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DEVELOPMENT OF THE ANTERIOR PART OF SKULL IN THE ANURA
Authors: Královec Karel | Roček Zbyněk
Year: 2007
Type of publication: článek ve sborníku
Name of source: Journal of Morphology
Publisher name: Wiley-Blackwell
Page from-to: 1041
Titles:
Language Name Abstract Keywords
cze Ontogenetický vývoj rostrální části lebky u žab Ontogenetický vývoj rostrální části lebky u žab
eng DEVELOPMENT OF THE ANTERIOR PART OF SKULL IN THE ANURA Two morphologically different schemes of the anterior part of the skull were recognized in the anuran larvae. The first, which occurs in the Pipidae, consists of the horizontal internasal plate which also serves as the larval upper jaw; its lower jaw consists of two elongated Meckel's cartilages interconnected by two hypomandibulars and one basimandibular. The second, which is typical for non-pipoid anuran tadpoles, consists of a pair of trabecular horns terminated by suprarostral cartilages. Its lower jaw consists of a pair of infrarostrals, sometimes interconnected by the basimandibular. Although the second type seems to be more conservative in that it maintains two separate trabeculae, it is more deviated from the ancestral temnospondyl scheme by its modified larval jaw apparatus. In contrast, the pipid larval type is basically the same as in ancestral temnospondyls. During metamorphosis, both types undergo profound transformations in which some parts disappear, some arise new, and some are translocated and become parts of other structures. Therefore the question arises which parts of these two types are homologous. To answer this question, we followed the development in Discoglossus, a representative of primitive non-pipoid anurans, and Xenopus (completed by data gained from selected stages of Pipa), as representatives of contemporary pipids. Here we present some preliminary results based on histological analysis and computer-assisted 3D reconstructions. This made it possible to compare development of homologous parts from the earliest mesenchymal primordia till the structures of adults. An attempt is made to explain morphological differences of homologous parts. development; skull; anura

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