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Embryonic development of the myobatrachine frogs Geocrinia laevis, Geocrinia victoriana, and their natural hybrids

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The Australian frogs Geocrinia laevis and Geocrinia victoriana undergo prolonged embryonic development inside their egg capsules, before hatching as advanced tadpoles. Despite the presence of large amounts of yolk, the course of development follows the typical anuran pattern rather closely, and is essentially identical in the two species and their natural hybrids. We present a modification of Gosner's (1960) staging table, using mainly changes in the eye and the mouthparts to define stages (20 to 26) in a phase of development, when the Gosner table is not applicable to myobatrachine frogs.

Affiliations: 1: Institut für Zoologie, Universität Wien, Althanstr. 14, A-1090 Wien, Austria


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