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Abnormal embryos of sharpnose sharks, Rhizoprionodon porosus and Rhizoprionodon lalandii (Elasmobranchii: Carcharhinidae), from Brazilian coast, western South Atlantic

Published online by Cambridge University Press:  22 May 2014

Camila Mayumi Hirata dos Santos  and
Otto Bismarck Fazzano Gadig
Camila Mayumi Hirata dos Santos*
Affiliation:
UNESP, Campus de Rio Claro, Rua 24A n°1515, 13506-900, Rio Claro, São Paulo, Brazil Laboratório de Pesquisa de Elasmobrânquios, UNESP, Campus Experimental do Litoral Paulista, Praça Infante Dom Henrique s/n, 11330-900, São Vicente, São Paulo, Brazil
Otto Bismarck Fazzano Gadig
Affiliation:
Laboratório de Pesquisa de Elasmobrânquios, UNESP, Campus Experimental do Litoral Paulista, Praça Infante Dom Henrique s/n, 11330-900, São Vicente, São Paulo, Brazil
*
Correspondence should be addressed to: C.M.H. Santos, Laboratório de Pesquisa de Elasmobrânquios, UNESP, Campus Experimental do Litoral Paulista, Praça Infante Dom Henrique s/n, 11330-900, São Vicente, São Paulo, Brasil email: camilamhs@hotmail.com
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Abstract

This study presents the second worldwide report on abnormal embryos of the sharpnose sharks, Rhizoprionodon, based on the two species (Rhizoprionodon porosus and Rhizoprionodon lalandii) occurring on the Brazilian coast. For R. porosus two conjoined twin embryos showing complete duplication of the vertebral column, viscera and several external structures (head, first and second dorsal fins, pectoral fins), and scoliosis in both axis at the pelvic fin level are reported. The three embryos of R. lalandii exhibited numerous lordosis and kyphosis along the entire vertebral column. The possible relationship between anomalies and the human major threats to sharks is discussed based on previous reproductive, genetic and ecotoxicological studies on R. lalandii for southern Brazil.

Keywords

anomalyanatomymorphologyelasmobranchconservation
Type
Research Article
Information
Marine Biodiversity Records , Volume 7 , 2014 , e55
Copyright
Copyright © Marine Biological Association of the United Kingdom 2014 

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