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Development of the tectum in Gymnophiones, with comparison to other amphibians

✍ Scribed by Andrea Schmidt; Marvalee H. Wake

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
727 KB
Volume
236
Category
Article
ISSN
0362-2525

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✦ Synopsis

Tectal development in a number of caecilian (Gymnophiona: Amphibia) species was examined and compared with that in frogs and salamanders. The caecilian optic tectum develops along the same rostrocaudal and lateromedial gradients as those of frogs and salamanders. However, differences exist in the time course of development. Our data suggest that, as in salamanders, simplification of morphological complexity in caecilians is due to a retardation or loss of late developmental stages. Differences in the time course of development (heterochrony) among different caecilian species are correlated with phylogenetic history as well as with variation in life histories. The most pronounced differences in development occur between the directly developing Hypogeophis rostratus and all other species examined. In this species, the increase in the degree of morphological complexity is greatly accelerated.

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