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The 51 pages that link to Shark, each with the reason it gives.

• ElectroreceptionRelated: Sharks use electroreception to find prey hidden in sediment or darkness.

• Ray-finned fishBroader topic: Sharks provide a familiar comparison from outside the ray-finned lineage.

• CetaceaCompared with: Sharks may resemble cetaceans in shape but breathe and reproduce as fish.

• CarnivoryBroader topic: Many sharks are marine predators with teeth and sensory systems suited to capturing prey.

• Ampullae of LorenziniNarrower topic: They are the best-known animals whose prey detection depends on ampullae.

• SpiracleBroader topic: Many sharks have spiracles behind the eyes that supply water to the gills.

• ChondrichthyesBroader topic: Sharks are one of the best-known living branches of Chondrichthyes.

• Caudal finRelated: Many sharks have asymmetrical caudal fins unlike the externally symmetrical tails of most bony fishes.

• JawRelated: Their jaws illustrate an early and distinct form of jawed-vertebrate feeding anatomy.

• Whale sharkNarrower topic: The whale shark is the largest member of this broad group.

• TunaCompared with: Some sharks compete with tuna as open-ocean predators, despite their very different anatomy.

• Great white sharkNarrower topic: Great whites are one species within this diverse group.

• OstracodermRelated: Sharks represent a living jawed lineage whose skeleton differs sharply from ostracoderm armor.

• SkateRelated: Sharks are skates’ close relatives within the cartilaginous fishes.

• StreamliningBroader topic: Their body form illustrates biological streamlining in a swimming animal.

• Basking sharkNarrower topic: The basking shark is one of the largest living members of this group.

• ChimaeraCompared with: Sharks are the best-known cartilaginous fishes, but belong to a different subclass.

• PlacodermCompared with: Sharks survived the end-Devonian losses that extinguished placoderms.

• SawfishCompared with: Sawfish are rays, despite their shark-like appearance and the word “fish” in their name.

• BatoideaCompared with: Sharks are batoids' closest major living relatives, but generally retain a more streamlined body.

• Electric rayCompared with: Sharks share the cartilaginous skeleton but differ in body form and lack electric organs.

• GnathostomataBroader topic: Sharks exemplify active predatory forms among living jawed vertebrates.

• FlatfishCompared with: Sharks are not ray-finned fishes, despite including species with flattened bodies.

• Pharyngeal slitBroader topic: Sharks show the respiratory role of persistent pharyngeal openings in jawed vertebrates.

• DunkleosteusCompared with: Dunkleosteus was a bony-plated placoderm, not a shark despite popular comparisons.

• Hammerhead sharkNarrower topic: Hammerheads share the basic body plan and biology of other sharks.

• Requiem sharkNarrower topic: Requiem sharks are one family within the broader shark lineage.

• Carpet sharkNarrower topic: Carpet sharks are one branch of the broader shark lineage.

• Goblin sharkNarrower topic: The goblin shark is a distinctive member of this broader group.

• Greenland sharkNarrower topic: The Greenland shark is one of the largest shark species.

• GuitarfishCompared with: Guitarfishes resemble sharks in having a distinct tail, but their bodies are flattened.

• Megamouth sharkNarrower topic: Megamouth is one of the largest living shark species.

• WobbegongNarrower topic: Wobbegongs are specialized members of the wider shark lineage.

• Spotted ratfishRelated: Sharks are close cartilaginous relatives, but have a different jaw and gill arrangement.

• XiphactinusCompared with: Sharks shared marine habitats with Xiphactinus but belonged to a different vertebrate lineage.

• Cow sharkNarrower topic: Cow sharks are members of this broader group of fishes.

• Evolution of fishBroader topic: Sharks represent a surviving branch of jawed fishes distinct from bony fishes.

• Frilled sharkNarrower topic: The frilled shark belongs to this broader group of fishes.

• River sharkNarrower topic: Glyphis shares the basic anatomy and evolutionary history of sharks.

• SawsharkNarrower topic: Sawsharks are sharks, with the cartilaginous skeleton and gill structure characteristic of the group.

• Thresher sharkNarrower topic: Thresher sharks belong to the broader group of sharks.

• Zebra sharkNarrower topic: The zebra shark shares the defining anatomy and ancestry of sharks.

• AngelsharkNarrower topic: Angelsharks are sharks despite their unusually flattened outline.

• BatomorphiCompared with: Sharks are batoids' closest familiar relatives but usually retain a more fusiform body.

• Blue sharkNarrower topic: The blue shark is one species within this diverse group of fishes.

• Bullhead sharkNarrower topic: Bullhead sharks belong to this broader group of fishes.

• Fiddler rayCompared with: Fiddler rays share shark ancestry but have pectoral fins fused to the head region.

• HoundsharkNarrower topic: Houndsharks are one family within the broader group of sharks.

• HybodontiformesNarrower topic: Hybodontiformes were an extinct order of sharks, distinct from living shark lineages.

• ScyliorhinidaeNarrower topic: Catsharks belong to the diverse group of fishes commonly called sharks.