Category of Organisms Marine Mammals
Kingdom Animalia
Phylum/Division Chordata
Class Mammalia
Order Cetacea
Family Delphinidae
Genus Stenella
Species longirostris
Binomial Name
Stenella longirostris
Author Gray, 1828
Common Name Spinner dolphin
Local Name  
Size Range
Adults have varied in size from 129 cm to 235 cm and weight from 23 kg to 78 kg

Environment/Habitat
In most tropical waters, nearly all records of spinner dolphins are associated with inshore waters, islands or banks. Around Hawaii spinner dolphins depend on the availability of sheltered shallow bays for use as resting areas during the day. In the ETP, however, spinner dolphins occur in very large numbers on the high seas many hundreds of kilometers from the nearest land. Spinner dolphins favor a specific habitat in the ETP, called by oceanographers "tropical surface water;" it is typified by unusual conditions of shallow mixed layer, shoal and sharp thermocline, and relatively small annual variation in surface temperature (Reyes 1991; Perrin and Gilpatrick 1994). There they are often found in close association with pantropical spotted dolphins, yellowfin tuna (Thunnus albacares) and birds of several species. The dwarf form of the spinner dolphin in Southeast Asian waters apparently inhabits a shallow coral reef habitat (Perrin and Gilpatrick 1994). In the north-central and western Gulf of Mexico, Stenella longirostris is found over intermediate bottom depths, its distribution overlapping with that of purely pelagic and purely coastal species (Davis et al. (1998).
Importance/Value
 
Resilience
 
Endemic No
Found in Marine Park No
Found in Malaysia Yes
Distribution
 
Morphology/Character
The Spinner Dolphin is dark gray, with darker patches in the tail stock, back and throat. Usually it has creamy-white patch on the belly though this varies considerably. The beak is distinctively long and thin, with a dark tip. The fins too are lengthy for dolphins of this size. The dorsal fin is erect and even leans forward in older males found in the eastern Pacific. However this description has to be described as a little loose - Spinner Dolphins are the most variable in form of all cetaceans.
Biology
The gestation period is 10 months. Individuals reach maturity at 4-7 years (females) and 7-10 years (males). Longevity is unknown.

Miscellaneaous
 
Status in IUCN Red List Data Deficient (DD)
Status in CITES Species Database II
Researcher(s)  
Reference(s)
RALF KIEFNER, WHALES & DOLPHINS CETACEAN WORLD GUIDE, PUBLISHED BY IKAN, Page: 211-212
Other Link(s)
Collection Record