Asteroids collected on the north part of the Mid-Atlantic Ridge by the RV
G.O. Sars in summer 2004, under the MAR-ECO programme, were studied. Asteroids were found at 17 stations, at depths ranging from 966 to 3509 m. The collection includes 32 speices. One species of
Hymenasterides is here described as new to science. This is the first record of the genus
Hymenasterides Fisher, 1911a in the Atlantic Ocean. Previously the genus
Hymenasterides included only one speices,
Hymenasterides zenognathus Fisher, 1911a from the West Pacific. The new species differs from it by a larger number of paxillar spines (9-20 instead of five to seven) and by alternate adambulacral plates with one and two spines instead of one and three. An annotated check-list is given of the asteroids in the MAR-ECO collection.