Risso's dolphin

noun Ris·so's dolphin \ ˈri-sōz- \

Definition of Risso's dolphin

:a dolphin (Grampus griseus) widely distributed in temperate and tropical seas that has a blunt snout, a rounded forehead, and teeth in the lower jaw only
  • Risso's dolphins, which have small mouths and large foreheads, are deep ocean divers that stay offshore and are rarely seen close to shore.
  • —Peter Fimrite
called also grampus

Origin and Etymology of risso's dolphin

after Giuseppe Antonio (Joseph Antoine) Risso †1845 naturalist born in Nice
Note: Risso contributed a description and drawing of the dolphin, apparently never published on their own, to the French zoologist Georges Cuvier (1769-1832), who briefly described and illustrated the dolphin on the basis of Risso's account in "Rapport … sur divers Cétacées pris sur les côtes de France …," Annales du Muséum d'historie naturelle, tome 19 (1812), pp. 12-13 and plate 1 (under the taxonomic name Delphinus griseus). A later synonym was Delphinus rissoanus (1827), on which the current common name may be based.


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