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- Shark abstract "Sharks are a group of fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral fins that are not fused to the head. Modern sharks are classified within the clade Selachimorpha (or Selachii) and are the sister group to the rays. However, the term "shark" has also been used for extinct members of the subclass Elasmobranchii outside the Selachimorpha, such as Cladoselache and Xenacanthus. Under this broader definition, the earliest known sharks date from more than 420 million years ago.Since then, sharks have diversified into over 470 species. They range in size from the small dwarf lanternshark (Etmopterus perryi), a deep sea species of only 17 centimetres (6.7 in) in length, to the whale shark (Rhincodon typus), the largest fish in the world, which reaches approximately 12 metres (39 ft). Sharks are found in all seas and are common to depths of 2,000 metres (6,600 ft). They generally do not live in freshwater although there are a few known exceptions, such as the bull shark and the river shark, which can survive in both seawater and freshwater. They breathe through five to seven gill slits. Sharks have a covering of dermal denticles that protects their skin from damage and parasites in addition to improving their fluid dynamics. They have several sets of replaceable teeth.Well-known species such as the great white shark, tiger shark, blue shark, mako shark, and the hammerhead shark are apex predators—organisms at the top of their underwater food chain.Many shark populations are threatened by human activities.".
- Shark class Chondrichthyes.
- Shark class Elasmobranchii.
- Shark conservationStatusSystem "iucn2.3".
- Shark kingdom Animal.
- Shark phylum Chordate.
- Shark thumbnail Tiburón.jpg?width=300.
- Shark wikiPageExternalLink overview.
- Shark wikiPageExternalLink 0603_020603_shark1_2.html.
- Shark wikiPageExternalLink shark-diversity.
- Shark wikiPageExternalLink 2999.
- Shark wikiPageExternalLink Shark.
- Shark wikiPageExternalLink sharks_bkrd.htm.
- Shark wikiPageExternalLink www.elasmo-research.org.
- Shark wikiPageExternalLink checklist_res.htm.
- Shark wikiPageExternalLink www.elasmodiver.com.
- Shark wikiPageExternalLink i2389e.zip.
- Shark wikiPageExternalLink ISAF.htm.
- Shark wikiPageExternalLink www.geerg.ca.
- Shark wikiPageExternalLink ?tsn=551500.
- Shark wikiPageExternalLink www.oceanicdreams.com.
- Shark wikiPageExternalLink www.sampla.org.
- Shark wikiPageExternalLink www.sharkattackfile.net.
- Shark wikiPageExternalLink www.sharkresearchcommittee.com.
- Shark wikiPageExternalLink www.sharks.org.za.
- Shark wikiPageExternalLink www.sharks.org.
- Shark wikiPageExternalLink www.sharktrust.org.
- Shark wikiPageExternalLink www.whaleshark.org.
- Shark wikiPageID "43617".
- Shark wikiPageRevisionID "606460363".
- Shark classis Chondrichthyes.
- Shark hasPhotoCollection Shark.
- Shark imageAlt "Grey reef shark".
- Shark imageCaption Grey_reef_shark.
- Shark imageWidth "250".
- Shark name "Sharks".
- Shark phylum Chordate.
- Shark regnum "Animalia".
- Shark statusSystem "iucn2.3".
- Shark subclassis Elasmobranchii.
- Shark subdivision Carcharhiniformes.
- Shark subdivision "Heterodontiformes".
- Shark subdivision "Hexanchiformes".
- Shark subdivision "Lamniformes".
- Shark subdivision "Orectolobiformes".
- Shark subdivision "Pristiophoriformes".
- Shark subdivision "Squaliformes".
- Shark subdivision "Squatiniformes".
- Shark subdivisionRanks Order_(biology).
- Shark superordo "Selachimorpha".
- Shark trend "unknown".
- Shark subject Category:Commercial_fish.
- Shark subject Category:Elasmobranchii.
- Shark subject Category:Ichthyology.
- Shark subject Category:Predators.
- Shark subject Category:Sharks.
- Shark type Animal.
- Shark type Eukaryote.
- Shark type Fish.
- Shark type Species.
- Shark type Animal.
- Shark type BiologicalLivingObject.
- Shark type EukaryoticCell.
- Shark type Fish.
- Shark type Organism.
- Shark comment "Sharks are a group of fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral fins that are not fused to the head. Modern sharks are classified within the clade Selachimorpha (or Selachii) and are the sister group to the rays. However, the term "shark" has also been used for extinct members of the subclass Elasmobranchii outside the Selachimorpha, such as Cladoselache and Xenacanthus.".
- Shark label "Haaien".
- Shark label "Haie".
- Shark label "Rekiny".
- Shark label "Requin".
- Shark label "Selachimorpha".
- Shark label "Selachimorpha".
- Shark label "Shark".
- Shark label "Tubarão".
- Shark label "Акулы".
- Shark label "قرش (سمكة)".
- Shark label "サメ".
- Shark label "鲨鱼".
- Shark sameAs Žraloci.
- Shark sameAs Haie.
- Shark sameAs Καρχαρίας.
- Shark sameAs Selachimorpha.
- Shark sameAs Marrazo.
- Shark sameAs Requin.
- Shark sameAs Hiu.
- Shark sameAs Selachimorpha.
- Shark sameAs サメ.
- Shark sameAs 상어.
- Shark sameAs Haaien.
- Shark sameAs Rekiny.
- Shark sameAs Tubarão.
- Shark sameAs m.0by6g.
- Shark sameAs Q7372.
- Shark sameAs Q7372.
- Shark wasDerivedFrom Shark?oldid=606460363.
- Shark depiction Tiburón.jpg.
- Shark isPrimaryTopicOf Shark.
- Shark name "Sharks".
