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Unit 5: The Evolutionary History of Diversity

Vertebrates possess , and are a sub-phylum of phylum .
Craniates are chordates that have a and includes hagfish.
are craniates that have a , made of vertebrae.
are vertebrates that have that evolved from skeletal supports of the pharyngeal slits.
include sharks and rays with a skeleton made of .
are fish with a endoskeleton.
- are ray-finned fishes.
- are lobe-finned fishes with more muscular pelvic and pectoral fins and include coelacanths and lungfishes.
Tetrapods are Gnathostomes that have limbs, and evolved from lobe-finned fish whose fins developed into limbs adapted for terrestrial life.
undergo from aquatic larva into a terrestrial adult.
- There are orders: are salamanders, are frogs and toads, and are caecilians.
Amniotes are that have an egg adapted for terrestrial life.
Living reptiles include , , , , and .
Mammalia are the only surviving clade of among the amniotes.
- Monotremes are the only mammals that lay .
- Marsupials complete embryonic development within a maternal pouch called .
- Eutherians are mammals that complete their embryonic development within a , joined to the mother by the placenta.
Anthropoids are a branch of and include monkeys and hominoids called .
Hominin are more closely related to humans than to chimpanzees and originated in about 6-7 million years ago.
The Homo genus slowly became more fully and evolved a large .

Summary: Characteristics of chordates
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May 2, 2012 Print