Stenella longirostris   (Gray,  1828) (Dolphin)
Organism information awaits expert curation
Taxonomy
Kingdom:Animalia
Phylum:Chordata
Class: Mammalia
Order:Cetartiodactyla
Family:Delphinidae

Image copyrights: Maria Theresa Aquino

Description
Size: New born:75-80 cm long; Adult females: 2 m; Adult male: 2.5 m.

Weight: 75-148 kg.

Color: The back is dark and the belly is white, with a band of immediate pale grey separating the two. There is individual variation and, like the Maharashtra specimens, some may be uniformly dark grey in color. Still others may be grey with a white belly. Most of them have a dark stripe from the eye to the flipper, and dark lips and beak tip.

The Spinner Dolphin is a particularly slender dolphin. Its head slopes gently towards the snout; there is, however, a well defined crease at the junction of the melon and the beak. The dorsal fin is sickle shaped and becomes more erect with age. They have 45-65, or more, sharply-pointed teeth in each row. This is the largest number of teeth found in any cetacean.

This species gets its name from its habit of leaping out of water and spinning longitudinally. Individuals have been counted rolling over as much as seven times before falling back into water. Spinner Dolphins will often bow-ride. They are found in small to very large groups, and sometimes they mix with schools of other dolphins. They are frequently found in association with tuna.


Synonym (s)
Stenella microps Gray, 1846
Stenella roseiventris Wagner, 1853
Clymene alope Gray, 1866
Clymene microps Gray, 1866
Clymene stenorhynchus Gray, 1866
Clymenia alope Gray, 1868
Clymenia longirostris Flower, 1884
Clymenia microps Gray, 1871
Clymenia roseiventris Flower, 1884
Clymenia stenorhynchus Gray, 1868
Delphinus alope Gray, 1846
Delphinus longirostris Gray, 1828
(Basionym)
Delphinus microps Gray, 1846
Delphinus roseiventris Wagner, 1846
Delphinus stenorhynchus Gray, 1866
Fretidelphis roseiventris Iredale & Troughton, 1934
Prodelphinus alope Flower, 1885
Prodelphinus longirostris Flower, 1885
Prodelphinus microps Flower, 1885
Prodelphinus roseiventris Gervais in Van Beneden & Gervais, 1880
Stenella alope Fraser, 1950
Stenella microps Miller & Kellogg, 1955
Steno roseiventris Gray, 1866

Common Name (s)
• Long Snouted Dolphin (English)
• Long Beaked Dolphin (English)
• Spinner Dolphin (English)
• Long Snouted Spinner Dolphin (English)
• Long Beaked Porpoise (English)
• Small Headed Dolphin (English)
• Spinner (English)
• Spinner Porpoise (English)
• Central American spinner (English)
• Dwarf Spinner Dolphin (English)
• Eastern Spinner (English)
• Gray's Spinner (English)
• Long-Beaked Dolphin (English)
• Long-Snouted Spinner Dolphin (English)
• Red-Bellied Dolphin (English)
• Rollover (English)
• Whitebelly Spinner (English)
Economic Importance and Threats
Threats:  Anthropogenic
(Fishing has a major impact on population of this species.)

Ecology
Habitat:  Pelagic, Open Sea
Prey:  Fish and squid.
IUCN Status:  Data Deficient

Biogeography


• Kerala, Kozhikode Coast INDIA (Record: 1976-1980, 1980)
• Kerala, Off Kozhikode INDIA (Record: 19/09/1981)
• Tamil Nadu, Porto Novo (Lat: 11.48) (Long: 79.76) INDIA (Record: 15/05/1982)
• Kerala, Kochi INDIA (Record: 07/1983-12/1986, 15/09/2007)
• Maharashtra, Off Janjira Murud INDIA (Record: 05/03/1986)
• Tamil Nadu, Gulf of Mannar INDIA (Record: 29/08/1989, 2008)
• Karnataka, Mangalore (Lat: 11.76) (Long: 74.16) INDIA (Record: 28/12/1990)
• Andhra Pradesh, Off Vishakhapatnam INDIA (Record: 21/08/1991)
• Red Sea
• Bay of Bengal INDIA
• Tamil Nadu, Chennai (Lat: 13.08) (Long: 79.76) INDIA (Record: 09/2004-10/2004)
• Andhra Pradesh, Kakinada (Lat: 16.85) (Long: 80.16) INDIA (Record: 09/2004-10/2004)
• Tamil Nadu, Chennai Harbour (Lat: 13.08) (Long: 79.76) INDIA (Record: 09/2004-10/2004)
• Andhra Pradesh, Kakinada Harbour (Lat: 16.85) (Long: 80.16) INDIA (Record: 09/2004)
• Karnataka, Mangalore Harbour (Lat: 12.85) (Long: 74.81) INDIA (Record: 09/2004)
• Andhra Pradesh, Kakinada INDIA (Record: 20/09/2004)
• Tamil Nadu, Chennai INDIA (Record: 04/10/2004, 26/10/2004)
• Karnataka, Mangalore INDIA (Record: 08/09/2004)
• INDIA

Literature Source(s)
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Page last updated on:2012-11-07

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