Polydora and related genera (Polychaeta: Spionidae) from the Grand Caribbean region Author Vı Author Delgado-Blas, ctor H. text Journal of Natural History 2008 2008-01-31 42 1 - 2 1 19 http://dx.doi.org/10.1080/00222930701831240 journal article 10.1080/00222930701831240 1464-5262 4651778 Genus Dipolydora Verrill, 1879 Type species: Polydora concharum Verrill, 1879 , designated by Verrill (1881) . Diagnosis Prostomium entire or incised, extending posteriorly as caruncle. Chaetiger 1 with or without notochaetae. Chaetiger 5 with major spines of one type , with or without companion chaetae; spines arranged in single curved row. Posterior notopodial spines present or absent. Neuropodial bidentate hooded hooks from chaetigers 7–17, usually with recurved shaft without constriction; main fang forming wide angle with shaft and narrow angle with apical tooth. Branchiae begin posterior to chaetiger 5. Pygidium disc-like, cuff-shaped, with two, three, or four lobes of various forms, or with four or more small papillae. Anterior part of digestive tract sometimes with enlarged, thick gizzard-like structure. Remarks Dipolydora was resurrected by Blake (1996) ; it is one of the largest of the polydorid genera, with 36 species, and these species were arranged in five groups based on their features by Blake (1996) ; with the new species described by Sato-Okoshi and Takatsuka (2001) and Manchenko and Radashevsky (2002) there are now 40 species.