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The 29 pages that link to Ichthyosauria, each with the reason it gives.

• PlesiosauriaCompared with: Ichthyosaurs swam with tail flukes, unlike plesiosaurs’ four-flipper propulsion.

• LepidosauriaCompared with: Ichthyosaurs resembled fish in body shape but were not lepidosaurs.

• Plesiosaur locomotionCompared with: Its tail-driven swimming contrasts with plesiosaur propulsion by four flippers.

• SauropterygiaCompared with: Ichthyosaurs were a separate marine reptile lineage, not sauropterygians.

• MosasauridaeCompared with: Ichthyosaurs were another marine-reptile lineage, with a different body plan and history.

• LiopleurodonCompared with: Its body plan differs sharply from the flippered, broad-headed Liopleurodon.

• NothosaurusCompared with: Unlike ichthyosaurs, Nothosaurus retained limbs less transformed for open-water swimming.

• PlacodontiaCompared with: Ichthyosaurs pursued swimming prey rather than specializing in shell-crushing on the seafloor.

• ThalattosauriaCompared with: Ichthyosaurs shared Triassic seas with thalattosaurs but evolved a more fishlike body plan.

• PleurosauridaeCompared with: Ichthyosaurs were marine reptiles, but belonged to a different evolutionary lineage.

• PolycotylidaeCompared with: Ichthyosaurs were another major marine reptile group with a distinct body plan.

• TeleosauridaeCompared with: Ichthyosaurs were fish-shaped marine reptiles, not crocodyliforms like teleosaurids.