052).

Research paper thumbnail of Figure 3 In Description Of A New Species Of Sabellidae (Polychaeta, Annelida) From Fresh And Brackish Waters In Europe, With Some Remarks On The Branchial Crown Of Laonome

FIGURE 3. Laonome xeprovala sp. nov. Semithin section (1 µm) of the branchial crown. (A) Seven pa... more FIGURE 3. Laonome xeprovala sp. nov. Semithin section (1 µm) of the branchial crown. (A) Seven pairs of separated radioles but connected by palmate membrane, with dorsal and ventral lips, dorsal pinnular appendages and ventral radiolar appendages visible; (B) Dorsal pinnular appendages fused with dorsalmost radioles; parallel lamella visible (14 µm basal of section A); (C) Left and right part of the ventral lip as well as the parallel lamella fused with one another (5 µm basal of section B); (D) Most radioles fused with one another; parallel lamella broadened (23 µm basal of section C); (E) Right part of dorsal lip fused with basal part of dorsalmost radiolus (22 µm basal of section D); (F) Right and left parts of dorsal lip fused with one another; parallel lamella disconnected in the middle (21 µm basal of section E); (G) Branchial crown fused with the collar ventrally; skeletal cell bars of the left and the right radiolar lobes distinctly separated (19 µm basal of section F); (H) ...

Research paper thumbnail of Description, habitat range and seasonality of a new non-indigenous polychaete Laonome sp. (Sabellida, Sabellidae) the north-eastern Baltic Sea

Research paper thumbnail of Figure 1 In Description Of A New Species Of Sabellidae (Polychaeta, Annelida) From Fresh And Brackish Waters In Europe, With Some Remarks On The Branchial Crown Of Laonome

FIGURE 1. Collection sites of Laonome xeprovala sp. nov. Pärnu Bay (1), Hollandse Ijssel (2), Van... more FIGURE 1. Collection sites of Laonome xeprovala sp. nov. Pärnu Bay (1), Hollandse Ijssel (2), Van Harinxmakanaal (3), Kiel Canal (4), Hallsfjärden (5), Taganrog Bay (6).

Research paper thumbnail of Figure 5 In Description Of A New Species Of Sabellidae (Polychaeta, Annelida) From Fresh And Brackish Waters In Europe, With Some Remarks On The Branchial Crown Of Laonome

FIGURE 5. Laonome xeprovala sp. nov. Semithin section (1 µm) of the radioles. (A) Cross-section o... more FIGURE 5. Laonome xeprovala sp. nov. Semithin section (1 µm) of the radioles. (A) Cross-section of two separated radioles with skeletal cells and blood vessel; (B) Longitudinal section of a radiolus with skeletal cells and blood vessel; bv blood vessel, scp skeletal cells of pinnules, scr skeletal cells of radioles, ss supporting sheath tissue. Scale bars: A, B = 50 µm.

Research paper thumbnail of Spio Fabricius 1785

Genus <i>Spio</i> Fabricius, 1785 <b>Type species:</b> <i>Nereis fi... more Genus <i>Spio</i> Fabricius, 1785 <b>Type species:</b> <i>Nereis filicornis</i> Müller, 1776 <b>Type locality:</b> Iluilârssuk, near Frederikshaab (Paamiut), West Greenland <b>Synonym:</b> <i>Paraspio</i> Czerniavsky, 1881; type species: <i>Spio decoratus</i> Bobretzky, 1870, by monotypy. <i>Euspio</i> McIntosh, 1915; type species: <i>Euspio mesnili</i> McIntosh, 1915. <b>Diagnosis.</b> Prostomium anteriorly rounded or slightly incised; branchiae present from chaetiger 1, to near posterior end; hooded hooks on middle and posterior neuropodia; metameric dorsal ciliated organs present; pygidium with four anal cirri. <b>Description.</b> Prostomium anteriorly rounded or slightly incised, lacking frontal or lateral horns; eyes present or absent; digitiform occipital antenna absent, but posterior portion of prostomium may be raised or inflated. Nuchal organs ...

Research paper thumbnail of Figure 12 In On The Identity Of Spio Filicornis (O. F. Müller, 1776) — With The Designation Of A Neotype, And The Description Of Two New Species From The North East Atlantic Ocean Based On Morphological And Genetic Studies

FIGURE 12. Spio symphyta sp. nov.: A. Anterior end, dorsal view. B. Anterior dorsum, dorsal view.... more FIGURE 12. Spio symphyta sp. nov.: A. Anterior end, dorsal view. B. Anterior dorsum, dorsal view. C. Anterior end, dorsal view; nuchal organ and dorsal ciliated organs well observable in specimen stained with methyl green. D. Neuropodial hooks from chaetiger 20, lateral view. E. Neuropodial hook from 18th last chaetiger, anterior oblique view; arrow points at uppermost 3rd tooth. F. Anteriormost region, dorsal view; arrow points at fusion between prostomium and peristomium; specimen stained with methyl green. G. Ventrum of chaetigers 13–15, with pattern of white dots (arrows) discernible in specimen stained with methyl green. — A, B (without number, 53°43.941N, 6°31.310E, 23.9 m, 23.07.2008), C, F (ZMH P-25911), D (ZSRO- P2065), E (ZSRO-P2063), G (ZSRO-P1862).

