Two new incertae sedis syllids (Annelida: Syllidae) from Brazilian oceanic islands Author Rodolfo Leandro Nascimento E5360FF1-8981-430B-88A7-D72418FF7B03 Laboratório de Polychaeta, Departamento de Zoologia, Instituto de Biologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil & Programa dePós-graduação em Biodiversidade e Biologia Evolutiva, Instituto de Biologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil rodolfolns@ufrj.br Author Marcelo Veronesi Fukuda 6BE36A7B-8997-451C-8DE5-35E0ED6F651D Museu de Zoologia, Universidade de São Paulo, São Paulo, Brazil mvfukuda@usp.br Author Paulo Cesar de Paiva BF64FCF1-66E5-40C3-93BB-9B40E3A9FD79 Programa dePós-graduação em Biodiversidade e Biologia Evolutiva, Instituto de Biologia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil paulo.paiva@gmail.com text European Journal of Taxonomy 2024 2024-03-04 925 1 46 66 https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2449/10859 journal article 10.5852/ejt.2024.925.2449 2118-9773 10803984 D89946CC-B736-4295-9433-52231D525E41 Genus Brevicirrosyllis San Martín, López & Aguado, 2009 Type species Pionosyllis weismanni Langerhans, 1879 , designated by San Martín et al. (2009) . Remarks San Martín et al. (2009) redefined the genus Pionosyllis Malmgren, 1867 and proposed several new genera, including Brevicirrosyllis , based on distinct groups previously allocated under the former genus. In the key to the identification of Brevicirrosyllis presented in that study, however, information regarding the morphology of the dorsal simple chaetae was confounded between Brevicirrosyllis mayteae ( San Martín & Hutchings, 2006 ) and B . ancori ( San Martín & Hutchings, 2006 ) : different from the key ( San Martín et al. 2009: 1469 ), the former was described as having pin-shaped dorsal simple chaetae, while the latter was described as having truncate ones ( Table 1 ). Here, we present an updated identification key for all Brevicirrosyllis , including the new species described in this study. Identification key to species of Brevicirrosyllis San Martín, López & Aguado, 2009 Adapted from San Martín et al. (2009) . 1. Compound chaetae heterogomph ................................ B. gorringensis ( Hartmann-Schröder, 1977 ) . – Compound chaetae hemigomph ....................................................................................................... 2 2. Dorsal cirri with fibrillar inclusions .................................................................................................. 3 – Dorsal cirri without fibrillar inclusions ............................................................................................. 4 3. Dorsal cirri on chaetiger 2 present ................................................ B. weismanni ( Langerhans, 1879 ) – Dorsal cirri on chaetiger 2 absent .................................. B. mariae ( San Martín & Hutchings, 2006 ) 4. Dorsal simple chaeta pin-shaped ................................. B. mayteae ( San Martín & Hutchings, 2006 ) – Dorsal simple chaeta truncated ......................................................................................................... 5 5. Palps longer than prostomium; median antenna twice length of palps; dorsal peristomial cirri about same length of body width; parapodial glands present ....................................................................... ......................................................................................... B. ancori ( San Martín & Hutchings, 2006 ) – Palps with same length of prostomium; median antenna more than four times as long as palps; dorsal peristomial cirri longer than body width; parapodial glands absent ................ B. paulolanai sp. nov.