Chordate_Phylogeny_Answers

Chordate_Phylogeny_Answers - Gnathostomes start *viviparity...

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SCI 240 Chordate Phylogeny Chart (This chart is not filled in much detail, you can add much more info to it) Animal taxa Example Characteristics Other Urchordata Sea squirt Salps Muscular post anal tail + notochord + dorsal hollow nerve tube + pharyngial gill slits (the 4 diagnostic chordate characteristics) Paedomorphosis Cephalochordata Amphioxus Same as above, but Notochord extends into the head Craniata All of the above + a well developed head + muscular pump in pharynx Monophyletic Myxini Hagfish All of the above Petromyzontida Lamprey All of the above + a vertebral column Vertebrates start Chondricthyes Sharks, rays, chimeras All of the above + jaws + cartilaginous skeleton + paired appendages
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Unformatted text preview: Gnathostomes start *viviparity Actinopterygii Ray finned fishes All of the above + bony skeleton (not cartilaginous) + lung/ swim bladder + ray fins Bony fish *includes Teleostei Actinistia Lobed finned fishes All of the above + lobed fins (not ray fins) Bony fish Dipnoi Lung fish All of the above + pulmonary and systemic circulation Bony fish Amphibia Salamanders, frogs, caecilians All of the above + legs (no ray fins & no cartilaginous skeleton) Tetrapods Start Reptilia Lizards, snakes All of the above + amniotic egg Mammalia You All of the above but no cartilaginous skeleton or ray fins Hair, mammary glands, three middle ear bones, Fur/Hair...
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