1. updates Species account due next Monday, March 2 nd Choose amphibian by March 2 nd https://docs.google.com/spreadsheet/ccc?key=0Al6kc199v2J6dEI1bGltX0hF SkJDV2FJSzBlaVZyREE#gid=1 Practical (March 9 th ) Open note but with time restriction The lab notes sheets will be put on the website Open lab times: Friday March 6 th 1:00-3:00, 4:00-6:00 Wednesday March 4 th 12:30 – 3:30 Next week- turtle, croc, alligator identification Updates

2. snakes Order: Squamata Suborder: Serpentes SNAKES Over 25 species of snakes in Nevada, various subspecies Many inhabit either the Great Basin or Mojave Desert, some both or localized Four families

3. Blind snakes Leptotyphlopidae- Blind Snakes 2 genera Fossorial- eyes vestigial Ants and termites- few teeth only lower jaw Spine on tail tip- defense/locomotion Occasionally seen on surface at night Common but little info

4. boas Boidae- Boas 2 subfamilies Boinae Labial temperature sensor pits Erycinae Semifossorial- arid/semiarid Short tails, small eyes, blunt heads (defense display)

5. colubrids Colubridae- Colubrids Worldwide except Antarctica and islands 2/3rds of the worlds species Most structurally diverse group- depending on habits Snakes that don’t fit into another group Paraphyletic

6. vipers Viperidae- Vipers Robust bodies, triangular heads Venomous- fangs erect when biting, folded when mouth is closed Loreal pit for infrared sensors (behind nostril) Predominantly nocturnal All of our vipers are rattlesnakes- segment added to rattle each time snake sheds

7. today Assignment for today Fill out study guide Indicate where species is found Subspecies Some extra questions Check out live snakes Species account, choose amphibian: March 2 nd