Collections of Pogonophora made by the research vessels Hakon Mosby and Pro
fessor Logachev in the Norwegian Sea in 1995-1996 contain two new species b
elonging to the genera Sclerolinum and Oligobrachia. Both species were obta
ined on the continental slope northwest of Norway in the area of an anomalo
us cold seep of a "mud volcano" type. Sclerolinum contortum sp. nov. differ
s from the congeneric species in having a rather long opisthosome with very
few segments (4-5) and tubes open at both ends and strongly folded upon th
emselves to show regular S-bends. Oligobrachia haakonmosbiensis sp. nov. is
well distinguished by a set of features, especially by the lack of glandul
ar patches on the first two segments, that is very unusual for Oligobrachia
. A detailed comparison of all species of the single genus in the subclass
Monilifera, Sclerolinum, is given.