BIOL 1202 Chapter : Chapter 34
Document Summary
Concept 34. 1 : chordates have a notochord and a dorsal, hollow nerve chord. All chordates share 4 derived characters: dorsal, hollow nerve chord. Although some species possess some of these traits only during embryonic development. Tunic, leathery covering over their internal organs. Draws water in through incurrent siphon, filtering food particles. Tunicates possess the chordate characteristics during their larval stage. Burry their back end into the substrate, leaving the head in up in the water. They draw water into the mouth, where it is filtered through the gills slits. Food particles filtered out are passed along to the stomach. Retain all the chordate feature throughout their lifespan. A notochord located along the dorsal part of the larva. Concept 34. 2 craniates are chordates that have a head. The origin of the head in chordates allowed some to become active predators. Eyes and other sensory organs detect chemicals or sound. The least derived extant species of craniate.
