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Paralacydonia (Polychaeta: Paralacydoniidae) off Rio de Janeiro, Brazil

Published online by Cambridge University Press:  01 November 2011

A.E. Rizzo  and
J.R.L. Oliveira
A.E. Rizzo*
Affiliation:
Universidade do Estado do Rio de Janeiro, Instituto de Biologia, Departamento de Zoologia, Rua São Francisco Xavier 524, 20511–900, Maracanã, Rio de Janeiro, Brazil
J.R.L. Oliveira
Affiliation:
Universidade do Estado do Rio de Janeiro, Instituto de Biologia, Departamento de Zoologia, Rua São Francisco Xavier 524, 20511–900, Maracanã, Rio de Janeiro, Brazil
*
Correspondence should be addressed to: A.E. Rizzo, Universidade do Estado do Rio de Janeiro, Instituto de Biologia, Departamento de Zoologia, Rua São Francisco Xavier 524, 20511–900, Maracanã, Rio de Janeiro, Brazil email: aerizzo@hotmail.com
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Abstract

Paralacydoniids are a small group of burrowing polychaetes, with adults reaching ~10 cm in length. The prostomium is subconical, distally bearing two pairs of frontal appendages; the pharynx is eversible and distally papillate and jaws are absent. The parapodia are biramous, except the first segment which is uniramous. Both rami are widely separated, with long, flattened pre- and post-chaetal lobes, interramal cilia and short digitiform dorsal and ventral cirri. The notochaetae are simple, and the neurochaetae are compound spiniger. The posterior end bears a pair of long cirri. A single species, Paralacydonia paradoxa, has been considered valid. Two other named taxa, Paralacydonia weberi and Paralacydonia mortenseni, are usually considered synonyms of P. paradoxa, although a revision has not been undertaken. Paralacydoniids were collected during the Habitats Project–Campos Basin Environmental Heterogeneity coordinated by CENPES/PETROBRAS, of which the first campaign was held in June–July 2008 and the second campaign in January–February 2009. In all, 289 specimens were observed under the light microscope, and some by means of scanning electron microscopy. The paralacydoniids, collected at depths between 380 and 2514 m, were 0.4 to 19 mm in total length, the largest with 74 chaetigers; the size is related to the number of chaetigers.

Keywords

Paralacydonia paradoxacontinental shelfCampos BasinHabitats/Petrobras
Type
Research Article
Information
Marine Biodiversity Records , Volume 4 , December 2011 , e84
Copyright
Copyright © Marine Biological Association of the United Kingdom 2011

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References

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