BIOL 1202 Chapter : Chapter 34 Vertebrates
Document Summary
We evolved getting different traits and keep adding on till the animals we get today. Which of the following statements in not true: all chordates have notochords, all chordates have pharyngeal pouches, all chordates have post anal tail, all chordates have vertebrae. Concept 34. 1: chordates have a notochord and a dorsal, hollow nerve chord. 2 chordate subphyla are invertebrates: urochordata, cephalochordata. Although some species possess some of these traits only during embryonic development. Post anal tail = after the anus. Sessile marine suspension feeders: draws water in through incurrent siphon, filtering food particles, sea squirts. Tunicates possess the chordate characteristics during their larval stage. Not great swimmers so tend to filter feed. Concept 34. 2: craniates are chordates that have a head. The origin of the head in chordates allowed some to become active predators. Shared characters in craniates: cranium, brain, eyes and other sensory organs. Cartilagenous skull and axial rod derived from notochord.
