Development of the chondrocranium of two caiman species, Caiman latirostris and Caiman yacare

Little is known about the embryonic development and variation of the chondrocranium in Crocodylia and there are no works on any Caiman species. Due to the importance of cranial features in the systematics of this clade, investigating the development of the skull in embryonic stages is essential. In...

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Detalles Bibliográficos
Autor principal: Fernández Blanco, María Victoria
Formato: Articulo
Lenguaje:Inglés
Publicado: 2019
Materias:
Biología
Zoología
Embryonic stages
Laryngeal cartilages
Morphological variation
Neurocranium
Ontogeny
Skull
Splanchnocranium
Trachea
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/127165
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-127165
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Biología
Zoología
Embryonic stages
Laryngeal cartilages
Morphological variation
Neurocranium
Ontogeny
Skull
Splanchnocranium
Trachea
spellingShingle Biología
Zoología
Embryonic stages
Laryngeal cartilages
Morphological variation
Neurocranium
Ontogeny
Skull
Splanchnocranium
Trachea
Fernández Blanco, María Victoria
Development of the chondrocranium of two caiman species, Caiman latirostris and Caiman yacare
topic_facet Biología
Zoología
Embryonic stages
Laryngeal cartilages
Morphological variation
Neurocranium
Ontogeny
Skull
Splanchnocranium
Trachea
description Little is known about the embryonic development and variation of the chondrocranium in Crocodylia and there are no works on any Caiman species. Due to the importance of cranial features in the systematics of this clade, investigating the development of the skull in embryonic stages is essential. In this study, we present for the first time the development of the cartilaginous skull of two extant Caiman species. Anatomical descriptions of the embryonic chondrocranium of Caiman latirostris and Caiman yacare were made, paying special attention to their inter- and intraspecific variation. For this purpose, pre-hatching ontogenetic cranial series of these two caiman species were prepared with a double staining and diaphanization technique. The main differences with other crocodylian species were observed in the palatoquadrate, and interspecific variation within the genus was recorded in the hyobranchial apparatus and larynx. Some characters may be distinctive of Caiman (posterior and ventral surface of the otic process of the palatoquadrate articulated with the dorsal process of the columella auris, and otic process articulated with the lateral wall of the auditory capsule), Alligatoridae (presence of an epiphanial foramen) or C. latirostris and C. yacare (Corpus hyoidei with different number and position of foramina and different shapes of its anterior contour and anterior and posterior notch, different degrees of broadening of the distal end of the Cornu branchiale I, and presence/absence of a notch in the posteroventral surface of the cricoid). Homologies of the elements belonging to the hyobranchial apparatus could not be confirmed. As in other tetrapods the trachea consists of incomplete cartilaginous rings. Morphological changes and dissimilarities found in this study are useful as a context to start studying phylogenetic constraints. Moreover, in a heterochronic context, variations may be involved.
format Articulo
Articulo
author Fernández Blanco, María Victoria
author_facet Fernández Blanco, María Victoria
author_sort Fernández Blanco, María Victoria
title Development of the chondrocranium of two caiman species, Caiman latirostris and Caiman yacare
title_short Development of the chondrocranium of two caiman species, Caiman latirostris and Caiman yacare
title_full Development of the chondrocranium of two caiman species, Caiman latirostris and Caiman yacare
title_fullStr Development of the chondrocranium of two caiman species, Caiman latirostris and Caiman yacare
title_full_unstemmed Development of the chondrocranium of two caiman species, Caiman latirostris and Caiman yacare
title_sort development of the chondrocranium of two caiman species, caiman latirostris and caiman yacare
publishDate 2019
url http://sedici.unlp.edu.ar/handle/10915/127165
work_keys_str_mv AT fernandezblancomariavictoria developmentofthechondrocraniumoftwocaimanspeciescaimanlatirostrisandcaimanyacare
bdutipo_str Repositorios
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