Diapsid - Wikipedia
Diapsids ("two arches") are a clade of sauropsids, distinguished from more primitive eureptiles by the presence of two holes, known as temporal fenestrae, in each side of their skulls. The earliest traditionally identified diapsids, the araeoscelidians, appeared about three hundred million years ago during the late Carboniferous period. [1]
Diapsid - Simple English Wikipedia, the free encyclopedia
A diapsid is a reptile with two fenestrae (holes) behind the eye on each side of its skull. Most reptiles are diapsids, and the condition does not occur in mammals. The function of the holes is to improve jaw movements, and to reduce the weight of the skull.
The Difference Between...Anapsids, Synapsids, Diapsids and
2016年8月18日 · (a) Anapsid Skull: Skulls that lack openings, known as temporal fenestrae, are anapsids. These include turtles, modern and prehistoric, as well as extinct reptile species. (b) Synapsid Skull: There is a single temporal fenestrae situated below the postorbital bone, in a similar position to the lower opening of a diapsid. Synapsid reptiles are ...
Diapsid - an overview | ScienceDirect Topics
Two bony bars, temporal bars (or arcades), are clearly defined in the diapsid skull, a ventral bar formed mainly by the jugal and quadratojugal bones, and a dorsal bar, between the fenestrae, formed by the postorbital and squamosal bones.
GEOL431 - Vertebrate Paleobiology - UMD
Known only form the anterior skull of a single specimen with diapsid fenestration. Notable because Ford and Benson's, 2018 redescription revealed potential synapomorphies of it and the varanopid "synapsids," causing its inclusion in existing matrices to pull varanopids into Diapsida despite the fact that no varanopid has an open supratemporal ...
Evolutionary origin of the turtle skull | Nature
2015年9月2日 · The evolution of the early reptiles is a complicated story and one particular event — the inferred transformation between an ancestral turtle with a diapsid skull (with openings in the skull ...
Diapsid - an overview | ScienceDirect Topics
Turtles are anapsids, unmistakable due to the presence of a bony shell covering the body. Diapsids include the saurians (crocodilians and, according to many taxonomists, birds) and the lepidosaurians (tuataras, lizards, and snakes) (Zug, 1993). Chelonians (turtles) are represented by over 240 species occurring worldwide.
Diapsids: Evolution & Diversity of Two-Arched Skull Reptiles
2023年8月31日 · Diapsid refers to a group of reptiles characterized by having two specific openings in their skulls. This group includes many modern reptiles like lizards and snakes, as well as birds. Think of it as a unique design feature in the skulls of a vast family of animals.
The diapsid skull form. Simplified schematic lateral and dorsal skull …
In the present study, we provide a basic view on skull biomechanics and offer a framework for more general observations using advanced modeling approaches in the future. We concentrate our...
Diapsid - Encyclopedia.com
2018年5月8日 · diapsid In Reptilia, describes a skull with two temporal openings behind the eye. This type of skull is characteristic of two sub-classes of reptiles: the Lepidosauria, represented today by lizards, snakes, and the rhynchocephalian Sphenodon (tuatara); and the Archosauria , which includes the extinct (thecodonts, pterosaurs , dinosaurs , and ...