Este trabalho foi realizado com a finalidade de descrever a anatomia externa das larvas de Clibanarius antillensis STIMPSON, 1859 criadas em laboratório. Os estádio de zoea e megalopa foram descritos. Fêmeas ovígeras foram coletadas em praias de S. Sebastião, São Paulo, Brasil. Os animais foram mantidos até a eclosão no laboratório em água do mar filtrada (salinidade 35 °/oo). As larvas foram criadas individualmente e alimentadas com nauplius de Artemia salina e a água foi mudada diariamente. Quatro ou cinco estádios de zoea e megalopa foram obtidos e o período de desenvolvimento foi completado em 39 dias (valor médio) à 18,8°C e 29 dias à 22°C. Comparações anatômicas foram feitas com larvas de outras espécies brasileiras particularmente com as do mesmo gênero. Observou- se estreita correlação entre C.antillensis e C. vittatus (Bosc, 1802).
Nous avons étudié le développement post-embryonnaire de Clibanarius sclopetarius (Herbst, 1796) provenant de São Sebastiâo, État de São Paulo, Brésil. Les larves ont été élevées au laboratoire dans un milieu dont la salinité était de 35°/°° et la témperature de 25 ± 2°C, avec Artemia salina comme nourriture. Nous avons observé quatre ou cinq stades zoé avant le stade mégalope. Tous ces stades sont dessinés et décrits de façon détaillée. D'autre part, des comparaisons morphologiques sont faites entre les données obtenues ici et celles déjà connues pour d'autres espèces appartenant au même genre. L'étude de la morphologie des larves est du plus grand intérêt pour l'établissement des rapports phylogénétiques parmi les Crustacés.
This study presents the morphological description and histochemical characterization of gill filaments of the Brazilian endemic bivalve Diplodon expansus, aiming to broaden the morphological knowledge of this species and establish the structure of the gills that will serve as control in histopathological studies applied to biomonitoring. The gill filaments are divided into three zones: frontal, intermediate, and abfrontal. In the center of the filament, haemocytes circulate through the haemolymph vessel, which is internally lined by endothelium. The frontal surface of the filament is covered with cilia, the lateral surface exhibits aquifer ducts, and the abfrontal surface presents ciliated and nonciliated cells. The epithelium of the filaments is composed of ciliated cells, nonciliated absorptive cells, and mucocytes. The support of the filaments is made by two specialized structures called skeletal rod and skeletal loop. Based on the obtained information, the gill filaments of the studied species present some peculiar characteristics that are not yet reported in detail in the literature such as the simultaneous presence of skeletal rod and skeletal loop. On the other hand, the general constitution of the filament is similar to that described for both marine and limnic bivalves and seems to be suitable for ecotoxicological studies.
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