Stenella

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Stenella
Temporal range: Neogene–Present
Stenella coeruleoalba-cropped.jpg
Striped dolphin
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Artiodactyla
Infraorder: Cetacea
Family: Delphinidae
Subfamily: Delphininae
Genus: Stenella
Gray, 1866
Type species
Steno attenuatus [1]
Gray, 1846
Species

S. attenuata
S. frontalis
S. longirostris
S. clymene
S. coeruleoalba
S. rayi

Stenella is a genus of marine mammals in Delphinidae, the family informally known as the oceanic dolphins. [2] [3] [4]

Species

Currently, five species are recognised in this genus: [3]

ImageCommon NameScientific nameDistribution
PanTropSpDolpor (cropped).jpg Pantropical spotted dolphin S. attenuataeastern Pacific Ocean
Atlantic spotted dolphin (Stenella frontalis) NOAA.jpg Atlantic spotted dolphin S. frontalistropical areas of the Atlantic Ocean
A dolphin surfing the waves.jpg Spinner dolphin S. longirostrisPacific Ocean
Stenella clymene.jpg Clymene dolphin S. clymeneAtlantic Ocean
Stenella coeruleoalba Ligurian Sea 02.jpg Striped dolphin S. coeruleoalbaNorth and South Atlantic Oceans, including the Mediterranean

S. rayi was a species of this genus found in North Carolina, in the early Pliocene. [5]

The common name for species in this genus is the "spotted dolphins" or the "bridled dolphins". [2] [3] They are found in temperate and tropical seas all around the world. [2] [3] Individuals of several species begin their lives spotless and become steadily more covered in darker spots as they get older. [2] [3]

The genus name comes from the Greek stenos meaning narrow. [2] [3] It was coined by John Gray in 1866 when he intended it as a subgenus of Steno . [2] Modern taxonomists recognise two genera. [2] [3]

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). [6]

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. [7]

Related Research Articles

<span class="mw-page-title-main">Spinner dolphin</span> Species of mammal

The spinner dolphin is a small dolphin found in off-shore tropical waters around the world. It is famous for its acrobatic displays in which it rotates around its longitudinal axis as it leaps through the air. It is a member of the family Delphinidae of toothed whales.

<span class="mw-page-title-main">Clymene dolphin</span> Species of mammal

The Clymene dolphin, in older texts known as the short-snouted spinner dolphin, is a dolphin endemic to the Atlantic Ocean. It is the only confirmed case of hybrid speciation in marine mammals, descending from the spinner dolphin and the striped dolphin.

References

  1. Wilson, D. E.; Reeder, D. M., eds. (2005). Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Johns Hopkins University Press. ISBN   978-0-8018-8221-0. OCLC   62265494.
  2. 1 2 3 4 5 6 7 Tinker, Spencer Wilkie (1988). Whales of the World. Brill Archive. p. 310. ISBN   9780935848472.
  3. 1 2 3 4 5 6 7 Klinowska, Margaret; Justin Cooke (1991). Dolphins, Porpoises and Whales of the World. IUCN. p. 429. ISBN   9782880329365.
  4. 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.
  5. Bianucci, Giovanni (May 2013). "Septidelphis morii, n. gen. et sp., from the Pliocene of Italy: new evidence of the explosive radiation of true dolphins (Odontoceti, Delphinidae)". Journal of Vertebrate Paleontology. 33 (3): 722–740. doi:10.1080/02724634.2013.744757. ISSN   0272-4634.
  6. 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.
  7. 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.