Taxon name
Stenella longirostris
(Gray, 1828)
Uploaded by
National Red List Database
Taxonomic information
Scientific name
Stenella longirostris
(Gray, 1828)
Common name(s)
Spinner Dolphin, Long-beaked Dolphin, Long-snouted Dolphin, Gurni Dolphin, Ghulli Dolphin
Assessed taxon level
Species
Higher level taxonomic groupings
Vertebrates
Mammals
Species authority
(Gray, 1828)
Taxonomic notes and synonyms listed
Perrin (1990) and Perrin et al. (1999) recognized four subspecies: S. l. longirostris (Gray's Spinner), S. l. orientalis (Eastern Spinner), S. l. centroamericana (Central American Spinner) and S. l. roseiventris (Dwarf Spinner Population of Bangladesh is
Delphinus longirostris (Gray, 1828)
Location and scope
Specific locality or subnational name or regional name
Bangladesh
Scope (of the Assessment)
National
Countries included within the scope of the assessment
Does the assessment cover a marine EEZ area(s)?
Not_assigned
Conservation Status
Assessed as
Data Deficient
Criteria system used
IUCN
(see Assessment details)
Assessment rationale/justification
Little is known about the distribution and population size of Stenella longirostris in Bangladesh. Fourteen sightings Stenella longirostris in the northern tip of Swatch of No-ground were reported by BCDP (2008) with mean group size 85. There was no more information available from other marine waters of the Bay of Bengal in Bangladesh territory. Thus it is categorized as Data Deficient.
Assessment details
Assessors/contributors/reviewers listed
Md. Zahangir Alom
Criteria system used
IUCN
Reference for methods given
IUCN (2012) IUCN Red List Categories and Criteria: Version 3.1. Second edition. Gland, Switzerland and Cambridge, UK: IUCN. iv + 32pp; IUCN (2012) Guidelines for Application of IUCN Red List Criteria at Regional and National Levels: Version 4.0. Gland, Switzerland and Cambridge, UK: IUCN. iii + 41pp.
URL (link) of redlist assessment or publication
http://iucnredlistbd.org/
Further information
Endemism (according to assessment)
Taxon distribution as listed in assessment
Spinner Dolphins are pan tropical, occurring in all tropical and subtropical waters around the world between 40°N and 40°S (Jefferson et al. 2008). It is mainly restricted to the Swatch of Noground and pelazic, marine waters with high salinity in the Bay of Bengal.
Is there a map available in assessment?
Yes, in the publication/on website
Habitat and systems
Ecological system type
Habitat
Habitat details as listed in assessment
Spinner Dolphins spin high in the air and then land with a loud splash, so can be detected from a long distance. Mother-calf bonds are persistence like other dolphins. They are very social and lives in groups. Large school form, break down and reform with different permutations of subgroups in the course of diurnal inshore-offshore and long shore movement related to nocturnal feeding (Culik 2011). They are often found in close association with Pantropical Spotted Dolphins Stenella attenuata.
History
Data Deficient in Bangladesh (IUCN Bangladesh 2000).
Publication
IUCN Bangladesh. 2015. Red List of Bangladesh Volume 2: Mammals. IUCN, International Union for Conservation of Nature, Bangladesh Country Office, Dhaka, Bangladesh, pp. xvi+232
