AN APPRAISAL OF THE TAXONOMIC POSITION OF ENHYDROSOMA-BUCHHOLZI (BOECK, 1872), ENHYDROSOMA-BIFURCAROSTRATUM SHEN-AND-TAI, 1965, ENHYDROSOMA-BARNISHI WELLS, 1967 AND ENHYDROSOMA-VERVOORTI FIERS, 1987 WITH DEFINITION OF 2 NEW GENERA (COPEPODA, HARPACTICOIDA, CLETODIDAE)

Some morphological features of Enhydrosoma buchholzi (BOECK, 1872), E. barnishi WELLS, 1967 and E. vervoorti FIERS, 1987 are redescribed in detail. It is shown that, in the structure of the antenna, maxillule a nd the form of sexual dimorphism on the P3 endopod, these species, alo ng with E. bifurcarostratum SHEN & TAI, 1965 and anew species from Tha iland have greater affinities with the genus Cletodes BRADY, 1872 than with Enhydrosoma BOECK, 1872. However, they cannot be included in the genus Cletodes because they display a more primitive setal formula on P3 and P4 exopod and apomorphic character states on the antennary end opod and pi of both sexes. Consequently, E. buchholzi from north-west Europe (and Canada) is assigned to the genus Strongylacron gen. nov. a nd becomes the type species by monotypy. The other four species from t he Indian Ocean and South China Sea can be clearly distinguished from Strongylacron by the structure of the rostrum. They are assigned to th e genus Schizacron gen. nov. as S. barnishi (WELLS, 1967) comb. nov., designated as the type species, S. bifurcarostratus (SHEN & TAI, 1965) comb. nov., S. vervoorti (FIERS, 1987) comb. nov. and S. intermedius sp. nov. A key to species of Schizacron is provided.