Perkinsiana Knight-Jones, 1983

Tovar-Hernández, María Ana, León-González, Jesús Ángel De & Bybee, David R., 2017, Sabellid worms from the Patagonian Shelf and Humboldt Current System (Annelida, Sabellidae): Phyllis Knight-Jones’ and José María Orensanz’s collections, Zootaxa 4283 (1), pp. 1-64 : 36

Genus Perkinsiana Knight-Jones, 1983

Remarks. The genus Perkinsiana was established by Knight-Jones (1983), in order to accommodate species previously assigned to the genera Demonax Kinberg, 1867 (= Parasabella fide Tovar-Hernández & Harris 2010 ), Potamilla Malmgren, 1866 , and Potamethus Chamberlin, 1919 . Fitzhugh (1989) provided a diagnosis slightly modified from that of Knight-Jones (1983) and indicated the genus was not united by any recognized synapomorphies, Capa (2007) amended the genus and, based on a cladistic analysis, she concluded that Perkinsiana is paraphyletic. Tovar-Hernández et al. (2012) amended the generic diagnosis of Perkinsiana , to include the presence of a palmate membrane and radiolar flanges, and three patterns of abdominal notochaetae: type A) chaetae with a broad hood, progressively tapering to distal tips in all chaetigers; type B) with a broad knee, distal ends narrowing abruptly on all chaetigers; and type C) elongate, with a narrow hood.

In this study, Perkinsiana antarctica ( Kinberg, 1867) and Perkinsiana assimilis ( McIntosh, 1885) are redescribed and reported for several localities off Uruguay, Argentina and Chile. Sabella magalhaensis Kinberg, 1867 is transferred to Perkinsiana , and P. littoralis Hartman, 1967 is synonymized to it. Perkinsiana antarctica was found in intertidal zones; P. assimilis , from 90–500 m depth, and P. magalhaensis , from 3–20 m depth. Six species of Perkinsiana from South America are currently valid ( Table 2).