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23 Cards in this Set
- Front
- Back
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myxini common name
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hagfish
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extant groups of agnathans
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myxinoidea, petromyzontida
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which characteristic makes myxini vertebrate
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brain
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myxini have what as their back support?
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notochord, no vertebral evidence
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myxini method of escape
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produce large amounts of mucus
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number of nostrils in myxini
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one
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osmoconformers
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myxini
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agnathans common name
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cyclostomes, "round mouth"
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petromyzontida common name
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lamprey
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myxini and petromyxontida both have a _____ skeleton
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cartalagenous
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has potential secondary loss of bone
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lamprey
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conodonts common name
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conetooth
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contains enamel and dentin
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conodont elements
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hardest single substance produced by vertebrae
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enamel
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dentin is produced by...
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adantoblasts, producted by neural crest cells
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what are adantoblasts produced by
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neural crest cells
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ostracoderm common name
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boneskin/shellskin
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key characteristic of ostracoderms
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bone
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what time periods were ostracoderms abundant?
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Silurian and early devonian
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pterapidomorphs common name
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wingshield form
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which group represents the most ancient bony vertebrates
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pteraspidomorphs
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has single fused headform
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other ostracoderms
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agnatha is the outgroup of .....
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gnathostomes (jawless fish)
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