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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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Credits ()

;ikipedia