"ବ୍ୟବହାରକାରୀ:Snip1/ଡାଇଆପ୍‌ସିଡ୍‌" ପୃଷ୍ଠାର ସଂସ୍କରଣ‌ଗୁଡ଼ିକ ମଧ୍ୟରେ ତଫାତ

'''Diapsids''' ("two arches") are a group of [[amniote]] [[tetrapod]]s that developed two holes ([[temporal fenestra]]) in each side of their [[skull]]s about 300 [[million years ago]] during the late [[Carboniferous]] period.<ref>{{cite web|title=Those diverse diapsids|url=http://www.ucmp.berkeley.edu/taxa/verts/diapsida.php}}</ref> The diapsids are extremely diverse, and include all [[crocodile]]s, [[lizard]]s, [[snake]]s, [[turtle]]s, [[tuatara]], [[bird]]s and non-avian [[dinosaur]]s. Although some diapsids have lost either one hole (lizards), or both holes (snakes), or have a heavily restructured skull (modern birds), they are still [[scientific classification|classified]] as diapsids based on their ancestry. At least 7,925 [[species]] of diapsid reptiles<ref>http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0118199</ref> exist in environments around the world today (nearly 18,000 when birds are included).

 

[[File:Skull diapsida 1.svg|thumb|left|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 (bone)|radius]]) compared to the upper arm bone ([[humerus]]).

 

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

 

|2=[[Archosauromorpha]] }} }} }} }} }} }} }} }} }} }} }}

 

 

* [http://tolweb.org/tree?group=Diapsida&contgroup=Amniota Diapsida]. Michel Laurin and Jacques A. Gauthier. ''Tree of Life Web Project''. June 22, 2000.

* [http://www.fmnh.helsinki.fi/users/haaramo/Metazoa/Deuterostoma/Chordata/Reptilia/Diapsida.htm Diapsida] Cladogram at [[Mikko's Phylogeny Archive]]

 

[[ଶ୍ରେଣୀ:ଡାଇଆପ୍‌ସିଡ଼]]