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Sur La Morphologie Externe Des Larves De Pagurides. I. Catapaguroides Timidus (Roux)

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image of Crustaceana

The four larval stages (zoea I to zoea IV) of the Hermit Crab Catapaguroides timidus (Roux) are described. Detailed illustrations are given showing the changes which occur during development of each appendage. The mandibles and the following appendages back to, and including, the second maxillipeds undergo only slight modifications of form and size from the first to the last stage. Peraeopods 1 to 5 appear at stage II, the uropods at stage III (at the same time as the telson becomes differentiated from the sixth abdominal segment), and the pleopods at stage IV. Important changes in the form of the body and of the appendages occur at the moult from zoea IV to the post-larva or glaucothoe, which is morphologically much nearer to the final or adult form than to the zoeas. So far no complete descriptions, or detailed figures, of Pagurid larvae have been published; it is thus only possible to compare the development of a limited number of characters with those of other species.

Affiliations: 1: Laboratoire Arago, Banyuls-sur-Mer et Laboratoire de Zoologie du Muséum National d'Histoire Naturelle, Paris


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