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Morphology of juvenile phase of Achelous spinimanus (Latreille, 1819) (Crustacea, Decapoda, Portunidae) reared in laboratory

Published online by Cambridge University Press:  11 May 2015

Eduardo Antonio Bolla Júnior  and
Maria Lucia Negreiros Fransozo
Eduardo Antonio Bolla Júnior
Affiliation:
Instituto Federal de São Paulo, Av. Professor Celso Ferreira da Silva n. 1333, Jardim Europa, 18707-150 Avaré, São Paulo, Brazil NEBECC (Group of studies on crustacean biology, ecology and culture), Department of Zoology, Biosciences Institute, São Paulo State University, 18618-970 Botucatu, São Paulo, Brazil
Maria Lucia Negreiros Fransozo*
Affiliation:
NEBECC (Group of studies on crustacean biology, ecology and culture), Department of Zoology, Biosciences Institute, São Paulo State University, 18618-970 Botucatu, São Paulo, Brazil
*
Correspondence should be addressed to:M.L. Negreiros Fransozo, NEBECC (Group of studies on crustacean biology, ecology and culture), Department of Zoology, Biosciences Institute, São Paulo State University, 18618-970 Botucatu, São Paulo, Brazil email: mlnf@ibb.unesp.br
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Abstract

The swimming crab Achelous spinimanus is an important fishery component of several countries in the Western Atlantic; therefore, knowledge of the different phases of its life cycle is essential for good management of this resource. The juvenile development of A. spinimanus was investigated in the laboratory, from megalopae captured in neuston samples at Ubatuba, São Paulo, Brazil (23°26′S 46°09′W), during the summer months of 2005–2007. Rearing was performed in a constant temperature (25 ± 1°C), filtered seawater from the collection location (35 psu) and natural photoperiod. We obtained nine stages of the juvenile phase. All the morphological characters that allow the recognition of the first juvenile stage were drawn and described, as well as the main alterations that occur in the following stages. The sexual differentiation based on the number of pleopods becomes apparent from the third stage on. Some important characters in the identification of the species at the juvenile phase are the number of segments on the exopod of antennule, on the antennal flagellum and on the palp of mandible, beyond the absence of pleopods (even rudimentary) in the first stage.

Keywords

Swimming crabBrachyuradevelopmentpost-larvalimmature
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 96 , Issue 3 , May 2016 , pp. 615 - 631
Copyright
Copyright © Marine Biological Association of the United Kingdom 2015 

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