A standardized series of embryonic stages for the emydid turtle Trachemys scripta

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Interspecific comparisons of embryological development in turtles have been confounded by differences in morphology, number of stages, and relative detail of information provided for stages. To mitigate this problem for the family Emydidae, the largest family of turtles, a 27-stage scheme is presented for Trachemys scripta. Because the earliest stages of development are comparable across all turtle taxa, only the latter portion of development (stages 12–26) is emphasized. Stages are defined on the basis of forelimb and claw morphological criteria described previously for Chelydra serpentina.

La comparaison interspécifique du développement embryonnaire chez les tortues est difficile à cause des différences dans la morphologie, dans le nombre de stades et dans la quantité d'informations disponibles sur chaque stade. Pour résoudre ce problème chez les Emydidae, la plus grande famille de tortues, j'ai conçu un schéma en 27 étapes, présenté ici pour Trachemys scripta. Comme les premières phases du développement sont semblables chez toutes les tortues, l'emphase est mise sur la dernière partie du développement (stades 12–26). Les stades sont définis en fonction de critères morphologiques concernant les pattes antérieures et les griffes, critères déjà utilisés pour Chelydra serpentina.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: August 1, 2002

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  • Published since 1929, this monthly journal reports on primary research contributed by respected international scientists in the broad field of zoology, including behaviour, biochemistry and physiology, developmental biology, ecology, genetics, morphology and ultrastructure, parasitology and pathology, and systematics and evolution. It also invites experts to submit review articles on topics of current interest.
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