ବ୍ୟବହାରକାରୀ:Snip1/ଡାଇଆପ୍‌ସିଡ୍‌

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Common parameters
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Full documentation Parameter list

Diapsid reptiles ଜୀବାଶ୍ମ କାଳ: Pennsylvanian–Present, 307–0 Ma PreЄ Є O S D C P T J K Pg N
Life restoration of an araeoscelidian (Petrolacosaurus kansensis)
Nile crocodile (Crocodylus niloticus)
ବିଜ୍ଞାନଭିତ୍ତିକ ଶ୍ରେଣୀବିଭାଗ
Unrecognized taxon (fix):	Snip1/ଡାଇଆପ୍‌ସିଡ୍‌
Subgroups
†Araeoscelidia Neodiapsida

Diapsids ("two arches") are a group of amniote tetrapods that developed two holes (temporal fenestra) in each side of their skulls about 300 million years ago during the late Carboniferous period. The diapsids are extremely diverse, and include all crocodiles, lizards, snakes, turtles, tuatara, birds and non-avian dinosaurs. Although some diapsids have lost either one hole (lizards), or both holes (snakes), or have a heavily restructured skull (modern birds), they are still classified as diapsids based on their ancestry. At least 7,925 species of diapsid reptiles exist in environments around the world today (nearly 18,000 when birds are included).

ଗୁଣ ଧର୍ମ

Diagram of the diapsid skull

The name Diapsida means "two arches", and diapsids are traditionally classified based on their two ancestral skull openings (temporal fenestrae) posteriorly above and below the eye. This arrangement allows for the attachment of larger, stronger jaw muscles, and enables the jaw to open more widely. A more obscure ancestral characteristic is a relatively long lower arm bone (the radius) compared to the upper arm bone (humerus).

ଶ୍ରେଣୀବିଭାଗ

Below is a cladogram showing the relations of the major groups of diapsids.

Cladogram after Bickelmann et al., 2009 and Reisz et al., 2011:

Diapsida	Araeoscelidia Neodiapsida Orovenator Lanthanolania Tangasauridae Younginidae Claudiosaurus Palaeagama Saurosternon Coelurosauravus Thalattosauria Hupehsuchia Ichthyopterygia Lepidosauromorpha Archosauromorpha

ବାହାର ଲିଙ୍କ

• Diapsida. Michel Laurin and Jacques A. Gauthier. Tree of Life Web Project. June 22, 2000.
• Diapsida Cladogram at Mikko's Phylogeny Archive