Pilargidae (Annelida: Phyllodocida) from coastal and deep waters of the Southwestern Atlantic, with descriptions of two new species Author Ribeiro, Rannyele Passos 0000-0002-0304-7053 Departamento de Biología, Universidad Autónoma de Madrid, 28049, Madrid, Spain. Author Barbosa, Aline Da Cruz 0000-0002-6219-1557 Programa de Pós-Graduação em Ciências Ambientais e Conservação, Instituto de Biodiversidade e Sustentabilidade, Universidade Federal do Rio de Janeiro, 27965 - 045, Macaé, RJ, Brazil. Author Freitas, Roberta 0000-0002-2178-791X Departamento de Zoologia, Universidade Federal do Rio de Janeiro, 21941 - 599, Rio de Janeiro, RJ, Brazil. & freitas. r. roberta @ gmail. com; https: // orcid. org / 0000 - 0002 - 0816 - 761 X freitas.r.roberta@gmail.com Author Zanol, Joana 0000-0002-9464-1938 Museu Nacional, Universidade Federal do Rio de Janeiro, 20940 - 040, Rio de Janeiro, RJ, Brazil. Author Glasby, Christopher J. 0000-0002-0816-761X Museum and Art Gallery of the Northern Territory, PO Box 4646, Darwin NT 0801, Australia. Author Ruta, Christine 0000-0001-6412-6751 Departamento de Zoologia, Universidade Federal do Rio de Janeiro, 21941 - 599, Rio de Janeiro, RJ, Brazil. & christineruta @ gmail. com; https: // orcid. org / 0000 - 0001 - 6412 - 6751 christineruta@gmail.com text Zootaxa 2020 2020-11-12 4878 1 56 76 journal article 7928 10.11646/zootaxa.4878.1.2 ffe57499-723a-4ade-a574-215e0e1f8742 1175-5326 4574027 29DB126D-4751-433B-89BC-EFDD421368F7 Genus Ancistrosyllis McIntosh, 1878 Type species. Ancistrosyllis groenlandica McIntosh, 1878 , by monotypy. Remarks. The antennae of Ancistrosyllis are very small, barely larger than the body papillae; this has led to confusion about their number. The presence of a median antenna was used to separate the genus Ancistrosyllis , with one median and two lateral antennae, from Ancistargis Jones, 1961 , with two lateral antennae ( Jones 1961 ). Pettibone (1966) proposed the synonymy between these genera, considering the presence of median antenna doubtful, due to the collection and fixation artefacts that cause prostomium contraction. Emerson & Fauchald (1971) disagreed, considering the character sufficient to retain Ancistargis . Ensuing studies have substantiated claims for Ancistargis ’ synonymy ( Fitzhugh & Wolf 1990 ; Salazar-Vallejo 1987 b). Ancistrosyllis jonesi Pettibone, 1966 , from the intertidal of sandy beaches in southeast coast of Brazil , is the only species of the genus previously recorded from Brazil ( Amaral et al. 2003 ).