A new holothurian species Chiridota hydrothermica (Apodida: Chiridotidae) i
s described, restricted to hydrothermal vent habitats. The new species is k
nown from the west Pacific (Manus and North Fiji Basins) and the South East
Pacific Rise, between 17 and 21 degrees S. The unusual large, lobe-like te
ntacles of this holothurian, uncommon in the family Chiridotidae, could be
an adaptation to facilitate shifts between suspension- and deposit-feeding
in the hydrothermal environment. A brief review of all known records of hol
othurians and other echinoderms at hydrothermal vents is given.