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A new genus and two new species of Tubificidae (Oligochaeta) from the abyssal zone of Lake Baikal with redescriptions of Lymphachaeta pinnigera, Rhyacodriloides abyssalis and Tubifex bazikalovae
Author(s) -
MARTIN PATRICK,
BRINKHURST RALPH O.
Publication year - 1998
Publication title -
zoologica scripta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.204
H-Index - 64
eISSN - 1463-6409
pISSN - 0300-3256
DOI - 10.1111/j.1463-6409.1998.tb00437.x
Subject(s) - seta , abyssal zone , biology , oligochaeta (plant) , tubifex , genus , zoology , ecology , fishery
Recent sampling of the abyssal zone of Lake Baikal (Siberia) made possible redescriptions of the poorly known species Lymphachaeta pinnigera Snimschikova, Rhyacodriloides abyssalis Chekanovskaya, Tubifex bazikalovae Chekanovskaya, and descriptions of Burchanidrilus petitbonum gen. n., sp. n. and Rhyacodriloides gladiiseta sp. n. Lymphachaeta and Burchanidrilus belong to a complex of small Tubificinae, characterised by true penes in penis sacs, rather simple atria, and lack of coelomocytes and spermatozeugmata. These may be considered plesiomorphic character states for Tubificinae. Rhyacodriloides is still assigned to the Rhyacodrilinae, despite simple‐pointed setae, the lack of coelomocytes, the presence of single genital seta and possible‘multiple’prostates.