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Superregnum: Eukaryota
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Cladus: Craniata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Superclassis: Tetrapoda
Cladus: Reptiliomorpha
Cladus: Amniota
Cladus: Synapsida
Cladus: Eupelycosauria
Cladus: Sphenacodontia
Cladus: Sphenacodontoidea
Ordo: Therapsida
Cladus: Theriodontia
Subordo: Cynodontia
Cladus: Mammaliaformes
Classis: Mammalia
Subclassis: Trechnotheria
Infraclassis: Zatheria
Supercohort: Theria
Cohort: Eutheria
Cohort: Placentalia
Cladus: Boreoeutheria
Superordo: Laurasiatheria
Ordo: Artiodactyla
Subordo: Whippomorpha
Infraordo: Cetacea
Cladus: Neoceti
Parvordo: Odontoceti
Cladus: Delphinida
Superfamilia: Delphinoidea

Familia: Delphinidae
Genus: Stenella
Species: S. attenuata - S. clymene - S. coeruleoalba - S. frontalis - S. longirostris – †S. rayi

Name

Stenella Gray, 1866

References

Stenella in Mammal Species of the World.
Wilson, Don E. & Reeder, DeeAnn M. (Editors) 2005. Mammal Species of the World – A Taxonomic and Geographic Reference. Third edition. ISBN 0-8018-8221-4.

Vernacular names
Deutsch: Fleckendelfine
English: Spotted or bridled dolphins
français: Stenella
日本語: スジイルカ属
polski: Delfiny stenella

Stenella is a genus of aquatic mammals in Delphinidae, the family informally known as the oceanic dolphins.[1][2][3]

Currently, five species are recognised in this genus:[2]

Pantropical spotted dolphin, S. attenuata
Atlantic spotted dolphin, S. frontalis
Spinner dolphin, S. longirostris
Clymene dolphin, S. clymene
Striped dolphin, S. coeruleoalba

The common name for species in this genus is the "spotted dolphins" or the "bridled dolphins".[1][2] They are found in temperate and tropical seas all around the world.[1][2] Individuals of several species begin their lives spotless and become steadily more covered in darker spots as they get older.[1][2]

The genus name comes from the Greek stenos meaning narrow.[1][2] It was coined by John Gray in 1866 when he intended it as a subgenus of Steno.[1] Modern taxonomists recognise two genera.[1][2]

The clymene dolphin (S. clymene) is the only confirmed case of hybrid speciation in marine mammals, descending from the spinner dolphin (S. longirostris) and the striped dolphin (S. coeruleoalba).[4]

Stenella dolphins tend to be more active during nighttime and spend their daytime resting. Although these dolphins are supposed to spend 60% of their daytime resting, they happen to be exposed to human activities for 80% of their day. These patterns of sleep deprivation can have negative impact on their resting habit and leads to decline in their population size.[5]
References

Tinker, Spencer Wilkie (1988). Whales of the World. Brill Archive. p. 310. ISBN 9780935848472.
Klinowska, Margaret; Justin Cooke (1991). Dolphins, Porpoises and Whales of the World. IUCN. p. 429. ISBN 9782880329365.
Walker, Ernest Pillsbury; Ronald M. Nowak; John E. Heyning; Randall R. Reeves; Brent S. Stewart; John E. Heyning; Randall R. Reeves; Brent S. Stewart (2003). Walker's Marine Mammals of the World. JHU Press. p. 264. ISBN 9780801873430.
Amaral, Ana R.; Lovewell, Gretchen; Coelho, Maria M.; Amato, George; Rosenbaum, Howard C. (2014). "Hybrid Speciation in a Marine Mammal: The Clymene Dolphin (Stenella clymene)". PLOS ONE. 9 (1): e83645. doi:10.1371/journal.pone.0083645. PMC 3885441. PMID 24421898.
Tyne, Julian A.; Christiansen, Fredrik; Heenehan, Heather L.; Johnston, David W.; Bejder, Lars (2018). "Chronic exposure of Hawaii Island spinner dolphins ( Stenella longirostris ) to human activities". Royal Society Open Science. 5 (10): 171506. doi:10.1098/rsos.171506. ISSN 2054-5703. PMC 6227997. PMID 30473795.

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