Please use this identifier to cite or link to this item:
metadata.dc.type: Artigo de Periódico
Issue Date: Aug-2011
metadata.dc.creator: ARRUDA, Danielle Cristina Bulhões
ABRUNHOSA, Fernando Araujo
Title: Redescription of megalopa and juvenile development of Pachygrapsus gracilis (Decapoda: Grapsidae) from the Amazon region, reared in the laboratory
Citation: ARRUDA, Danielle C. B; ABRUNHOSA, Fernando A. Redescription of megalopa and juvenile development of Pachygrapsus gracilis (Decapoda: Grapsidae) from the Amazon region, reared in the laboratory. Zoologia (Curitiba), Curitiba, v. 28, n. 4, p. 465-478, ago. 2011. Disponível em <>. Acesso em: 06 maio 2013. <>.
Abstract: This present study re-describes the megalopa stage and provides detailed morphological descriptions and main growth changes observed in stages I through VII of the juvenile instars of the dark shore crab Pachygrapsus gracilis (Saussure, 1858), from the Amazon region. The specimens in this study were reared in the laboratory and the megalopae were collected at Ajuruteua beach in northeastern Pará, Brazil. Previous studies had described the megalopa of P. gracilis from Mexican waters, as well as those of Pachygrapsus transversus (Gibbes, 1850) and Pachygrapsus marmoratus (Fabricius, 1787). A comparison between the Mexican and Amazonian populations of P. gracilis revealed significant morphological differences. The main difference is the presence of 3 elongated setae on the 5th pereiopods of individuals of the Amazonian population. The setal number and their arrangement in the appendages also differed. In P. gracilis, the male and female genital openings are observed from the juvenile instar III, whereas differentiation in male pleopods is observed only in juvenile instar V. In females, the pleopods undergo rapid differentiation during juvenile instar VI. These morphological comparisons and other observations on development are briefly compared and discussed with reports for other species.
Keywords: Amazônia brasileira
Estágio transitório
Morfologia larval
Praia de Ajuruteua - PA
Bragança - PA
Pará - Estado
ISSN: 1984-4670
metadata.dc.rights: Acesso Aberto
Appears in Collections:Artigos Científicos - FBIO/IECOS

Files in This Item:
File Description SizeFormat 
Artigo_RedescriptionMegalopaJuvenile.pdf3,05 MBAdobe PDFView/Open

This item is licensed under a Creative Commons License Creative Commons