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

• Convergent evolutionBroader topic: Their body shape resembles that of dolphins despite a distant relationship.

• TriassicRelated: Ichthyosaurs flourished in Triassic seas as marine reptiles diversified.

• Marine reptileBroader topic: Ichthyosaurs became highly specialized swimmers during the Mesozoic.

• DiapsidBroader topic: Ichthyosaurs show how diapsid lineages adapted to life in the sea.

• Mary AnningBroader topic: Anning helped uncover the first widely studied ichthyosaur skeleton, found near Lyme Regis.

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

• Early JurassicRelated: They were conspicuous predators in Early Jurassic seas.

• FlipperBroader topic: Ichthyosaurs show that flipper-like limbs evolved in extinct marine reptiles.

• 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.

• Jurassic CoastBroader topic: Lyme Regis discoveries made ichthyosaurs central to early debates about extinction and ancient life.

• Evolution of tetrapodsBroader topic: Their independent aquatic adaptations show how tetrapod limbs were reshaped for swimming.

• Lyme RegisBroader topic: Anning's celebrated Lyme Regis discoveries included exceptionally complete ichthyosaur skeletons.

• Middle TriassicRelated: Ichthyosaurs diversified in Triassic seas, including during the Middle Triassic.

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

• IchthyosaurusNarrower topic: Ichthyosaurus is one genus within this broader group.

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

• OphthalmosaurusNarrower topic: Ophthalmosaurus belongs to this group of marine reptiles.

• ShonisaurusNarrower topic: Shonisaurus belongs to this marine-reptile group.

• Evolution of reptilesBroader topic: Ichthyosaurs show how reptiles independently adapted to life in the open ocean.

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

• TemnodontosaurusNarrower topic: Temnodontosaurus belongs to this group of marine reptiles.

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

• PlatypterygiusRelated: The genus is often understood through the familiar body plan shared by ichthyosaurs.

• 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.