Achaeta unibulba sp. n., a widespread European species (Oligochaeta, Enchytraeidae) (original) (raw)
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Achaeta diddeni sp. nov. (Enchytraeidae, Clitellata) from the northern German lowlands
Achaeta diddeni sp. nov. is described from different grassland sites in the northern German lowlands. The new species belongs to a group of small Achaeta species without bottleshaped glands and with spermathecae restricted to V. Having two pairs of postseptal pharyngeal glands in V and VI and the dorsal blood vessel originating in VII, it is similar to A. iberica A. pannonica Graefe, 1989. With the latter it shares the displacement of all sexual organs (except the spermathecae) one segment forward. It differs from A. pannonica in the number of lens-shaped epidermal glands being as in A. iberica, and in the number of preclitellar nephridia having two pairs from 6/7 to 7/8 instead of three. The species was found in slightly acid to neutral floodplain soils of the rivers Ems (Lower Saxony) and Elbe (Brandenburg) as well as at soil monitoring sites on the Isle of Föhr (Schleswig-Holstein).
A guide to European terrestrial and freshwater species of Enchytraeidae (Oligochaeta)
A guide to European terrestrial and freshwater enchytraeid species is presented, designed for the identification of living specimens. Altogether 206 species are included. Recent taxonomic advances regarding new species, revisions, and improved standards of description are integrated. Marine and exotic species are excluded. The illustrated keys are preceded by introductions into the taxonomic traits, the general anatomy of enchytraeids, and the technique of handling living worms during the identification process. Due to persistent taxonomic problems in many groups, a 'sensu lato' approach is adopted in the circumscription of several common species. Bryodrilus ehlersi glandulosus Dózsa-Farkas, 1990 and Enchytraeus christenseni bisetosus Rota & Healy, 1994 are elevated to species rank; the latter receives a new name, Enchytraeus dichaetus, due to homonymy with Enchytraeus bisetosus Levinsen, 1884, now Fridericia bisetosa. Marionina libra Nielsen & Christensen, 1959 is transferr...
Estonian Enchytraeidae (Oligochaeta) 2. Results of a faunistic workshop held in May 2004
2005
This paper contains the results of a taxonomic workshop held at the Võrtsjärv Limnological Station on 15-22 May 2004, following the 6th International Symposium on Enchytraeidae. A total of 58 samples were taken from a wide diversity of habitat types; 44 enchytraeid taxa were distinguished, * Corresponding author, ttimm@zbi.ee 256 40 of them were identified to species level. Twelve nominal species are new for Estonia. Of these two species, one each of Achaeta and Fridericia, are new to science; they are described separately in this volume. Further species new to Estonia are: Bryodrilus ehlersi, Buchholzia fallax, Fridericia argillae, F. benti, F. christeri, F. maculatiformis, F. minor, F. rendsinata, F. waldenstroemi, and Mesenchytraeus flavus. The taxonomic status of Timmodrilus oligoseta and Achaeta petseri, species newly described for Estonia in previous papers, is uncertain, they are possibly junior synonyms. One tubificid species was found, Rhyacodrilus falciformis, this being the first record of the species from soil in Estonia. Together with previous publications, there are now 46 enchytraeid species recorded from Estonia.
2019
A new species of enchytraeids with peculiar characters is described, Enchytraeus demutatus sp. nov. The species differs from all known species of Enchytraeus in features of the oesophageal appendages and the male efferent apparati. The oesophageal appendages insert ventro-laterally below the pharyngeal pad and not dorsally behind the pad, as is usual in the genus; furthermore, their histology is different. The male efferent apparati have each an unusually wide and short vas deferens, and accessory glands are attached to the inner surface of the male glandular bulb, in close vicinity to the male pore. The remaining characters agree with the genus diagnosis of Enchytraeus, notably the presence of testis sacs and oesophageal appendages. The bisetose worms are about 5 mm long and 0.2–0.3 mm wide. The peculiarities of the oesophageal appendages raised the possibility to place the species in a new genus. DNA sequencing was performed to provide molecular identifiers and to assess the gener...
Enchytraeids (Oligochaeta, Enchytraeidae) of Warsaw and Mazovia
Memorabilia Zoologica 34, 1981
The study on the species composition and abundance of the Enchytraeidae living in Warsaw was carried out on 24 plots in 1974-1977. In this period 22 species were recorded of eight genera, among which the genus Fridericia Mich, was most numerous (Tab. 1). The highest number of species occurred in the soils of parks, green areas of housing estates, and lawns in the centre of the town. Four geographical groups of species have been distinguished: European (50.0%), Holarctic (37.5%), cosmopolitan (= geopolitan) (8.3%), and Palaearctic (4.2%) (Tab. 2). No association of individual species with particular habitats was found. But the numbers of species and individuals were considerably higher on the plots located under or near the canopy of trees and shrubs. All the urban plots were generally characterized by considerably lower numbers of Enchytraeidae than other anthropogenic habitats, especially agroecosystems. As far as the origin of urban Enchytraeidae is concerned, local species predominate, with large ranges and high adaptability to changing environmental conditions.
New enchytraeid species (Oligochaeta: Enchytraeidae) from the Danube–Dráva National Park
Acta Zoologica Academiae Scientiarum Hungaricae, 2015
The enchytraeid fauna of the Dráva Floodplain (Bükkhát Forest Reserve, alder swamp and meadows at Kisszentmárton, and Barcs Nature Conservation Area belonging to the Danube-Dráva National Park, Hungary) was investigated for the first time. A total of 14 enchytraeid genera, including 49 species and two other annelid worms (Hrabeiella periglandulata and Rhyacodrilus falciformis) were identified. Four species: Fridericia connatiformis sp. n., F. phaeostriata sp. n., F. longiducta sp. n. and Cernosvitoviella buekkhati sp. n. are new to science and described in this paper.
Two new freshwater enchytraeid species (Oligochaeta) from the Italian Alps
Italian Journal of Zoology, 2010
Two new species found in high mountain waters of Italy representing the family Enchytraeidae are described. Cernosvitoviella longiducta n. sp. is clearly differentiated from all species in this genus by its exceptionally long sperm duct. Cognettia valeriae n. sp. belongs to a group of species having more than three pairs of pharyngeal glands and male pores situated in segment X, but differs from other species in this group by the shape of spermathecae and the well-developed seminal vesicles.
Preliminary study of Enchytraeidae (Oligochaeta) in the Tunca River (Thrace, Turkey)
Proceedings of the Estonian Academy of Sciences. Biology. Ecology
Part of the Tunca River (Tundja) is located in the European part of Turkey, Thrace region. Samples were collected monthly between June 2002 and May 2003 taking duplicates from four stations by using Ekman grab (surface 225 cm 2). During the present study 132 specimens were collected from the Tunca River. As a result of the study, a total of 8 species of Enchytraeida, comprising 1 species from the family Propappidae (Propappus volki) and 7 species from the family Enchytraeidae (Henlea perpusilla, Enchytraeus buchholzi, Cognettia glandulosa, C. sphagnetorum, Cognettia sp., Fridericia sp., and Lumbricillus sp.), were identified. All species in this study are new records for the Turkish segment of the Tunca River.