The structure and development of the skull of Costa Rican plethodontid salamanders (Amphibia : Urodela)

Citation
J. Ehmcke et G. Clemen, The structure and development of the skull of Costa Rican plethodontid salamanders (Amphibia : Urodela), ANN ANATOMY, 182(6), 2000, pp. 537-547
Citations number
30
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Experimental Biology
Journal title
ANNALS OF ANATOMY-ANATOMISCHER ANZEIGER
ISSN journal
0940-9602 → ACNP
Volume
182
Issue
6
Year of publication
2000
Pages
537 - 547
Database
ISI
SICI code
0940-9602(200011)182:6<537:TSADOT>2.0.ZU;2-9
Abstract
We describe the structure of the skulls of the Costa Rican plethodontid sal amanders Bolitoglossa subpalmata, Oedipina uniformis and Nototriton abscond ens, and the characteristic sequences of development and ossification of th e bony elements resulting from direct development using mainly cleared and stained specimens. Significant differences between the species studied are observed. N. abscondens possesses the broadest premaxillary pars dentalis a nd O. uniformis the narrowest one. The premaxillary dorsal processes are fu sed over their rostral third only in B. subpalmata; over half their extenti on in N.abscondens and almost completely in O. uniformis. A prefrontal is a lways present in N. abscondens; it is hidden underneath the nasal or missin g in B.subpalmata, and it is always absent in O. uniformis. The skull bones , with the exception of the orbitosphenoid, develop and ossify sequentially from caudal to rostral in these directly developing species. A more massiv e pars dentalis of a generally narrower premaxillary are found as typical c haracters in males.