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Tubificidae (Clitellata, Oligochaeta) from Lake Taimyr, North Siberia, with a description of two new species and Lamadrilus gen. nov.
Timm, T. (1998). Tubificidae (Clitellata, Oligochaeta) from Lake Taimyr, North Siberia, with a description of two new species and Lamadrilus gen. nov. Bull. K. Belg. Inst. Nat. Wet. 68: 23-42
In: Bulletin. Institut Royal des Sciences Naturelles de Belgique. Mededelingen. Koninklijk Belgisch Instituut voor Natuurwetenschappen. KBIN: Brussel. ISSN 0368-0177, more
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  • Timm, T.

Abstract
    Seven tubificid species are reported from benthic samples collected in 1943-1944 in the large, but shallow, polar Lake Taimyr. The subartic Alexandrovia ringulata Sokolskaja, 1961 was very abundant on shallows. Among the species limited to the profundal zone, Baikalodrilus alienus spec. nov. and Lamadrilus sorosi gen. nov. spec. nov. belong to the genera distributed mainly in Lake Baikal. The new genus Lamadrilus of the subfamily Tubificinae has a tubular atrium and a short, often asymmetrical penial sheath. Both the vas deferens and prostatic gland enter the atrium subapically, leaving the proximal end free as in the marine genus Tubificoides Lastockin, 1937 but without any clear histological separation from the rest of the atrium. Apart from L.sorosi gen. nov. spec. nov. four Baikalian species are included in this genus: Isochaetides excavatus Hrabe, 1982 as the type species; I. eximius Semernoj, 1982; Tubifex bazikalovae Cekanovskaja, 1975 with several subspecies; and T. crassiseptus Semernoj, 1982. Limnodrilus profundicola (Verril, 1871), Tasserkidrilus acapillatus (Finogenova, 1972) and two other taxa represented by immatures only, have also been found.

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