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Reptiles Jawaher Al-Zahrani Aquatic Animals )Zoo-521) Scientific classification Kingdom: Animalia Phylum: Chordata Class: Reptilia Subclass: Anapsida Order: Testudines Turtles Subclass: Diapsida Order: Crocodilia Family: Crocodylida Nile Crocodile Order: squamata Family: Colubridae and Hydrophiidae (sea snakes) Snakes Turtles Some of the water turtles live in sea and some in freshwater. *A sea turtle cannot retract its limbs and head under its shell as a land turtle can. *Flippers are adapted for swimming. *fore flippers are long and paddle like. *Like other turtles, sea turtles lack teeth. Jaw shape varies among species. Each species has a jaw shape adapted for its diet. *The large, bony shell provides protection from predation and abrasion. *It have large upper eyelids that provide protection for their eyes. * The top of the shell is called CARAPACE. The lower side is called PLASTRON. On the shell are bony plates called SCUTES. Nile Crocodile Crocodiles tend to congregate in freshwater habitats like rivers, lakes, wetlands and sometimes in brackish water. *Unlike other reptiles they have a four-chambered heart and diaphragm *They have a streamlined body that enables them to swim fast. *They have extremely powerful jaws capable of biting down with immense force, by far the strongest bite of any animal and they have evolved powerful muscles that close the jaws and hold them shut. *They have sharp teeth for tearing and holding onto flesh. *Crocodiles heads are V-shaped. *The front limbs have 5 finger and the back limbs have 4 finger. *23 species. Snakes Some of the water snakes live in sea and some in freshwater. *They can be brown, gray, reddish, or brownish-black. They tend to darken as they age. Some will become almost completely black. The belly of this snakes also varies in color. It can be white, yellow, or gray. Usually it also has reddish or black crescents. * If they are picked up by an animal, or person, they will bite, as well as release excrement and musk. Their saliva contains an anticoagulant which can cause it’s wounds caused by biting to bleed profusely •### example: northern water snake. * Body laterally compressed, paddle- like tail helps in swimming. * There are no limbs in the body. * The eyes with no eyelid. Eyes and nostrils places higher on the head to allow them to see without raising their head from water. * It’ s tongue splits and it has conic shape teeth.