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Classification of reptiles
- 1. Classification of Reptiles Presentedby: Aqib Iqbal
- 2. Introduction to Reptiles Theword ‘Reptilia’ came from latin word ‘Reptum’ which means ‘creep’. They have evolved from the Amphibians and in turn, give raise to the birds and mammals. As a group, the reptiles can be separated from the amphibians by their dry confined skin and from the bird by the absence of feather and from mammal by the absence of hair. From the fossil evidence it is believed that reptiles originated during the carboniferous period around 300-260 million years ago. During the Mesozoic era (Triassic to upper Cretaceous) they were the dominant vertebrates. At the end of the Cretaceous reptiles started to decline. Now most of the species are disappeared and only 4 of 16 orders survive. Only 8734 living reptiles are found all over the world. In Bangladesh 153 species of reptiles are found. Inour presentation we will classify theclass Reptilia upto order.
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- 4. Order Testudines Theyhave a bony part of the shell , but some have a softy , leathery covering. Teeth is absent. Instead each jaw is covered with a horny sheat From a beak which is sharpened or serrated to cut flesh or plant matter. They have strong limbs to lift their heave bodies. The shape of the limb is variable.
- 5. Conti….. In landdwelling species the toes are turned into a solid clump freshwater species have webbed toes & marine water species have powerful flippers.
- 6. Examples Terrapene ornata Chelydraserpentina
- 7. Order Rhynochophalia Thisorder includes the tuataras which are restricted only in New Zealand. They are lizard like. A mid-dorsal row of spines are present. Scale granular , mandibles joined by ligament.
- 8. Conti….. Copulatory organis absent. Anal opening transverse. They live on land & burrows; eats insects, molluscs or small vetebrates.
- 9. Conti…. They areoviparous. Lay eggs in the hole. It takes around 13 months to hatch.
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- 11. Order Crocodilia This orderincludes the alligators , caimans , crocodiles etc. Body long Head large; jaws are powerful. In head thick skin is fused with bone.
- 12. Conti…. Although aquatictheir limbs are well developed. Hind limbs are heavier and four fully digits , wherer the forelimbs has five digits.
- 13. Conti…. They arethe only ectothermic reptiles with a fully developed secondary palate and four chambered heart
- 14. Conti…. They areexcellent swimmers . They swim with their limbs and legs propelling slowly or rapidly.
- 15. Conti…. Distinct parentalcare is present. During breeding season they made mud nest to lay eggs. Female guard their nests and assist the young to escape from their egg shells and nest.
- 16. Examples Crocodilus palustris Alligatormississippiensis C
- 17. Order Squamata Thisorder includes Lizards , Snakes and other extinct groups. They have skin with horny epidermal scales or shields . They shed their skin at intervals to emerge clear & shiny.
- 18. Conti…. They haveextra ordinary jointed skull and jaws that lend them both flexibility & strainght. So they can grip the larger prey more powerfully.
- 19. Conti…. They havemovable quadrate bone Vomerine teeth are absent.
- 20. Conti….. Well developedhemipenis is present.
- 21. Examples Xantusia henshawi Rhabdophissubminiatus