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JOURNAL OF PLANKTON RESEARCH | VOLUME 20 | NUMBER 6 | PAGES 1119-1130 | 1998
© Oxford University Press

research-article

Acartia bifilosa (Copepoda: Calanoida): a clarification of the species and its varieties inermis and intermedia

A.G. Hirst1 and E. Castro-Longoria

Department of Oceanography, University of Southampton Southampton Oceanography Centre, Empress Dock, Southampton SO14 3ZH, UK 1George Deacon Division, Southampton Oceanography Centre Empress Dock, Southampton SO14 3ZH, UK

Received on September 27, 1997; accepted on January 21, 1998 Adults of the calanoid copepod Acartia bifilosa and the varieties inermis and intermedia are examined and described. This study brings to light discrepancies in the available keys to all these forms. Individuals previously reported and also deposited in museum collections as A.bifilosa var. inermis and var. intermedia are shown to be similar to A.bifilosa with respect to characteristics previously used for classification. Acartia bifilosa and its varieties were shown to possess setules on the dorsal side of female and male urosomes, although there was great variation in the size and position of these. The fifth legs (P5) of adult males and females were very similar in all individuals examined, regardless of how they were previously classified, although the original descriptions are generally inadequate or misleading. These results bring into doubt the arguments used by Rose (1929) to report A.bifilosa var. inermis. A single unified species, A.bifilosa (Giesbrecht), is suggested here, with some of the variation in its form being detailed. We believe errors may have occurred because of the angle from which features were previously examined, and because some of the features could be missed using light microscopy.


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