ely s ▁was ▁most ▁likely ▁was ▁an ▁aqu atic ▁t urt le , ▁sw imming ▁throughout ▁l ago ons ▁and ▁la kes , ▁rather ▁than ▁terrest rial ▁animal ▁that ▁died ▁in ▁a ▁body ▁of ▁water . ▁It ▁is ▁therefore ▁one ▁of ▁the ▁oldest , ▁and ▁best ▁known , ▁ext inct ▁aqu atic ▁t urt les , ▁and ▁might ▁represent ▁a ▁new ▁evolution ary ▁stage ▁of ▁t urt le . ▁ ▁Fa una ▁E ile anch ely s ▁existed ▁in ▁the ▁Kil mal u ag ▁Form ation ▁of ▁the ▁Great ▁Est u ar ine ▁Group . ▁This ▁formation ▁has ▁an ▁abund ance ▁of ▁t et rap od ▁fa una , ▁including ▁sal am and ers ; ▁the ▁ch or ist od ere ▁C ten i ogen ys ▁sp .; ▁cro cod ili ans ; ▁the ▁le pid osa ur omorph ▁Mar mor etta ▁sp .; ▁various ▁l iz ards ; ▁p ter osa urs ; ▁din osa urs ; ▁the ▁syn aps id ▁S tere ogn ath us ▁he brid icus ; ▁and ▁early ▁m amm als . ▁ ▁References ▁ ▁External ▁links ▁▁ ▁Ear liest ▁Sw imming ▁T urt le ▁F oss ils ▁Found ▁-- ▁New ▁Species ▁BBC ▁NE WS ▁| ▁Science ▁& ▁Environment ▁| ▁An cient ▁t urt le ▁discovered ▁on ▁Sky e ▁‘ Miss ing ▁link ’ ▁t urt le ▁was ▁sw imming ▁with ▁din osa urs ▁Ear liest ▁aqu atic ▁t urt les ▁found ▁in ▁Scotland ▁| ▁Natural ▁History ▁Museum ▁' Miss ing ▁link ' ▁t urt le ▁sw am