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The Types of Polychaeta in the Zoological Museum, Berlin A catalogue of holotypes, syntypes, and paratypes of about 600 species including some subspecies, of Polychaeta preserved or formerly held in the collection of worms of the Zoological Museum, Berlin is presented. The species are arranged in alphabetical order. Synonyms based on reexaminations of type specimens are noted.

On the Strongylus tetracanthus Problem and the Systematics of the Cyathostominea (Nematoda: Strongyloidea) The original specimens of the much debated cyathostomine Strongylus tetracanthus MEHLIS, 1831, the type species of Cyathostomum MOLIN, 1861, have been recovered in the Zoological Museum, Berlin. These specimens, collected from horses in Germany, could be shown to belong to 10 of the actually known cyathostomine species. Because none of the species hitherto proposed to be the ‘true’ S. tetracanthus is present in this material, the former Cyathostomum catinatum LOOSS, 1900 is decided to represent this species and a lectotype is selected for C. tetracanthum (MEHLIS, 1831) sensu novo. – Furthermore, the cephalic structures of all Central European cyathostomines have been studied comparatively. Basing on the results, a revised classification of the tribe Cyathostominea is given in form of an annotated key to the genera. Coronocyclus n. gen. is erected for Cyathostomum coronatum LOOSS, 1900 and for 3 further species formerly included in Cyathostomum MOLIN (in the sense of LICHTENFELS 1975); the latter genus is redefined. Parapoteriostomum n. gen. is erected for Cyathostoma mettami LEIPER, 1913 (= Cylicodoniophorus mettami) and for 2 further species formerly included in Cylicodontophorus IHLE (in the sense of LICHTENFELS 1975). Petrovinema ERSOV, 1943 is considered a valid genus. In addition, the identity of one genus as well as of three species and one variety with other taxa is pointed out.

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