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JOURNAL OF PLANKTON RESEARCH | VOLUME 20 | NUMBER 1 | PAGES 61-84 | 1998
© Oxford University Press

research-article

First zoeal stages of four Sesarma species from Panama, with identification keys and remarks on the American Sesarminae (Crustacea: Brachyura: Grapsidae)

Christoph D. Schubart1,3 and José A. Cuesta2

1Fakultät für Biologie I: VHF Universitat Bielefeld Postfach 100131, D-33501 2Departmento de Ecología, Facultad de Biología, Universidad de Sevilla Apdo. 1095, E-41080 Sevilla, Spain

Received on April 15, 1997; accepted on September 2, 1997

The first zoeal stage of the grapsid crabs Sesarma aequatoriale Ortmann, 1894, S.rubinofforum Abele, 1973, S.rhizophorae Rathbun, 1906, S.curacaoense de Man, 1892, Armases ricordi, (H. Milne Edwards, 1853), A.rubripes (Rathbun, 1897) and Cyclograpsus integer H. Mime Edwards, 1837 was obtained from laboratory-hatched material in Panama. Zoeae I of the four Sesarma species are described and illustrated. Larvae of the other three species were used to complete or correct the chaetotaxy of the original descriptions. Larval features are compared among these species and with those of other American Sesarminae. In order to facilitate the study of plankton-collected material, two keys for identification of the known zoea I of sesarmine crabs from Panama are provided: one for Caribbean waters and the other for the Pacific coast. Remarks are given on the generic relationships within the American Sesarminae, the taxonomic position of the genera Cyclograpsus and Chasmagnathus, and the relevance of the reduction of larval stages.

3Present address: Department of Biology, University of Southwestern Louisiana PO Box 42451, Lafayette, LA 70504, USA


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