Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/69064
Type: Artigo de periódico
Title: Hyperossification in Miniaturized Toadlets of the genus Brachycephalus (Amphibia: Anura: Brachycephalidae): Microscopic Structure and Macroscopic Patterns of Variation
Author: Clemente-Carvalho, RBG
Antoniazzi, MM
Jared, C
Haddad, CFB
Alves, ACR
Rocha, HS
Pereira, GR
Oliveira, DF
Lopes, RT
dos Reis, SF
Abstract: Species of the genus Brachycephalus, have a snout-vent length of less than 18 mm and are believed to have evolved through miniaturization. Brachycephalus ephippium, is particularly interesting; because its entire skull is hyperossified, and the presacral vertebrae and transverse processes are covered by a dorsal shield. We demonstrate in this paper that, at the macroscopic level, a completely hyperossified skull and dorsal shield occur only in B. ephippium, but not in B. ferruginus, B. izechsohni, B. pernix, B. pombali, B. brunneus, B. didactylus, and B. hermogenesi. An intermediate condition, in which the skull is hyperossified but a dorsal shield is absent, occurs in B. vertebralis, B. nodoterga, B. pitanga, and B. alipioi. The microscopic structure of hyperossification was examined in skulls of B. ephippium and B. pitanga, revealing a complex organization involving the presence of Sharpey fibers, which in humans are characteristic of periodontal connections. J. Morphol. 270:1285-1295, 2009. (C) 2009 Wiley-Liss, Inc.
Subject: miniaturization
skeletal morphology
Sharpey fibers
anura
skull morphology
Country: EUA
Editor: Wiley-liss
Rights: fechado
Identifier DOI: 10.1002/jmor.10755
Date Issue: 2009
Appears in Collections:Unicamp - Artigos e Outros Documentos

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