HI310 Lecture Notes - Lecture 8: Salamander, Acanthostega, Neoteny

• School: Benjamin Franklin Institute of Technology
• Department: Health Information Technology
• Course: HI310
• Professor: James

Document Summary

- limbs that support their weight on land, feet with digits, bones of hind legs are fused to backbone, no gill slits (ears and glands instead). - legs and limbs emerged from fish due to logs or muddy bottoms. Lungs emerged form oxygen-poor water (ex: acanthostega was a prehistoric aquatic being whom had had limbs. ) - order urodeles (salamanders), order anura (frogs), and order apoda (caecilians) - salamanders & newts can be either totally aquatic or live on land. They walk with a side to side bending of their body due to their ancestry of early terrestrial tetrapods. They display paedomorphosis (meaning they retain larval characteristics as adults) - frogs are terrestrial or aquatic, and use their powerful hind legs to hop along the terrain. They also feed by nabbing insects using a flicking motion from their long and sticky tongue. What are some beneficial adaptations frogs have developed to avoid predators? a. )