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But with the appearance of the metanephros , the two systems became separated. Reptile s are the first vertebrates that, in an evolutionary sense, have evolved an egg that is truly independent of water. These are some parts of it: The Pharinx and the Esophagus The pharinx is a muscular tube that comunicates the digestive system with the respiratoy system. From Fish and Amphibians to - Title:
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Stomach is divisible into cardiac, fundic and pyloric parts. Pyloric stomach contains pyloric valve. Intestine is differentiated into duodenum and ileum. Intestine very long and very much coiled because is a herbivorous animal Same structures are present. But the bile duct and pancreatic ducts open separately into the proximal and distal ends of the duodenum respectively. A single rectal caecum is present. An ilio-colic valve is present at the junction of the small intestine and large intestine or colon.
At the junction of these portions, a spiral shaped vermi form appendix is present. At the regular intervals of the colon shows pocket-like pouches - 'Haustra'. Colon shows longitudinal muscle folds taeniae'. Cellulose enzyme is produced. Cloaca is common opening for digestive'and urinogenital ducts. It is divided into coprodaeum,urodaeum, and proctodaeum. Cloaca is large and divided into the same parts. On the dorsal side of the proctodaeum a thick walled blindsa"Bursa fabricii" is present.
It becomes degenerated in the adult and is known as cloacal thymus. Liver is bilobed gland. The right lobe has a gall bladder. Liver is bilobed dark red gland.
Gall Bladder is absent. Separate bile ducts are formed. Liver is very large and consists of five lobes. Kupffer's cells are present in the liver. Gall Bladder is present. Pancreas is a whitish gland present between stomach duodenum. Pancreas is a pink coloured gland present the loop of duodenum. Three pancre catic ducts open into the duodenum.
Pancreatic duct opens into the duodenum. Gastric, intestinal glands are also present. Share to Twitter Share to Facebook. Newer Post Older Post Home. Digestive system of rabbit mammal -image. Extinct forms, such as the ichthyosaurs, that hunted active prey had large eyes and presumably excellent vision; many herbivorous types, such as the horned dinosaur Triceratops , had relatively small eyes and weak vision. Colour vision has been demonstrated in few living reptiles.
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Please note that our editors may make some formatting changes or correct spelling or grammatical errors, and may also contact you if any clarifications are needed. Digestive and urogenital systems The digestive system of modern reptiles is similar in general plan to that of all higher vertebrates.
Sense organs Sight In general construction the eyes of reptiles are like those of other vertebrates. Previous page Circulatory system. Page 9 of Learn More in these related Britannica articles: Reptile s, of which there are few endemic families, have mainly Old World affinities. Those most likely to be seen include lizards of the agamid family, skinks a family of lizards characterized by smooth overlapping scales , crocodiles, and tortoises.
Endemic reptiles include girdle-tailed…. Although amphibian gastrulation is considerably modified in comparison with that in animals with oligolecithal eggs e. Such is not the case, however, in the higher vertebrates that possess eggs with…. The living reptiles belong to four orders: The reptile ear has many different forms, especially within the suborder Sauria lizards , and variations occur in…. Unlike lungfishes and amphibians, reptiles depend entirely on their lungs for respiration.
Gills and skin do not provide additional sources of oxygen. Because of the development of a neck…. Reptile s are the first vertebrates that, in an evolutionary sense, have evolved an egg that is truly independent of water.
Indeed, many snakes and lizards have even gone beyond this stage and have attained complete viviparity. It is difficult to generalize about reproductive behaviour…. More About Reptile 41 references found in Britannica articles Assorted References annotated classification In vertebrate: Annotated classification characteristics of chordates In vertebrate: The tetrapods paleontological record In animal: Rise of vertebrates behaviour care for young In animal social behaviour: Social interactions involving the costs and benefits of parental care dormancy In dormancy: Reptiles locomotion In locomotion: