Animals world

Saturday, March 24, 2012

Lizards in the animal world

Introduction:Lizards are the vertebrate animals which have got a welll - developed vertebral column in their dorsal side of the body. They are more developed than fishes and amphibians but less developed then the aves and mammals.
Systematic position: Lizards are included under phylum chordata and class reptilia. Their order is lacertilia. There are two different orders in reptilia, one is lacertilia and another is ophidia. Lacertilia order includes lizards which are with two pairs of limbs. Order ophidia includes the snakes which are limbless lizard
Where do they live? They are terrestrial in habitat i.e. they live on dry terrestrial land. They are completely adapted to live  in dry terrestrial habitat. They have the stream - lined body with horney and dry skin. They have well-developed claws. They are also known as the first amniotic animals because of the presence of the amniotic cavity inside their body. Amniotic fluid present inside the amniotic cavity  helps them to float in the embryonic stage so  that they are not affected by dessication and drying and any dry condition of the environment.
How are lizards different from the snakes? Lizards are different from the snakes in habing two pairs of limbs, and hering capacity where as snakes are limbless and totally deaf reptiles without any ear.

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