scholarly journals Comparative cranial ontogeny ofTapirus(Mammalia: Perissodactyla: Tapiridae)

2017 ◽  
Vol 231 (5) ◽  
pp. 665-682 ◽  
Author(s):  
S. Rocio Moyano ◽  
Norberto P. Giannini
Keyword(s):  
Cranial Ontogeny

Evolution of Cranial Ontogeny in South American Canids (Carnivora: Canidae)

2021 ◽  
Author(s):  
Valentina Segura ◽  
Guillermo H. Cassini ◽  
Francisco J. Prevosti
Keyword(s):  
South American ◽  
Cranial Ontogeny

scholarly journals Ngwevu intloko: a new early sauropodomorph dinosaur from the Lower Jurassic Elliot Formation of South Africa and comments on cranial ontogeny in Massospondylus carinatus

PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e7240 ◽  
Author(s):  
Kimberley E.J. Chapelle ◽  
Paul M. Barrett ◽  
Jennifer Botha ◽  
Jonah N. Choiniere
Keyword(s):  
South Africa ◽  
New Species ◽  
Sexual Dimorphism ◽  
New Genus ◽  
Lower Jurassic ◽  
Early Jurassic ◽  
Adult Size ◽  
Minimum Age ◽  
Cranial Ontogeny ◽  
Morphological Differences

Our knowledge of Early Jurassic palaeobiodiversity in the upper Elliot Formation of South Africa has increased markedly in recent years with the discovery of new fossils, re-assessments of previously collected material and a better understanding of Stormberg Group stratigraphy. Here, Ngwevu intloko, a new genus of upper Elliot basal sauropodomorph is named on the basis of a complete skull and partial skeleton (BP/1/4779) previously assigned to Massospondylus carinatus. It can be distinguished from all other basal sauropodomorphs by a combination of 16 cranial and six postcranial characters. The new species is compared to a small ontogenetic series of M. carinatus as well as to a range of closely related taxa. Taphonomic deformation, sexual dimorphism and ontogeny are rejected as possible explanations for the morphological differences present between BP/1/4779 and other taxa. Osteohistological examination reveals that BP/1/4779 had nearly reached adult size at the time of its death at a minimum age of 10 years.

Cranial ontogeny of otariid seals

2004 ◽  
Vol 2 (1) ◽  
pp. 83-110 ◽  
Author(s):  
Sylvia Brunner ◽  
Michael M. Bryden ◽  
Peter D. Shaughnessy
Keyword(s):  
Cranial Ontogeny

scholarly journals A new ornithurine from the Early Cretaceous of China sheds light on the evolution of early ecological and cranial diversity in birds

PeerJ ◽  
2016 ◽  
Vol 4 ◽  
pp. e1765 ◽  
Author(s):  
Jiandong Huang ◽  
Xia Wang ◽  
Yuanchao Hu ◽  
Jia Liu ◽  
Jennifer A. Peteya ◽  
...  
Keyword(s):  
New Species ◽  
Early Cretaceous ◽  
Late Cretaceous ◽  
Late Jurassic ◽  
Northeastern China ◽  
Avian Ecology ◽  
Developmental Shift ◽  
Cranial Ontogeny ◽  
Close Relatives

Despite the increasing number of exceptional feathered fossils discovered in the Late Jurassic and Cretaceous of northeastern China, representatives of Ornithurae, a clade that includes comparatively-close relatives of crown clade Aves (extant birds) and that clade, are still comparatively rare. Here, we report a new ornithurine speciesChangzuiornis ahgmifrom the Early Cretaceous Jiufotang Formation. The new species shows an extremely elongate rostrum so far unknown in basal ornithurines and changes our understanding of the evolution of aspects of extant avian ecology and cranial evolution. Most of this elongate rostrum inChangzuiornis ahgmiis made up of maxilla, a characteristic not present in the avian crown clade in which most of the rostrum and nearly the entire facial margin is made up by premaxilla. The only other avialans known to exhibit an elongate rostrum with the facial margin comprised primarily of maxilla are derived ornithurines previously placed phylogenetically as among the closest outgroups to the avian crown clade as well as one derived enantiornithine clade. We find that, consistent with a proposed developmental shift in cranial ontogeny late in avialan evolution, that this elongate rostrum is achieved through elongation of the maxilla while the premaxilla remains only a small part of rostral length. Thus, only in Late Cretaceous ornithurine taxa does the premaxilla begin to play a larger role. The rostral and postcranial proportions ofChangzuiornissuggest an ecology not previously reported in Ornithurae; the only other species with an elongate rostrum are two marine Late Cretacous taxa interpreted as showing a derived picivorous diet.

Cranial ontogeny in the direct-developing frog,Eleutherodactylus coqui (anura: Leptodactylidae), analyzed using whole-mount immunohistochemistry

1992 ◽  
Vol 211 (1) ◽  
pp. 95-118 ◽  
Author(s):  
James Hanken ◽  
Michael W. Klymkowsky ◽  
Cliff H. Summers ◽  
Daniel W. Seufert ◽  
Nicole Ingebrigtsen
Keyword(s):  
Eleutherodactylus Coqui ◽  
Whole Mount ◽  
Cranial Ontogeny

scholarly journals Cranial Ontogeny of the Early Triassic Basal CynodontGalesaurus planiceps

2016 ◽  
Vol 300 (2) ◽  
pp. 353-381 ◽  
Author(s):  
Sandra C. Jasinoski ◽  
Fernando Abdala
Keyword(s):  
Early Triassic ◽  
Cranial Ontogeny
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