The ichthyosaur was a large aquatic reptile. Fossils show that it had a dorsal fin and a tail just like fish, even though its closest relatives were terrestrial reptiles that had neither dorsal fins nor aquatic tails. Compared to the fins and tail of fishes, the dorsal fins and tails of ichthyosaurs are ...

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    taxonomic.
    homologous.
    cladistic.
    derived.
    analogous.
asked May 19, 2013 in Biology by anonymous
    

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analogous.
answered May 20, 2013 by Bioshare ~Top Expert~ (34,070 points)

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