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hypocercal

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  • hypocercal — type of tail fin where the lower lobe is the longer and is supported by the vertebral column. Asymmetrical externally as well as internally, e.g. Pteraspides (fossil). See also heterocercal …   Dictionary of ichthyology

  • fish — fishless, adj. /fish/, n., pl. (esp. collectively) fish, (esp. referring to two or more kinds or species) fishes, v. n. 1. any of various cold blooded, aquatic vertebrates, having gills, commonly fins, and typically an elongated body covered with …   Universalium

  • Fish — /fish/, n. Hamilton, 1808 93, U.S. statesman: secretary of state 1869 77. * * * I Any of more than 24,000 species of cold blooded vertebrates found worldwide in fresh and salt water. Living species range from the primitive lampreys and hagfishes… …   Universalium

  • Fish anatomy — The anatomy of fish is primarily governed by the physical characteristics of water, which is much denser than air, holds a relatively small amount of dissolved oxygen, and absorbs light more than air does. Body (1) operculum (gill cover), (2)… …   Wikipedia

  • Telescopefish — Taxobox name = Telescopefish image width = 220px image caption = Gigantura chuni regnum = Animalia phylum = Chordata classis = Actinopterygii ordo = Aulopiformes familia = Giganturidae genus = Gigantura genus authority = Brauer, 1901 subdivision… …   Wikipedia

  • Hyperoartia — Taxobox name = Hyperoartians fossil range = Devonian Recent image width = 250px image caption = Sea lamprey from Sweden regnum = Animalia phylum = Chordata unranked classis = Hyperoartia subdivision ranks = subgroups subdivision = Jamoytius… …   Wikipedia

  • Errivaspis — Taxobox name = Errivaspis fossil range = Early Devonian regnum = Animalia phylum = Chordata classis = Heterostraci familia = Pteraspidae genus = Errivaspis Errivaspis is an extinct genus of pteraspid heterostracan that lived in the Early Devonian …   Wikipedia

  • Taiwan angelshark — Taxobox name = Taiwan angelshark image caption = status = trend = regnum = Animalia phylum = Chordata classis = Chondrichthyes subclassis = Elasmobranchii ordo = Squatiniformes familia = Squatinidae genus = Squatina species = S. formosa range… …   Wikipedia

  • Japanese angel shark — Taxobox name = Japanese angel shark image caption = status = trend = regnum = Animalia phylum = Chordata classis = Chondrichthyes subclassis = Elasmobranchii ordo = Squatiniformes familia = Squatinidae genus = Squatina species = S. japonica range …   Wikipedia

  • epicercal — a caudal fin with the upper lobe the longer, upwardly tapering, with the skeletal elements forming the upper margin of the fin. Also called heterocercal but this perhaps applies to both epicercal and hypocercal (lower lobe longer) …   Dictionary of ichthyology

  • heterocercal — the type of tail fin in which the vertebral column turns upwards into the upper lobe which is longer than the lower. Asymmetrical externally as well as internally, e.g. Elasmobranchii, Acipenseridae, Polyodontidae and in many larval Teleostomi.… …   Dictionary of ichthyology


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