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- External_gills abstract "External gills are the gills of an animal, most typically an amphibian, that are exposed to the environment, rather than set inside the pharynx and covered by gill slits, as they are in most fishes. Instead, the respiratory organs are set on a frill of stalks protruding from the sides of an animals head. This type of gill is most commonly observed on the aquatic larva of most species of salamanders, lungfish, and bichirs (which have only one large pair), and are retained by neotenic adult salamanders and some species of adult lungfish. They are present on non-transforming salamander species such as the mudpuppy, as well as most members of the Proteidae and Sirenidae families, which naturally never metamorphose into an air-breathing form. The embryos of frogs and caecilians also develop external gills at some point in their development, though these are either resorbed before or disappear shortly after hatching. Fossils of the distant relatives of modern amphibians, such as Branchiosaurus and Apateon, also show evidence of external gills.The external gills commonly consist of a single stalk (rami) protruding from a gill arch behind the head of the animal, above an associated gill slit. The stalk usually contains muscle tissue, and may be moved by the animal as a free appendage, in order to stir up stagnant water. The stalk is lined by many thinly walled filaments (fimbriae), containing the majority of blood vessels used in gas exchange. Animals usually have one external gill originating on each gill arch (except the hyoid), which leads to there being three pairs of external gills in salamanders, and four in the gilled larvae of lungfish.".
- External_gills thumbnail Axolotl_Portrait.jpg?width=300.
- External_gills wikiPageID "10607834".
- External_gills wikiPageLength "1911".
- External_gills wikiPageOutDegree "17".
- External_gills wikiPageRevisionID "529647492".
- External_gills wikiPageWikiLink Apateon.
- External_gills wikiPageWikiLink Bichir.
- External_gills wikiPageWikiLink Branchiosaurus.
- External_gills wikiPageWikiLink Caecilian.
- External_gills wikiPageWikiLink Caecilians.
- External_gills wikiPageWikiLink Category:Animal_anatomy.
- External_gills wikiPageWikiLink Fish.
- External_gills wikiPageWikiLink Fishes.
- External_gills wikiPageWikiLink Frog.
- External_gills wikiPageWikiLink Frogs.
- External_gills wikiPageWikiLink Gill.
- External_gills wikiPageWikiLink Gill_slit.
- External_gills wikiPageWikiLink Lungfish.
- External_gills wikiPageWikiLink Mudpuppy.
- External_gills wikiPageWikiLink Necturus.
- External_gills wikiPageWikiLink Neotenic.
- External_gills wikiPageWikiLink Neoteny.
- External_gills wikiPageWikiLink Pharynx.
- External_gills wikiPageWikiLink Proteidae.
- External_gills wikiPageWikiLink Salamander.
- External_gills wikiPageWikiLink Salamanders.
- External_gills wikiPageWikiLink Sirenidae.
- External_gills wikiPageWikiLink File:Axolotl_Portrait.jpg.
- External_gills wikiPageWikiLinkText "External gills".
- External_gills wikiPageWikiLinkText "external gill filament".
- External_gills wikiPageWikiLinkText "external gills".
- External_gills wikiPageWikiLinkText "gilled".
- External_gills hasPhotoCollection External_gills.
- External_gills wikiPageUsesTemplate Template:Amphibian-stub.
- External_gills wikiPageUsesTemplate Template:Animal-anatomy-stub.
- External_gills subject Category:Animal_anatomy.
- External_gills hypernym Gills.
- External_gills comment "External gills are the gills of an animal, most typically an amphibian, that are exposed to the environment, rather than set inside the pharynx and covered by gill slits, as they are in most fishes. Instead, the respiratory organs are set on a frill of stalks protruding from the sides of an animals head.".
- External_gills label "External gills".
- External_gills sameAs 外鰓.
- External_gills sameAs m.02qk1hn.
- External_gills sameAs Q5422028.
- External_gills sameAs Q5422028.
- External_gills wasDerivedFrom External_gills?oldid=529647492.
- External_gills depiction Axolotl_Portrait.jpg.
- External_gills isPrimaryTopicOf External_gills.