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The Pantropical Spotted Dolphin (Stenella attenuata) is a species of dolphin found in all the world's temperate and tropical oceans. The species was beginning to come under threat due to the killing of millions of individuals in tuna purse seines. The 1980s saw the rise of "dolphin-friendly tuna [capturing methods]" in order to save millions of the species in the eastern Pacific Ocean. Download high resolution version (1748x1144, 128 KB)Pantropical spotted dolphin skipping on its tail over the water. ...
Scientific classification or biological classification is how biologists group and categorize extinct and living species of organisms. ...
Phyla Porifera (sponges) Ctenophora (comb jellies) Cnidaria (coral, jellyfish, anenomes) Placozoa (trichoplax) Subregnum Bilateria (bilateral symmetry) Acoelomorpha (basal) Orthonectida (flatworms, echinoderms, etc. ...
Typical Classes Subphylum Urochordata - Tunicatas Ascidiacea Thaliacea Larvacea Subphylum Cephalochordata - Lancelets Subphylum Myxini - Hagfishes Subphylum Vertebrata - Vertebrates Petromyzontida - Lampreys Placodermi (extinct) Chondrichthyes - Cartilaginous fishes Acanthodii (extinct) Actinopterygii - Ray-finned fishes Actinistia - Coelacanths Dipnoi - Lungfishes Amphibia - Amphibians Reptilia - Reptiles Aves - Birds Mammalia - Mammals Chordates (phylum Chordata) include the vertebrates, together with...
Orders Subclass Multituberculata (extinct) Plagiaulacida Cimolodonta Subclass Palaeoryctoides (extinct) Subclass Triconodonta (extinct) Subclass Eutheria (includes extinct ancestors)/Placentalia (excludes extinct ancestors) Afrosoricida Artiodactyla Carnivora Cetacea Chiroptera Cimolesta (extinct) Creodonta (extinct) Condylarthra (extinct) Dermoptera Desmostylia (extinct) Embrithopoda (extinct) Hyracoidea Insectivora Lagomorpha Litopterna (extinct) Macroscelidea Mesonychia (extinct) Notoungulata (extinct) Perissodactyla Pholidota Plesiadapiformes...
Eutheria is a taxon (specifically, an infraclass) nearly synonymous with Placentalia, containing the placental mammals and the nearest ancestors of placental mammals (which are known only from the fossil record). ...
Suborders Mysticeti Odontoceti (see text for families) The order Cetacea includes whales, dolphins and porpoises. ...
Families See text The toothed whales (systematic name Odontoceti) form a suborder of the cetaceans. ...
Genera See text Oceanic dolphins are the members of the Delphinidae family of cetaceans. ...
Species Stenella attenuata Stenella frontalis Stenella longirostris Stenella clymene Stenella coeruleoalba Stenella is a genus in the dolphin family. ...
In biology, binomial nomenclature is the formal method of naming species. ...
John Edward Gray. ...
1846 was a common year starting on Thursday (see link for calendar). ...
Image File history File links Download high resolution version (1357x628, 36 KB) Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1. ...
In biology, a species is the basic unit of biodiversity. ...
Genera See article below. ...
Taxonomy
The species was first identified by John Gray in 1846. Gray's initial analysis included the Atlantic Spotted Dolphin in this species. They are now regarded as separate. Both the genus and specific names come from Latin words meaning thin or thinning. Binomial name Stenella frontalis Cuvier, 1829 Atlantic Spotted Dolphin range The Atlantic Spotted Dolphin (Stenella frontalis) is a dolphin found in the Gulf Stream of the North Atlantic Ocean. ...
Latin is an ancient Indo-European language originally spoken in the region around Rome called Latium. ...
There are three subspecies recognised in Rice's 1998 survey of cetacea taxonomy. Two of these have not been formally named
- S. a. subspecies A, the off-shore form found in the eastern Pacific
- S. a. subspecies B, a form found around the Hawaiian islands.
- S. a. graffmani, coastal form found from Mexico to Peru
State nickname: The Aloha State Official languages Hawaiian and English Capital Honolulu Largest city Honolulu Governor Linda Lingle (R) Senators Daniel Inouye (D) Daniel Akaka (D) Area - Total - % water Ranked 43rd 28,337 km² 41. ...
