Several species of the genus
Hymenaster (Asteroidea) collected in the abyssal cruises Biacores, Biogas and Polygas in the North East Atlantic Ocean make possible a synthesis of available data on the species known from the Atlantic Ocean. Two species
H.retiuclatus and
H. tenuispinus are new to science. A morphological comparative study is carried out for the 17 species reviewed and is presented in the form of a tabular key. The bathymetrical and geographical distributions are included.
