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Reptile, any member of the class reptilia, the group of air-breathing vertebrates that have internal fertilization, amniotic development, and epidermal scales covering part or all of their body. The major groups of living reptiles are turtles, tuatara, lizards, snakes, and crocodiles. Reptiles are tetrapod animals in the class reptilia, comprising todays turtles, crocodilians, snakes, amphisbaenians, lizards, tuatara, and their extinct relatives. The study of these traditional reptile orders, historically combined with that of modern amphibians, is called herpetology. Because some reptiles are more closely related to birds than they are to other reptiles (e.). Reptiles have gotten a raw deal in the modern eratheyre nowhere near as populous and diverse as they were 100 or 200 million years ago, and many people are creeped out by their sharp teeth, forked tongues, andor scaly skin. One thing you cant take away from them though is that they are some of the most interesting creatures on the planet. Anal herpes anal sex may spread the herpes viruses hsv-1 and hsv-2. Symptoms include painful sores around the anus that come and go. Reptile - reptile - skull and dentition the skulls of the several subclasses and orders vary in the ways mentioned below. In addition to differences in openings on the side of the skull and in general shape and size, the most significant variations in reptilian skulls are those affecting movements within the skull. As a group, reptilian skulls differ from those of early amphibians. The reptiles probably evolved during the mississippian period (or lower carboniferous), about 40 million years earlier, and a fossil found in scotland in the late 1980s, buried in the mudstone from an ancient lake bed, appears to support this view. Temporal fenestrae are post-orbital openings in the skull that allow muscles to expand and lengthen. Anapsids have no temporal fenestrae, synapsids have one, and diapsids have two. Anapsids include extinct organisms and may, based on anatomy, include turtles (testudines), which have an anapsid-like skull with one opening. Reptiles, like birds, have a cloaca - this is a single opening through which all waste passes. They also process some of their waste into urates - a chalky white substance - just as birds do. Turtles have been missing their archaeopteryx, their missing link to the rest of the vertebrate tree, since darwin told us that we should be looking for one, said bever. With odontochelys, pappochelys and now eunotosaurus, we now have a remarkable series of transitional forms that take us from an almost lizard-like creature to the modern.