Abstract
A new species of family Pilargidae, Ancistrosyllis matlaensis n. sp. is described from the Sundarban Estuarine System, India. The new species can be distinguished from its congeners by a combination of characters: absence of median antenna and eyes, shape of tentacular and dorsal cirri, structure of notopodia and neuropodia, and first appearance of notopodial hooks. The new species closely resembles Ancistrosyllis falcata.
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