Physical description The Pantropical Striped Dolphin varies significantly in size and colaration throughout its range. The most significant division is between coastal and pelagic varieties. The coastal form is larger and more spotted. (These two forms have been divided into subspecies only in eastern Pacific populations - see taxonomy above).
Spots are key defining characteristics in adults, though immature individuals are generally uniformly coloured and susceptible to confusion with the Bottlenose Dolphin. Populations around the Gulf of Mexico may be relatively spot-free even in adulthood. In the Atlantic, confusion is possible with the Atlantic Spotted Dolphin. Binomial name Tursiops truncatus Montagu, 1821 Bottlenose Dolphin range (in blue) The Bottlenose Dolphin (Tursiops truncatus) is the most common and well-known dolphin species. ...
Gulf of Mexico in 3D perspective. ...
Broadly speaking the Dolphin has a long thin beak. The upper and lower jaws are darkly coloured but are separated by thin white "lips". The chin, throat and belly are white to pale grey with a limited amount of spots. The flanks are separated into three distinct bands of colour - the lightest at the bottom, followed by a thin grey strip in the middle of the flank and a dark grey back. The tall concave dorsal fin is similarly coloured. The thick tail stock matches the colour of the middle band. Dorsal Fin of the Orca A dorsal fin is a fin located on the backs of fishes, whales, dolphins and porpoises. ...
The Pantropical Spotted Dolphin is very active and is prone to making large splashy leaps from the sea. It is a common breacher and will often clear the water for a second or more. Bow-riding and other play with boats is common.
In the eastern Pacific, the Dolphin is often found swimming with Yellowfish Tuna (hence the problem with dolphin deaths caused by tuna fishing - see the Human interaction section). However they do not feed on that fish. In fact the two species have a similar diet of small epipelagic fish. In other areas the species may also feed on squid and crustaceans.
Birth length is 80-90cm. Adults are about 2.5m long and weigh 120kg. Sexual maturity is reached at 10 years in females and 12 years in males. Lifespan is approximately 40 years.
Population and distribution The Pantropical Spotted Dolphin, as its very name proclaims, is found across all tropical and sub-tropical waters around the world - roughly speaking all oceans and seas between 40° N and 40° S. The total world population is in excess of three million - the second most abudant cetacean after the Bottlenose Dolphin - of which two million are found in the eastern Pacific. However this represents a decrease from at least 7 million since the 1950s. Suborders Mysticeti Odontoceti (see text) The order Cetacea includes whales, dolphins and porpoises. ...
Binomial name Tursiops truncatus Montagu, 1821 Bottlenose Dolphin range (in blue) The Bottlenose Dolphin (Tursiops truncatus) is the most common and well-known dolphin species. ...
Centres of highest population density are the shallow warmest waters (water temperature in excess of 25° c). There is also a tendency for groups to concentrate where there is a high temperature gradient.
Human interaction
 Dolphin swimming ahead of the NOAA Ship RUDE The Pantropical Spotted Dolphin's propensity for associating with Yellowfish Tuna, particularly in the eastern Pacific has in recent history been a very real danger. In the 1960s and 1970s fishermen would capture thousands of dolphin and tuna at once using purse seine nets. The dolphins all died. Over a period of about 25 years 75% of this region's population, and over half the world's total was wiped out. The issue has received wide public attention. Many major supermarkets have found it economically expedient to use tuna suppliers whose fisherman catch tuna by more discriminatory means, and thus advertise their tuna product as dolphin-friendly. Some such products are approved by the Whale and Dolphin Conservation Trust. Download high resolution version (1692x1176, 1273 KB)Pantropical spotted dolphin swimming ahead of the NOAA Ship RUDE Stenella attenuata Copyright NOAA says. ...
Download high resolution version (1692x1176, 1273 KB)Pantropical spotted dolphin swimming ahead of the NOAA Ship RUDE Stenella attenuata Copyright NOAA says. ...
References - Pantropical Spotted Dolphin by William F. Perrin in Encyclopedia of Marine Mammals pp. 865-867. ISBN 01255513402
- Whales Dolphins and Porpoises, Mark Carwardine, Dorling Kindersley Handbooks, ISBN 0751327816
- National Audubon Society Guide to Marine Mammals of the World, Reeves, Stewart, Clapham and Powell, ISBN 0375411410
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