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14 Cards in this Set
- Front
- Back
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Chondrichthyes
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sharks, rays and chimearas
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smallest shark
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dwarf latern shark - 21cm
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largest shark
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whale shark 13m and 20 tonnes
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speed shark
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74km/hr
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tapetum lacidum
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a reflective layer in the eye
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ampullae of lorenzini
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pit like organs on the snout detect electric fields
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3 main groups of sharks
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Chimeras (Holocephali Rays (Botoidea sharks (Selachiomorpha |
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Torpedos
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electric rays
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2 main groups of sharks
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Squalimorphil (dogfish and kin Galeomorphii (requiem shark, mackerel shark, catshark and kin) |
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oldest shark
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Cladoselache
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Acanthodians
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now recognised as shark relative
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Placoderms
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even more distant from sharks have large bony plate on skull |
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Modern shark radiation
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Squalicorax - cretaceous lamnid Myledaphus - cretaceous guitarfish Scapanorhynchus - cretaceous goblin shark |
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punctuated equilibrium
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evolution eventually stop because you cannot improve something endlessly
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