heterobranchiata, a new genus and species of extratubular brooding sabellid (Polychaeta: Sabellidae) from São Paulo, Brazil
de M. Nogueira a1, Eduardo
López a2 and Maíra C.S.
a1 Departamento de Zoologia, Instituto de Biociências, Universidade de São Paulo (IB–USP), Rua do Matão, travessa 14, n. 101, 05508-900, São Paulo, SP, Brazil, e-mail: firstname.lastname@example.org
a2 Departamento de Biología, Unidad de Zoología, Universidad Autónoma de Madrid, Cantoblanco, 28049, Madrid, Spain, e-mail: email@example.com
A new genus and species of sabellid polychaete from an organically enriched beach in São Sebastião, State of São Paulo, is described. Kirkia
heterobranchiata is unique among sabellids for brooding the embryos on the dorsalmost pair of radioles, which exhibits several modifications for this purpose, rather than on ventral radioles. Morphologically, K.
heterobranchiata is most closely related to Perkinsiana
riwo, here referred to as the new genus, as suggested by phylogenetic analysis. The new genus is characterized by the shape of the lips (dorsal lips roughly triangular, broader than long; ventral lips lower, ventrally fused and distally rounded), by the absence of both radiolar and pinnular appendages, by having uncini with very short handles in both the thorax and abdomen, and by the ability to brood embryos in cocoons attached to the branchial crown.
(Received February 4 2003)
(Accepted May 24 2004)