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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Developmental basis of limb homology in Pleurodiran turtles, and the identity of the hooked element in the chelonian tarsus

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Fabrezi, Marissa [1] ; Manzano, Adriana [2] ; Abdala, Virginia [3] ; Zaher, Hussam [4]
Total Authors: 4
[1] Univ Nacl Salta, Inst Bio Geociencias, Museo Ciencias Nat, RA-4400 Salta - Argentina
[2] CONICET UADER Matteri & Espana 3105, Diamante, Entre Rios - Argentina
[3] UNT, Inst Herpetol Fdn Miguel Lillo, RA-4000 San Miguel De Tucuman, Tucuman - Argentina
[4] Univ Sao Paulo, Museu Zool, BR-04263000 Sao Paulo - Brazil
Total Affiliations: 4
Document type: Journal article
Source: ZOOLOGICAL JOURNAL OF THE LINNEAN SOCIETY; v. 155, n. 4, p. 845-866, APR 2009.
Web of Science Citations: 16

Although Pleurodiran turtles represent an important component of extant turtle radiation, our knowledge of the development and homology of limb bones in turtles rests mostly upon observations made on derived members of the Cryptodiran clade. Herein, we describe limb development in three pleurodirans: Podocnemis unifilis Troschel, 1848, Podocnemis sextuberculata Cornalia, 1849 and Phrynops hilarii (Dumeril and Bibron, 1835), in an effort to contribute to filling this anatomical gap. For earlier stages of limb development, we described the Y-shaped condensation that gave rise to the zeugopodial cartilages, and differentiation of the primary axis/digital arch that reveals the invariant pattern common to tetrapods. There are up to four central cartilaginous foci in the carpus, and the proximal tarsale is formed by the fusion of the fibulare, intermedium, and centrale 4. Digital development is similar for the five digits. Changes in toe V occur predominantly in the distal tarsale 5. Ontogenetic reduction of phalanges is observed in toe V of Podocnemis. Based on these results, we suggest that the hooked element present in the chelonian tarsus, and traditionally recognized as a modified fifth metatarsale, is actually the fifth distal tarsale. Additionally, our data on limb development of pleurodiran turtles supply more taxonomically comprehensive information to interpret limb configuration within the chelonian clade. (C) 2009 The Linnean Society of London, Zoological Journal of the Linnean Society, 2009, 155, 845-866. (AU)

FAPESP's process: 02/13602-4 - Evolution of the southeastern Brazilian reptile fauna from Cretaceous: paleontology, phylogeny and biogeography
Grantee:Hussam El Dine Zaher
Support type: BIOTA-FAPESP Program - Thematic Grants