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15 Cards in this Set

  • Front
  • Back
Characteristics of Chordates
1. notochord
2. a dorsal
3. hollow nerve cord
4. phayngeal slits
5. post-anal tail
Tunicates
marine suspension feeders call sea squirts; lose chordate qualities
Lancelets
marine suspension feeders that retain the hallmarks of the chordate body plan as adults
Characteristics of Craniates
1. a head with a skull, brain, eyes, and sensory organs
2. develop from cells called a neural crest
Hagfishes
1. jawless, marine craniates with a cartilaginous skull
2. have an axial rod of cartilage derived from the notochord
3. lack vertebrae
vertebrates
1. have a vertebrae
2. elaborate skull
3. aquatic forms have fins or rays
Lampreys
1. Jawless
2. cartilaginous segments surrounding the notochord over nerve cord
Origins of Bones and Teeth
mineralizationoriginated from veretbrate mouth parts
Characteristics of Gnathostomes
1. has a jaw
2. enhanced sensory system
3. extensively mineralized endoskeleton
Chondricthyans
1. a cartilaginous skeleton
2. examples sharks, rays and relatives
Osteichthyans
1. skeleton reinforced by calcium phosphate
2. aquatic forms have bony gill covers and a swim bladder
Ray-Finned Fished
maneuverable fins supported by long rays
Lobe-Fins
1. coelacanths, lungfish, tetrapods
2. aquatic; muscular pedtoral and pelvic fins
tetrapods
1. four limbs and feet with digits
2. also have ears
amphibians
1. moist skin that helps the lungs in gas exchange
2. salamanders, frogs, and caecilians
3. frogs and salamanders undergo metamorphosis of aquatic larva into a terrestrial adult