Plesiosaurer, også kaldet svaneøgler, var store havleven... - dofaq.co
Plesiosaurer , også kaldet svaneøgler , var store havleven...Plesiosaurer , også kaldet svaneøgler , var store havlevende, kødædende krybdyr, der ikke hører til dinosaurerne, da de er euryapsider. De første former dukkede op i sen Trias. De trivedes indtil den store uddøen i slutningen af Kridttiden. Den typiske plesiosaurus havde en bred krop med en kort hale. Dyrene havde fire lemmer, der var udviklede til luffer. Mange typer af svaneøgler havde lange halse og forholdsvis små hoveder.
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