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Ultrastructure of Chromatophores From the Fiddler Crabs Uca Rapax (Smith) and Uca Ur Ugua Yensis (Nobili) (Decapoda, Brachyura)

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image of Crustaceana

L'ultrastructure des chromatophores monochromatiques noirs et rouges de l'épiderme tégumentaire et des membranes arthrodiales chez les crabes Uca rapax (Smith) et Uca uruguayensis (Nobili) a été étudiée par moyen de la microscopie électronique de transmission. Des granules sphériques proéminents du pigment, un système moyennement développé de cisternes du reticulum endoplasmique granulaire, microtubules, vésicules, ribosomes libres et polysomes ont été révélés. L'ultrastructure de ces chromatophores diffère, primordialement, de celle des chromatophores des Natantia quant au type (granulaire cf. lisse), au degré de développement du reticulum endoplasmique et aussi en ce qui concerne le nombre réduit de microtubules.

Affiliations: 1: Departamento de Fisiologia, Instituto de Biociências, Caixa Postal 11461, Universidade de São Paulo, 05421 São Paulo, Brazil


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