WILD 3580 1st Edition Lecture 22 Outline of Last Lecture I Skin II Circulatory System III Feeding and Digestion IV Teeth Outline of Current Lecture I Tooth Attachment II Fangs and Venom III Venom Components IV Antivenin Current Lecture I II Tooth Attachment 1 Acrodont teeth sit on top of the jaw a Most lizards some snakes 2 Pleurodont attached to the side of the jaw a Some lizards some snakes 3 Thecodont teeth are set in sockets a Crocodilians Fangs and Venom Only snakes In the Order Heloderma for lizards only venomous lizards in the world o Gila monster o Beaded lizard No fangs Fang Types o Fangs pair of enlarged teeth in the upper jaw used to deliver venom 1 Aglyphous lack of fangs a Mostly in the Family Colubridae These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute III IV b Same size same shape recurve homodont dentition c Function grasp and hold prey 2 Opisthoglyphous rear fangs a Slightly elongate in the rear of mouth b Family Colubridae c Not as effective 3 Proteroglyphous fixed front fangs a Family Elapidae b Grooved or hollow c Fixed fangs fit into lower jaw pockets when mouth is closed 4 Solenoglyphous hinged front fangs a Family Viperidae b Hollow c Allows maxilla to rotate outward when mouth is open Venom or Poison o Venom is toxin injected Advantages safer saves energy eat larger prey aids in digestion o Poison is toxin ingested Venom Components Enzymes break things down 2 general classes 1 Neurotoxins attack the nervous systems by interfering with neuromuscular transmission a Target the heart and or diaphragm 2 Hemotoxins attack the circulatory system by breaking down red blood cells kill tissues a Mostly Family Viperidae 8 000 snake bites yearly in the U S mostly from W Diamondback Rattlesnake Antivenin Region or species specific Hesitant to give antivenin Many hospitals don t have many short shelf life
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