Pectinariidae (Annelida, Terebelliformia) from off southeastern Brazil, southwestern Atlantic Author Nogueira, João Miguel De Matos Author Ribeiro, William M. G. Author Carrerette, Orlemir Author Hutchings, Pat text Zootaxa 2019 2019-03-28 4571 4 489 509 journal article 27805 10.11646/zootaxa.4571.4.3 89217b4b-720f-409c-9b30-69c6b7332391 1175-5326 2614189 62AE5784-A6E5-479B-835A-32B5F9828FC3 Genus Petta Malmgren, 1866 Type species. Petta pusilla Malmgren, 1866 , by monotypy. Diagnosis. Pectinariids with smooth cephalic veil, with medial tentacular extension, free from opercular lobe, smooth margin of opercular lobe, poorly-marked separation between scaphe and abdomen, and avicular uncini with transverse rows of progressively shorter teeth distalwards ( Hutchings & Peart 2002 ). In addition, the branchiae and the anal flaps are distinctly shorter than among members of other genera of pectinariids, the latter shorter than scaphal lateral papillae, while the anal cirrus is remarkably longer. FIGURE 7. Pectinaria nonatoi n. sp. (Paratype 10, ZUEC Pol 21340), SEM, (A–D). Uncini; (E). Close up of anterior pegs of uncini; (F–H). Scaphal hooks under different angles. Remarks. Prior to the present study, Petta was a genus comprising only four species. The type species is known from off Sweden , and the other species were described from specimens collected as far apart as in the Caribbean and Gulf of Mexico , Kerguelen Islands and Indonesia . Therefore, the present study brings the first record for species of this genus for the southern Atlantic. Although Petta has few valid species currently, in most cases they are known only from type material, which in some cases is lost or in poor condition, and the descriptions do not include several important taxonomic characters. A revision of the genus is currently under preparation by Zhang et al.