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image of Crustaceana

The occurrence of a pair of conjoined twins among the newly born juveniles of a female of Aegla abtao from the Cruces River (Valdivia Province, Chile) is reported. The twinned juveniles lived for 10 days in an aquarium. They were joined together by their dorsum. One of them, the carrier, was completely developed and a little larger than the other one, which had underdeveloped pereiopods. The occurrence of conjoined twins in Aegla is an unusual phenomenon, since the eggs of crustaceans have determinate cleavage, and are, therefore, currently recognized as unable to produce Siamese twins if the first blastomeres become separated and develop in isolation.

La présence d'une paire de jumeaux siamois parmi les juvéniles nouvellement nés d'une femelle de Aegla abtao est ici rapportée de la rivière Cruces (Province de Valdivia, Chili). Les jumeaux ont vécu dix jours dans un aquarium à l'Institut de Zoologie de l'Université Austral du Chili à Valdivia. Ils étaient unis par le dos. L'un d'eux, considéré comme le porteur, était complètement développé et un peu plus grand que l'autre dont les péréiopodes n'étaient pas complètement développés. La présence de jumeaux siamois chez les Aegla est un phénomène inhabituel car les oeufs des Crustacés ont une segmentation déterminée et sont donc incapables de produire des jumeaux siamois dès lors que les premiers blastomères sont séparés.

Affiliations: 1: Instituto de Zoología, Facultad de Ciencias, Universidad Austral de Chile, Casilla 567, Valdivia, Chile


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