Research paper thumbnail of Figure 7 In Description Of A New Species Of Sabellidae (Polychaeta, Annelida) From Fresh And Brackish Waters In Europe, With Some Remarks On The Branchial Crown Of Laonome

FIGURE 7. Laonome spp. Methyl green staining pattern of peristomium and thoracic region. A–C. L. ... more FIGURE 7. Laonome spp. Methyl green staining pattern of peristomium and thoracic region. A–C. L. xeprovala sp. nov. (A) Ventral view; (B) Lateral view; (C) Dorsal view; D–F. L. calida. (D) Ventral view; (E) Lateral view; (F) Dorsal view; G–I. L. kroyeri. (G) Ventral view; (H) Lateral view; (I) Dorsal view. Scale bars: A–F = 500 µm, G–I = 1000 µm.

Research paper thumbnail of Figure 6 In Description Of A New Species Of Sabellidae (Polychaeta, Annelida) From Fresh And Brackish Waters In Europe, With Some Remarks On The Branchial Crown Of Laonome

FIGURE 6. Laonome xeprovala sp. nov. (A) Anterior end, dorsolateral view; (B) Anterior end, ventr... more FIGURE 6. Laonome xeprovala sp. nov. (A) Anterior end, dorsolateral view; (B) Anterior end, ventral view; (C) Posterior end, lateral view; (D) Notopodial spines of the first chaetiger; (E) Inferior paleate chaetae of thoracic notopodia; (F) Companion chaeta of thoracic neuropodial; (G) Thoracic uncini; (H) Abdominal uncini. Scale bars: A, B = 200 µm, C = 100 µm, D = 20 µm, E, G, H = 10 µm, F = 5 µm.

Research paper thumbnail of Figure 1 In On The Identity Of Spio Filicornis (O. F. Müller, 1776) — With The Designation Of A Neotype, And The Description Of Two New Species From The North East Atlantic Ocean Based On Morphological And Genetic Studies

FIGURE 1. Drawings from the description of Spio filicornis (O.F. Müller, 1776) from Fabricius (17... more FIGURE 1. Drawings from the description of Spio filicornis (O.F. Müller, 1776) from Fabricius (1785)—arrangement of figures slightly amended: with "worm" removed from the tube in dorsal and ventral view; "worm" emerging from the tube as observed in the natural environment; middle segment from dorsal; two segments from lateral oblique view. Abbreviations: a=the tube, b=sea bed, c=the worm emerging from the tube, d=prostomium, e=eyes, f=mouth opening, g=palps, h=anterior dark segments, i=middle yellow-reddish segments, k=posterior dark segments, l=greyish stripe on dorsum, m=same on ventrum, n=anal cirri, o=dorsal "Fühlfäden", p=parapodia, q=ventral projection, r=lateral furrow, s=ventrum.

Research paper thumbnail of Figure 2 In Description Of A New Species Of Sabellidae (Polychaeta, Annelida) From Fresh And Brackish Waters In Europe, With Some Remarks On The Branchial Crown Of Laonome

FIGURE 2. Laonome xeprovala sp. nov. Photographs from specimens collected in the Taganrog Bay, Se... more FIGURE 2. Laonome xeprovala sp. nov. Photographs from specimens collected in the Taganrog Bay, Sea of Azov. (A) Anterior end; (B) Complete specimen

Research paper thumbnail of On the identity of Spio filicornis (O.F. Müller, 1776)—with the designation of a neotype, and the description of two new species from the North East Atlantic Ocean based on morphological and genetic studies

Zootaxa, 2011

The aim of this study is to solve taxonomic problems pertaining to Spio filicornis (O.F. Müller, ... more The aim of this study is to solve taxonomic problems pertaining to Spio filicornis (O.F. Müller, 1776). The original description by O. F. Müller was very brief and type material was not deposited. Based on the literature the confusion about the identity of the species has been tremendous; e.g., it was only recently realized that at least two different species from the North and Baltic Seas could be identified as S. filicornis (Bick et al. 2010). The present study is based on material collected by the authors in 2009 at the type locality in Iluilârssuk, near Paamiut, SW Greenland. Spio filicornis is redescribed in detail and illustrated comprehensively. A neotype has been designated and deposited in the collection of Rostock University. Species formerly referred to as S. cf. filicornis from the North and Baltic Seas (Bick et al. 2010) are formally described as two new species, Spio arndti sp. nov., and S. symphyta sp. nov. The morphological diagnostic characters within Spio are discu...