The morphology of the foregut of larvae and postlarva of Sesarma curacaoense De Man, 1892: a species with facultative lecithotrophy during larval development

Acta Amazonica

Marlon Aguiar Melo²  Fernando Abrunhosa¹  Iracilda Sampaio¹ 

[1] ,Universidade Federal do CearáFortaleza CE ,Brasil

关键词: Morphology;    lecithotrophy;    foregut;    larval development;    grapsid crab;    Morfologia;    lecitotrofia;    estômago;    desenvolvimento larval;    caranguejo grapsídeo;   

DOI  :  10.1590/S0044-59672006000300014

来源: SciELO

【 摘 要 】

Previous study on the resistance of larvae of Sesarma curacaoense submitted to starvation has revealed a facultative lecithotrophy during zoeal stages, but megalopa and first juvenile stages are exclusively feeding stages. In the present study, the gross morphology and fine structure of the foregut of S. curacaoense were investigated during larval, megalopa and first juvenile stages. The foregut of the zoea I show specific setae and a filter press apparently functional. The foregut undergoes changes in the zoea II (last larval stage) with increment of setae number, mainly on the cardiopyloric valve and complexity of the filter press. After metamorphosis to megalopa stage the foregut become rather complex, with a gastric mill supporting a medial and two lateral teeth well-developed. The foregut of the first juvenile is more specialized compared to the previous stage, showing similar characteristics of the decapod adults. These results provide further evidence of facultative lecithotrophic development in the larvae of S. curacaoense.

【 授权许可】

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