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Development of the suprarostral plate of Pipoid Frogs

✍ Scribed by Rafael O. De Sá; Charles C. Swart

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
596 KB
Volume
240
Category
Article
ISSN
0362-2525

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✦ Synopsis

The rostral region of nonpipoid tadpoles has two sets of cartilages, the cornua trabeculae and the suprarostral cartilages, whereas the rostral region in pipoid larvae is occupied by a single and continuous cartilage, the suprarostral plate. The homology of this region in pipoid and nonpipoids tadpoles has been controversial. We examined the early formation and development of the suprarostral plate using serially cross-sectioned specimens of Rhinophrynus, Xenopus, and Hymenochirus. We conclude that the cartilaginous structures present in the rostral area of pipoid and nonpipoid larvae are homologous. Furthermore, we found two different developmental patterns among pipoid larvae. The chondrocranium of Hymenochirus boettgeri is described and illustrated to understand its developmental pattern and because of its uniqueness among pipoid chondrocrania.

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