A NEW GENUS AND 2 NEW SPECIES OF TUBIFICIDAE (OLIGOCHAETA) FROM THE ABYSSAL ZONE OF LAKE-BAIKAL WITH REDESCRIPTIONS OF LYMPHACHAETA-PINNIGERA, RHYACODRILOIDES ABYSSALIS AND TUBIFEX BAZIKALOVAE
P. Martin et Ro. Brinkhurst, A NEW GENUS AND 2 NEW SPECIES OF TUBIFICIDAE (OLIGOCHAETA) FROM THE ABYSSAL ZONE OF LAKE-BAIKAL WITH REDESCRIPTIONS OF LYMPHACHAETA-PINNIGERA, RHYACODRILOIDES ABYSSALIS AND TUBIFEX BAZIKALOVAE, Zoologica scripta, 27(3), 1998, pp. 197-207
Recent sampling of the abyssal zone of Lake Baikal (Siberia) made poss
ible redescriptions of the poorly known species Lymphachaeta pinnigera
Snimschikova, Rhyacodriloides abyssalis Chekanovskaya, Tubifex bazika
lovae Chekanovskaya, and descriptions of Burchanidrilus petitbonum gen
. n., sp. n. and Rhyacodriloides gladiiseta sp. n. Lymphachaeta and Bu
rchanidrilus belong to a complex of small Tubificinae, characterised b
y true penes in penis sacs, rather simple atria, and lack of coelomocy
tes and spermatozeugmata. These mag be considered plesiomorphic charac
ter states for Tubificinae. Rhyacodriloides is still assigned to the R
hyacodrilinae, despite simple-pointed setae, the lack of coelomocytes,
the presence of single genital seta and possible 'multiple' prostates
. (C) 1998 The Norwegian Academy of Science and Letters.