Revision of Hermadion Kinberg, 1856, with a redescription of Hermadion magalhaensi Kinberg, 1856, Adyte hyalina (G. O. Sars, 1873) n. comb. and Neopolynoe acanellae (Verrill, 1881) n. comb. (Polychaeta: Polynoidae) Author Bock, Gordon Author Fiege, Dieter Author Barnich, Ruth text Zootaxa 2010 2554 45 61 journal article 10.5281/zenodo.196874 13b5e906-5602-4ed0-b3b6-759e1dd022d2 1175-5326 196874 Genus Adyte Saint-Joseph, 1899 Type species. Hermadion assimile McIntosh, 1874 ; junior synonym of Hermadion ? hyalinus G. O . Sars, 1873 [new synonymy]. Diagnosis. Body dorsoventrally flattened, long, with up to 70 segments. Fifteen pairs of elytra covering dorsum on segments 2, 4, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 26, 29, and 32, leaving long tail uncovered. Prostomium bilobed, without cephalic peaks, with three antennae; lateral antennae inserted ventrally to median antenna; two pairs of eyes and a pair of palps present. Parapodia biramous, notopodia shorter and on anterodorsal side of neuropodia; notopodia with elongate acicular lobe, notoaciculum penetrating epidermis; neuropodia with truncate, rounded acicular lobe, without supra-acicular process, neuroaciculum not penetrating epidermis. Notochaetae stouter than neurochaetae, with few, scattered rows of spines and blunt, slightly notched tip; neurochaetae more numerous, with semi-lunar pocket subdistally, numerous faint rows of spines only distally, and minutely bidentate or unidentate tip. Remarks. Hermadion assimile McIntosh, 1874 and H. echini Giard, 1886 were synonymized by Fauvel (1923) and referred to Scalisetosus assimilis ( McIntosh, 1874 ) due to the presence of neurochaetae with semilunar pockets and the absence of cephalic peaks. In her revision of the heterogeneous genus Scalisetosus McIntosh, 1885 , Pettibone (1969) referred Scalisetosus assimilis to Adyte which is mainly characterized by a long body with up to 70 segments, the lack of distinct cephalic peaks, neuropodial acicular lobe truncate, rounded, neuroaciculum not penetrating, and neurochaetae with semi-lunar pockets and minutely bidentate or unidentate tip. Hermadion , in contrast, is short-bodied (with up to 50 segments), its neuropodial acicular lobe is elongate, neuroaciculum penetrating the epidermis, the neurochaetae do not have semi-lunar pockets and their tip is always unidentate.