Haplosyllis

Haplosyllis is a genus of annelids belonging to the family Syllidae. The genus has cosmopolitan distribution.

== Description == Members of the genus Haplosyllis differ in size from less than 0.1 mm in length up to 6 cm, and are dorsally arched and ventrally flat, like most Syllids. Most species are white to yellow in colour and are without coloured markings. The genus is defined by the presence of one pharyngeal tooth and an additional pharyngeal trepan.