logging in or signing up General characteristics of Reptiles raniashok Download Post to : URL : Related Presentations : Let's Connect Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Copy embed code: Embed: Flash iPad Dynamic Copy Does not support media & animations Automatically changes to Flash or non-Flash embed WordPress Embed Customize Embed URL: Copy Thumbnail: Copy The presentation is successfully added In Your Favorites. Views: 212 Category: Education License: All Rights Reserved Like it (0) Dislike it (0) Added: December 09, 2012 This Presentation is Public Favorites: 0 Presentation Description DESCRIBES THE GENERAL FEATURES OF REPTILES Comments Posting comment... Premium member Presentation Transcript General Characteristics of Reptiles: General Characteristics of Reptiles Mrs. Rani Ashok Asst. Prof. of Zoology Lady Doak College, Madurai Email: email@example.comREPTILES: Diverse group of animals Lizards Snakes Tortoises Crocodiles Extinct dinosaurs etc. REPTILESREPTILES: From " reptilis " meaning "creeping" REPTILESREPTILES …: First vertebrates which became independent of water and took possession of dry land REPTILES …REPTILES …: Complete colonization of land was achieved by the reptiles, which can lay their eggs on dry land. REPTILES …REPTILES …: Arose in Carboniferous period from Amphibian stock Flourished during Mesozoic era REPTILES …Characteristics of reptiles …: Terrestrial organisms Poikilothermous in nature (Regulate temperature in accordance with the external surrounding temperature) Tetrapods Characteristics of reptiles …Characteristics of reptiles …: Pentadactyl limbs Digits end in claws Body divisible into head, neck and tail Body covered with dry epidermal scales Characteristics of reptiles …Characteristics of reptiles …: Skull bears single condyle One or two temporal fossae are usually found Pineal foramen is present in the skull Teeth are simple, conical and thecodont Characteristics of reptiles …Characteristics of reptiles …: Heart consists of a sinus venosus , 2 auricle and 1 incompletely divided ventricle Has both left and right systemic arches Characteristics of reptiles …Characteristics of reptiles …: Pulmonary respiration i.e. respiration through lungs takes place 12 pairs of cranial nerves seen Metanephric kidneys with no nephrostomes Characteristics of reptiles …Characteristics of reptiles …: Sexes are separate Males possess copulatory organs Fertilization is internal Large eggs with considerable yolk Eggs covered by porous calcareous shell Characteristics of reptiles …REPTILIAN EGGS …: REPTILIAN EGGS …Characteristics of reptiles …: Embryo develops within embryonic membranes – amnion and allantois Most reptiles are oviparous Some snakes are viviparous Characteristics of reptiles …Thank You: Thank You You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.