A total of 150 specimens of Gymnoneridinae Banse were identified from the Andaman Sea and the Gulf of Thailand. Three species were recorded:
Ceratocephale andaman n.sp. with and without eyes, cirrophores enlarged on setiger 9,
Gymnonereis fauveli (Pillai, 1961) with smooth cutting edge of jaws, and
G. phuketensis n.sp. with serrated cutting edge of jaws. The generic diagnosis of
Gymnonereis is emended to include species with dorsal flaps and serrated jaws. The terminology of nereid para podia is briefly reviewed and para podia of Gymnonereidinae compared with typical Nereidinae parapodia.
