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Kirkia heterobranchiata, a new genus and species of extratubular brooding sabellid (Polychaeta: Sabellidae) from São Paulo, Brazil

Published online by Cambridge University Press:  12 August 2004

João M. de M. Nogueira
Affiliation:
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: nogueira@ib.usp.br
Eduardo López
Affiliation:
Departamento de Biología, Unidad de Zoología, Universidad Autónoma de Madrid, Cantoblanco, 28049, Madrid, Spain, e-mail: eduardo.lopez@uam.es
Maíra C.S. Rossi
Affiliation:
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: nogueira@ib.usp.br

Abstract

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.

Type
Research Article
Copyright
2004 Marine Biological Association of the United Kingdom

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