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history:evolution [2020/07/07 18:23]
gary1 [Vertebrata]
history:evolution [2020/07/10 09:17]
gary1 [Vertebrata]
Line 157: Line 157:
         * all became extinct by the end of the Devonian         * all became extinct by the end of the Devonian
       *Placoderms (armoured fish) all became extinct by the of the Permian       *Placoderms (armoured fish) all became extinct by the of the Permian
-      *gnathostomes (jawed fish - evolved ability to convert nitrogen waste into **urea** which helped raise their blood osmolarity to that of sea water allowing migration to marine waters; development of the **sympathetic nervous system**)+      *gnathostomes (jawed fish - evolved ability to convert nitrogen waste into **urea** which helped raise their blood osmolarity to that of sea water allowing migration to marine waters; development of the **sympathetic nervous system**; development of vertebrate **dentition** c430mya;)
           *Chondrichthyes / Acanthodians (cartilaginous fish, no swim bladders or lungs; sharks, rays, skates and the extinct spiny sharks)           *Chondrichthyes / Acanthodians (cartilaginous fish, no swim bladders or lungs; sharks, rays, skates and the extinct spiny sharks)
           *Osteichthyes (c420mya common ancestor of **bony fish and developed a primitive air-breathing lung**)           *Osteichthyes (c420mya common ancestor of **bony fish and developed a primitive air-breathing lung**)
history/evolution.txt ยท Last modified: 2020/08/06 20:13 by gary1