BIOL 3521 Lecture Notes - Lecture 6: Acanthodii, Actinopterygii, Placodermi
Document Summary
Oral anatomy: no buccal funnel, may teeth with a tongue, cephalization. Unique characteristics: use knotting behavior to produce tug/pull to grab a bite of a carcass, can"t swim backwards or pull on food, use sensory organs to orient themselves, pores along body secrete carbohydrate substance like thick snot. Oral anatomy: buccal funnel, one tooth on a tongue, rows of teeth on round moth, cephalization. Feeding strategy: carnivorous/parasitic: 18/38 species are parasitic. Unique characteristics: adult freshwater lampreys don"t eat, rely on nutrients stored while in larval form, tubular body with post-anal tail. Hagfish biology is poorly known: no known threats but they"re hard to study so who knows for sure, we could be unintentionally hurting them. Lampreys require two habitats: spawn only in fresh water but live in the ocean, semelparity reproduce once and then die, only get one chance, need habitat conditions to be correct. | biol 3521. 001 | lecture #6 | 9/10/2018 |
