Abstract
As part of a project dealing with soft bottom polychaetes from the western coasts of Acapulco Bay, Southern Mexican Pacific, 1050 specimens of the family Syllidae were collected and identified. Among them, 72 belong to two new species that are hereindescribed. Plakosyllis curvispina n. sp. (31 specimens) is the fourth known species of the genus, which is newly recorded for the Mexican Pacific. It is characterized by having compound falcigers with elongated blades, very long, fine and curved spines,and three antennae in ventral position, partially or completely covered by the prostomium. Trypanosyllis microdenticulata n. sp. (41 specimens) is characterized by having bidentate chaetae, two pairs of eyes, the anterior one in ventral position and theposterior one in dorsal position and a very small trepan with transparent teeth.
NSTL