9 0 . 1 ▁million ▁years ▁ago .). ▁ ▁Description ▁ ▁These ▁am ph ib ians ▁could ▁reach ▁a ▁length ▁of ▁about ▁, ▁while ▁the ▁length ▁of ▁the ▁sk ull ▁could ▁reach ▁. ▁They ▁res emble d ▁a ▁sal am ander ▁and ▁had ▁a ▁later ally ▁fl atten ed ▁tail ▁with ▁a ▁long ▁fin . ▁The ▁body ▁was ▁completely ▁covered ▁with ▁rounded ▁scales . The ▁portion ▁of ▁the ▁sk ull ▁behind ▁the ▁eyes ▁was ▁quite ▁short . ▁On ▁opposite ▁sides ▁of ▁the ▁head ▁there ▁are ▁three ▁pairs ▁of ▁long , ▁spir al - sh aped ▁external ▁g ills . ▁They ▁had ▁a ▁weak ly ▁o ss ified ▁ske leton ▁and ▁a ▁wide , ▁short ▁sk ull , ▁with ▁huge ▁eye ▁holes . ▁The ▁teeth ▁were ▁small ▁and ▁pe aked . ▁On ▁the ▁hands ▁are ▁present ▁four ▁fingers . ▁ ▁Bi ology ▁and ▁l ifest yle ▁Ap ate on ▁ ▁were ▁sex ually ▁m ature ▁in ▁the ▁lar val ▁state , ▁with ▁the ▁ret ention ▁by ▁adult s ▁of ▁tra its ▁seen ▁in ▁the ▁young ▁( ne ot eny ). ▁This ▁fully ▁aqu atic ▁animals ▁lived ▁in ▁semi - per man ent ▁la kes ▁and ▁p onds . ▁They ▁fed ▁on ▁micro organ isms . ▁ ▁Bibli ography ▁ ▁Cy ril ▁Walker ▁& ▁David ▁Ward ▁( 1 9 9 3 ) ▁- ▁F oss iel en : ▁Ses am ▁N atuur ▁Hand bo eken , ▁Bos ch ▁& ▁Ke uning , ▁Ba arn . ▁▁ ▁G aining ▁Gr ound : ▁The ▁Origin ▁and ▁Early