page_title: Shark anatomy
section_title: Fins
hierarchical_section_title: Shark anatomy / Fins
caption_attribution_description: English: Shark dorsal fin with parts labeled.
context_page_description: Shark anatomy differs from that of bony fish in a variety of ways. Variation observed within shark anatomy is a potential result of speciation and habitat variation
context_section_description: Most sharks have eight fins: a pair of pectoral fins, a pair of pelvic fins, two dorsal fins, an anal fin, and a caudal fin. The members of the order Hexanchiformes have only a single dorsal fin. The anal fin is absent in the orders Squaliformes, Squatiniformes, and Pristiophoriformes. Shark fins are supported by internal rays called ceratotrichia.
caption: Dorsal fin diagram with landmarks labeled.
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