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dentition cva
| Question | Answer |
|---|---|
| what are placoid scales | derived from the dental armor of extinct fish, ancestral structure that evolved to become teeth |
| what gradual transition do placoid scales show, and what is outside in hypothesis | you can see placoid scales becoming slightly larger and more tooth-like near the mouth and jaw margins. |
| teeth may vary among vertebrates d/t | Number Distribution in mouth Degree of permanence Mode of attachment Shape |
| most vertebrates through reptiles have a succession of teeth. what is this called | polyphodont |
| arcodont/pleurodont | teeth that are loosely attached to the jaw with ligaments—the teeth fall out easily, but are easily replaced throughout the animal’s lifetime |
| thecodont | teeth set into a deep socket, unlikely to fall out d/t limited sets of teeth |
| fish teeth distribution | all in the oral cavity and pharynx |
| shark teeth structure | held by ligament, so very weak, fall out and get replaced very often, conveyer belt of teeth, front ones fall out new teeth from behind replace |
| early tetrapod teeth distribution | teeth widely dist on palate |
| amphibian teeth distribution | on vomer, palatine, pterygoid |
| reptile teeth dist | SOME reptiles have teeth on the vomer, palatine, or pterygoid |
| what is sphenodon | tuatara |
| teeth of venomous snakes | their fangs have a long groove that extends from the venom gland to the tooth tip |
| what is plicidentine | the bottom part of each snake tooth is wrinkly and folded |
| what are squamates | snakes and lizards |
| reptile teeth- crocodilians | limited to the jaws, relatively undifferentiated |
| retile other than crocodial teeth shape | undifferentiated, only tegu lizard are exception but they can be specialized |
| vertebrate tooth replacement trends | w/o mammals, they get replaced in waves |
| mammal teeth replacement | 2 sets of teeth (diphydont), milk (deciduous) and permanent |
| vertebrates other than mammals | all teeth are typically shaped alike (homodont) |
| heterodont dentition | mammals, diff types of teeth like incisors, canines, pre molars and molars |
| brachydont vs hypsodont | horses, cow, deer- hypsodont others- brachydont, humans, dogs, pigs |
| do baleen whales have teeth | no, they use a series of keratin plates to filter particles from a gulp of water they used to have teeth in womb, but teeth are reabsorbed |
| types of dino teeth | piercing, chopping, slicing, raking |
| saurischian dinos | -both herbivores and carnivores - teeth extend around entire margin of jaw, or lim to front -teeth were adapted to cutting and tearing but not chewing -food ground up in gizzard, aided by gastrolith digestive stones |
| sauriscian dino examples | theropods(bipedal carnivorous dinos) sauropods and prosauropods (large quadrupedal herbivode dinos, long necks) |
| theropod teeth | sharp, serrated, cutting meat |
| sauropod teeth | peg/spoon like, more for stripping leaves |
| ornithischian dinos | all herbiores, lacked teeth in front of upper and lower jaes, front teeth replaced by beak, lower jaw had predentary bone, back teeth well adapted for crushing veg |
| hadrosaurs | duck billed dinosaurs, duck shaped beak, so so so many teeth |
Created by:
kavyasurav