PEOSIDRILOIDES, A NEW GENUS, AND NEW RECORDS OF PEOSIDRILUS (OLIGOCHAETA, TUBIFICIDAE) FROM THE UNITED-STATES, WITH THE DESCRIPTION OF A NEW SPECIES FROM THE GULF-OF-MEXICO

Peosidrilus biprostatus Baker and Erseus, 1979, is recorded from the G ulf of Mexico, P. coeloprostatus (Cook, 1969) from Maine, and both P. biprostatus and P. acochlearis (Erseus and Loden, 1981) are reported f rom bathyal depths (off North Carolina) for the first time. Peosidrilo ides, new genus, does not have lateral spermathecal pores, the feature regarded as an autapomorphy of Peosidrilus Baker and Erseus, 1979. Pe osidriloides hornensis, new species, from the northern Gulf of Mexico, shares some apomorphic features (a short clitellum, long vasa deferen tia) with Peosidriloides flabellifer (Erseus, 1984), new combination, but is distinguished from that species by its more numerous anterior s etae, its more ventral spermathecal pores, its wider vasa deferentia, and its possession of penial organs.