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Records of Oncaeidae (Copepoda) from the Gulf of Naples, with new records of three species of Triconia

Published online by Cambridge University Press:  20 August 2008

Iole Di Capua  and
Geoff A. Boxshall
Iole Di Capua*
Affiliation:
Stazione Zoologica A. Dohrn, Napoli, Italy
Geoff A. Boxshall
Affiliation:
Department of Zoology, The Natural History Museum, Cromwell Road, London SW7 5BD, UK
*
Correspondence should be addressed to: Iole Di Capua, Stazione Zoologica A. Dohrn, Napoli, Italy email: [email protected]
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Abstract

Three species of Oncaeidae, Triconia umerus, T. hawii and T. rufa are reported for the first time in the coastal waters of the Gulf of Naples, Tyrrhenian Sea, western Mediterranean Sea. They were found in meso-zooplankton samples collected in 2004 and were absent from samples collected prior to 2004. Specimens of Triconia umerus and T. hawii were compared with material collected from the type locality (the Red Sea). In order to facilitate identification, brief differential diagnoses, supported by scanning electron micrographs, are presented for the five species of Triconia that have small body size (450 to 600 μm) and co-occur in the upper 50 m of the water column of the Gulf of Naples. Surface ornamentation on the genital double-somite of the female is reported in T. minuta and T. hawii for the first time, but it is difficult to observe using light microscopy and we infer that it has probably been overlooked in these species hitherto. Possible explanations for the new discovery of these species in such a well-studied area are discussed and it is suggested that they represent relatively recent additions to the fauna. A key to the eleven species of Oncaeidae found in the Gulf of Naples is presented.

Keywords

OncaeidaeGulf of Naplesnew recordsTriconia spp.
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 88 , Issue 7 , November 2008 , pp. 1407 - 1415
Copyright
Copyright © Marine Biological Association of the United Kingdom 2008

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