classification of class reptilia
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CLASSIFICATION OF CLASS REPTILIA
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There are around 7000 species of reptilesgrouped under approximately 16 orders .
Amongst which 4 orders include livingforms and the rest are extinct.
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Class eptilia is divided into 4 su! classes.
"u! class # $Anapsida%1.The roof of the skull of Reptiles is solid,
temporal fossa is absent .2. Limbs are strong.
3. Carapace and plastron form the bod
covering.
!. "o teeth# use horn $a%s used to rip food
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&ubclass ' ( Anapsidais divided into t%o
orders.1. Cotylosauria 2. Chelonia.
&rder 1: Cotylosauria Example -Seymouria
These are primitive extinct reptiles,includesthe stemreptiles ancestors of all of themore advanced reptiles.The %ere heav)
bodied, spla)limbed, plant)eating reptiles
that e*isted during the Carboniferous +eriod.3-)2 million ears ago/
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&rder ' % Chelonia
The first order of living reptiles comprisingthe Tortoises and Turtles.The are distinguished b the follo%ing
characters( ) There is an osseous e*oskeleton
%hich is combined %ith the endoskeleton to
form a bon case in %hich the bod of the
animal is enclosed, and %hich is covered b a
leather skin, or b horn epidermal plates.
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&ub class '' % (arapsida
This group includes extinctforms. These formslived from Triassic period2!0 to 2 illion 4ears
5go/to Cretaceous period 1!! to - million ears
ago/.
Their skull sho%s one pair of supra temporal
fossae .
Example: Ichthyosaurus, Plesiosaurus.
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&ub class ''' ( )iapsida
)iapsidsare a group of reptiles thatdeveloped t%o temporal fossae on each side
of their skulls during the late Carboniferous
period 3 million ears ago/.The include
both extinct and livingforms.
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&ub class 6iapsida includes t%o super orders
1."uper order *epidosauria and '."uper order Archosauria
1."uper order % *epidosauria includes 3 orders %$
1.+osuchia ,+xtinct-
'.hynchocephalia ,+xtinct except "phenodon-
."/uamata divided into ' su! orders
The diapsids are e*tremel diverse, and include all
crocodiles, li7ards, snakes, sphenodon and non)avian
dinosaurs.
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&rder "/uamata is divided into t%o "u!$orders
1."u! order % *acertilia includesallliards.
'."u! order % &phidia includes all sna2es
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&uper order ( Archosauriaincludes - orders .
! orders extinct,1 livingorder 8Crocodiliaincludes crocodiles ,alligators and gharial .
5lligators Crocodiles
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&ub class #3 % "ynapsidaThese are referred to as 9mammal 8like reptiles: because
some have a superficial mammal)like appearance.
The first emerged in the late +ermian +eriod 2)2-1
million ears ago/,characterised b a single lateral
temporal fossa on each side of the skull
6imetrodon Cnognathus
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&utline
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