Main identification features
- snout short, broad; arched between eyes
- tail fin slender
- pectoral: curved, narrow tip
- white above pectoral
Body stout, cylindrical; head short, rounded between eyes; snout short, conical; forehead profile convex; no groove on nape; eyes small, mouth small, ventral; teeth sharply triangular; gill openings - 5, short, last 2 over pectoral base; first dorsal large, ~midway between pectorals and pelvics; second dorsal and anal very small; pectorals ,very long, narrow, curved, with pointed tip; pelvics large; tail not lunate, upper lobe extremely long, ~equal to body length, fin very thin; no keels on tail base.
Back and under snout brown, grey, blue or blackish; belly abruptly white, this color extending over pectoral fin.
Size: 636 cm.
Habitat: oceanic, pelagic.
Depth: 0-550 m.
Circumtropical; Canada to Chile and throughout our region.
Attributes
Abundance: Common.
Cites: Not listed.
Climate Zone: North Temperate (Californian Province &/or Northern Gulf of California); Northern Subtropical (Cortez Province + Sinaloan Gap); Northern Tropical (Mexican Province to Nicaragua + Revillagigedos); Equatorial (Costa Rica to Ecuador + Galapagos, Clipperton, Cocos, Malpelo); South Temperate (Peruvian Province ).
Depth Range Max: 550 m.
Depth Range Min: 0 m.
Diet: octopus/squid/cuttlefish; bony fishes; Pelagic crustacea; sea snakes/mammals/turtles/birds.
Eastern Pacific Range: Northern limit=55; Southern limit=-55; Western limit=-135; Eastern limit=-77; Latitudinal range=110; Longitudinal range=58.
Egg Type: Live birth; No pelagic larva.
Feeding Group: Carnivore.
FishBase Habitat: Pelagic.
Global Endemism: Circumtropical ( Indian + Pacific + Atlantic Oceans); East Pacific + Atlantic (East +/or West); Transisthmian (East Pacific + Atlantic of Central America); East Pacific + all Atlantic (East+West); All Pacific (West + Central + East); TEP non-endemic; "Transpacific" (East + Central &/or West Pacific); All species.
Habitat: Water column.
Inshore Offshore: Offshore; Offshore Only.
IUCN Red List: Data deficient; Listed.
Length Max: 636 cm.
Regional Endemism: Island (s); Continent; Continent + Island (s); Tropical Eastern Pacific (TEP) non-endemic; Eastern Pacific non-endemic; All species.
Residency: Resident.
Salinity: Marine; Marine Only.
Water Column Position: Mid Water; Near Surface; Surface; Water column only;
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- Balart , E. F. , Castro-Aguirre , J. L. , Aurioles-Gamboa , D. , García-Rodriguez , F. and Villavicencio-Garayzar, C., 1995., Adiciones a la ictiofauna de Bahía de la Paz, Baja California Sur, México., Hidrobiologica, 5:79-85.
- Bellido-Millán, J.M. and Villavicencio-Garayzar, C.J., 2002., Pesqueria artesanal de tiburon en la region central del Golfo de California. En: Lozano-Vilano, M. L. (Ed.). Libro Jubilar en Honor al Dr. Salvador Contreras Balderas., Universidad Autonoma de Nuevo León:143-152.
- Bonnaterre, J. P., 1788., Tableau encyclopédique et méthodique des trois règnes de la nature... Ichthyologie. Paris., Tabl. Encyclop. Méthod. Ichthyol., :1-215.
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- Compagno, L.J.V., 1999., Checklist of living elasmobranchs. In Hamlett W.C. (ed.) Sharks, skates, and rays: the biology of elasmobranch fishes., The John Hopkins University Press:471-498.
- Compagno, L.J.V., 1984., Sharks of the World. An annotated and illustrated catalogue of sharks species known to date. Part 1. Hexanchiformes to Lamniformes. FAO Species Catalogue., FAO Fish. Synop. No 125, 4(1):1-249.
- Eschmeyer , W. N. , Herald , E. S. and Hamman, H., 1983., A field guide to Pacific coast fishes of North America from the Gulf of Alaska to Baja California. Peterson Field Guide Ser. 28., Houghton Mifflin:336pp.
- Findley, L.T., Hendrickx, M.E., Brusca, R.C., van der Heiden, A.M., Hastings, P.A., Torre, J., 2003., Diversidad de la Macrofauna Marina del Golfo de California, Mexico., CD-ROM versión 1.0. Projecto de la Macrofauna del Golfo . Derechos reservados de los autores y Conservación Internacional.
- Fischer , W. , Krup , F. , Schneider , W. , Sommer , C. , Carpenter , K. E. and Niem, V. H., 1995., Guia FAO para la Identificacion de Especies de para los fines de la Pesca. Pacifico Centro-Oriental. Volumen II. Vertebrados - Parte 1., FAO2:647-1200.
- Jimenez-Prado, P., Béarez, P., 2004., Peces marinos del Ecuador continental / Marine fishes of continental Ecuador., SIMBIOE/NAZCA/IFEA tomo 1 y 2.
- Lopez , M. I. and Bussing, W. A., 1982., Lista provisional de los peces marinos de la Costa Rica., Revista de Biologia Tropical, 30(1):5-26.
- Love, M.S., Mecklenburg, C.W., Mecklenburg, T.A., Thorsteinson, L.K., 2005., es of the West Coast and Alaska: a checklist of North Pacific and Artic Ocena species from Baja California to the Alaska-Yukon border., U.S. Department of the Interior, U.S. Geological Survey, Biological Resources Division, 288pp.
- Meek , S.E. and Hildebrand, S.F., 1923., The marine fishes of Panama. Part I., Field Mus. Nat. Hist., Zool. Ser. Publ., XV:1-330.
- Villareal-Cavazos, A., Reyes-Bonilla, H., Bermúdez-Almada, B. and Arizpe-Covarrubias, O., 2000., Los peces del arrecife de Cabo Pulmo, Golfo de California, México: Lista sistemática y aspectos de abundancia y biogeografía., Rev. Biol. Trop., 48:413-424.
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Phylum Chordata 
Class Chondrichthyes 
The Fish Database of Taiwan
FishBase
Discover Life
World Register of Marine Species 
