Enchytraeus demutatus sp. nov. (Enchytraeidae, Oligochaeta) has characters hitherto unrecorded in the genus (original) (raw)
Related papers
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...
Journal of Zoological Systematics and Evolutionary Research, 2009
Species identification in the Enchytraeidae is extremely difficult as in many groups of lower invertebrates. Clear-cut mor holo ical character differences which would allow an unambiguous delimitation are almost totdPly ]acting between numerous species. Conse uently, their identification and their phylogenetic relationshi s cannot be discerned b jassical morphological methods alone. We show in this study tRat comparative analysis o r D N A fragment variation found b restriction endonuclease digestions provide a suitable means for both species identification anianalysis of their phylogenetic relationships.
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.
Cejkaian tubules' in the posterior midgut of terrestrial Enchytraeidae (Oligochaeta)
More than one hundred years ago, Bohumil Čejka described peculiar elongate tubules in the posterior region of the intestine of Hepatogaster birulae, a new terrestrial enchytraeid species collected in NorthEast Siberia. The tubules have no cilia but a proper epithelium and they run parallel to the longitudinal axis of the intestine over several segments, inside the intestinal epithelium but in close contact with the blood sinus. The tubules end blindly anteriorly and with a porus to the intestinal lumen posteriorly. The number of tubules increases from posterior to anterior due to bifurcations, and their diameter decreases. Čejka hypothesized that these tubules are glands that provide secretions for the final process of digestion or that aid in the egestion of faeces. He found them only in one species, Hepatogaster birulae, which was later synonymized with Henlea ochracea. In recent years we screened a large number of terrestrial enchytraeids in vivo and found these peculiar tubules ...
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.
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.
Achaeta unibulba sp. n., a widespread European species (Oligochaeta, Enchytraeidae)
2005
Achaeta unibulba sp. n. is described from a variety of terrestrial habitats in Europe. The new species is similar to a group of species around A. eiseni Vejdovský, 1878, having bottle-shaped glands (= setal follicles) dorsally and ventrally, the latter being only slightly smaller. Its main distinguishing characters are the fused penial bulbs forming a large roundish body at the ventral midline, the absence of accessory penial glands, the arrangement of clitellum glands, the presence of a large gland at the orifice of the spermathecae, an oesophageal appendage in V without canal leading to pharynx, and the presence of three pairs of preclitellar nephridia. The species occurs in slightly acid to neutral soils. It was found in mineral horizons of mull humus forms as well as in fen peat.