Hot seat Vertebrate edition

Class osteichthyes This group is the first ossified bone group, they followed the cartilaginous fish which were chondrichthyes. They have a swim bladder

Actinopterygii Ray finned fishes! These fins have “veiny” structures visibly seen in them. Ex: a sun fish

Class dipnoi Strong pectoral and pelvic fins Lobe finned Lived in brackish waters in the Devonian era Explain brackish and tell them devonian era was the era of fish. COELOCANTHS WERE IN THIS GROUP

Tetrapod 4 legged animals Head separate from the body (unlike the fishes) Pelvic bones are fused to the spinal chord for more support on land Ears develop

Class amphibia Consists of frogs and toads, salamanders, and caecilians Means 2 lives, they live part their life in the water and part on land Some go through a metamorphosis Permeable skin? If we smile and nod, she’ll stop asking us questions

Order urodela Salamanders! Have tails, and live in wet environments Some can breath through their skin which is called cutaneous respiration

Order anura They also have cutaneous respiration They do not have tails Go through a metamorphosis period We can breathe through our skin? Cool!

Order apoda They are NOT a worm! Or a snake! They live under the ground, and lack eyes

Amniotes Lay eggs on land, which allows for out of water reproduction The shell provides moisture and safety for the embryo to develop Look over the amniotic egg parts

Clade reptilia Has tuataras, snakes, lizards, turtles, crocodilians, and birds They all have scales! This helps hold in moisture Lay eggs with a shell on land (most) Some odd cases of live birth

Squamata (squamates) Lizards and snakes

Archosaurs Lineage that holds birds and crocodilians Why are birds in the same group as crocodiles or alligators?

archeopteryx The first bird! Had feathers for insulation, not flight! Had claws and a beak with teeth Also the turkey vulture at the WCC

aves Birds! Light, hollow bones for flight All characteristics adapted for flight