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Novel sex-related characteristics of the longsnout seahorse Hippocampus reidi Ginsburg, 1933

This paper presents novel sex-related characteristics in Hippocampus reidi, expressed as a prominent and pigmented keel (males only), and by a row of dorsolateral spots mostly (97.4%) found in males. While the keel was found even in the smallest males sampled, the dorsolateral spots appear to be ass...

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Published in:Neotropical Ichthyology 2010, Vol.8 (2), p.373-378
Main Authors: Oliveira, Tacyana P. R(Universidade Federal da Paraíba CCEN Departamento de Sistemática e Ecologia), Castro, André L. C(Universidade Federal da Paraíba CCEN Departamento de Sistemática e Ecologia), Rosa, Ierecê L(Universidade Federal da Paraíba CCEN Departamento de Sistemática e Ecologia)
Format: Article
Language:English
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Summary:This paper presents novel sex-related characteristics in Hippocampus reidi, expressed as a prominent and pigmented keel (males only), and by a row of dorsolateral spots mostly (97.4%) found in males. While the keel was found even in the smallest males sampled, the dorsolateral spots appear to be associated with body size. Ex situ observations revealed that during courtship males highlighted both characters by turning pale their background body colour. Understanding such colour and behavioural patterns is relevant to increase our knowledge about sexual selection in a morphologically and biologically unique group of fishes. O presente trabalho descreve novos caracteres sexuais em Hippocampus reidi, expressos como uma quilha proeminente e pigmentada (machos apenas), e uma série de máculas dorsolaterais, encontradas principalmente (97,4%) em machos. Enquanto a ocorrência da quilha foi observada mesmo nos menores machos, a presença de máculas dorsolaterais parece estar associada ao tamanho do corpo. Observações ex situ mostraram que os machos realçam ambos os caracteres durante o comportamento de corte, ao tornar pálida a cor de base do corpo. Destaca-se a relevância da compreensão de tais padrões de colorido para o avanço no conhecimento relativo à seleção sexual em um grupo de peixes de morfologia e biologia singulares.
ISSN:1679-6225
1982-0224
1679-6225
DOI:10.1590/S1679-62252010000200017