Two new species of the caridean genus Nematocarcinus A. Milne-Edwards, 1881 are reported from deep-sea hydrothermal vents on the East Pacific Rise. Nematocarcinus burukovskyi n. sp. is provisionally assigned to Nematocarcinus, but is clearly distinguished from known congenerics by several morphological characters. Nematocarcinus ovalis n. sp., described from a single ovigerous female, is similar to N. faxoni Burukovsky, 2001, also known from the Eastern Pacific. In addition, a single ovigerous female of an indeterminate species of the genus (Nematocarcinus sp.) is also mentioned. Although species of Nematocarcinus were commonly observed in situ at vents, they are not vent-endemic.
Crustacea, Decapoda, Caridea, Nematocarcinidae, Nematocarcinus, hydrothermal vents, East Pacific Rise, new species.