List of transitional fossils: Difference between revisions

Revision as of 23:49, 10 January 2023

Revision as of 01:33, 30 January 2023

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* Rigid ribcage with a well-developed [[keel (bird anatomy)|carina]]

* No functional [[claw]]s on the hand

* Short childhood with distinct adult stage.<ref name=chinsamyetal1998>{{cite journal |author1=Chinsamy A. |author2=Martin L.D. |author3=Dobson P. |year=1998 |title=Bone microstructure of the diving ''Hesperornis'' and the volant ''Ichthyornis'' from the Niobrara Chalk of western Kansas |journal=Cretaceous Research |volume=19 |issue=2 |pages=225–235 |doi=10.1006/cres.1997.0102|doi-access=free }}</ref>

| [[File:Ichthyornis yale.JPG|150px]]

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* A single canine as the first tooth on the [[maxilla]], all other maxillary teeth small

* Tendency for an enlarged caninelike tooth on the [[dentary]]

* Internal nostrils covered by a partial fleshy [[palate]]<ref>{{cite journal|last=Maier|first=W.|author2=Heever, J. |author3=Durand, F. |title=New therapsid specimens and the origin of the secondary hard and soft palate of mammals|journal=Journal of Zoological Systematics and Evolutionary Research|date=27 April 2009|volume=34|issue=1|pages=9–19|doi=10.1111/j.1439-0469.1996.tb00805.x|doi-access=free}}</ref>

* Enlarged temporal opening giving more powerful bite

| [[File:Biarmosuchus.jpg|150px]]