Term
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Definition
| verts arose from chordate anscestors |
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Term
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Definition
| by retention of larval features into adult stage (neoteny-can reproduce) |
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Term
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Definition
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Term
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Definition
| jointed axial skeleton, provided mobility; hagfish/lamprey dont have real backbones |
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Term
| braincase or cranium of verts |
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Definition
| more pronounced cephalization |
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Term
| Subphylum Vertebrata synapomorphies |
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Definition
| bone, spinal column of vert, braincase/cranium |
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Term
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Definition
| early evolution of fishes in marine or estuarine waters; diversification in fresh water; anadromous origin |
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Term
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Definition
| armored verts in Ordovician, 485 mya; prob in Cambrian, ca 600 mya, or before |
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Term
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Definition
| microscopic "cone teeth" , date marine secidments (late proterozoic to late triassic 600-200mya); cellular bone, lack dentine on teeth. cell bone derived, dentine primitive |
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