white-sided dolphin

white-sided dolphin (plural white-sided dolphins)

1. Any dolphin of the genus Lagenorhynchus which have conspicuous white markings on the sides of the body: especially Lagenorhynchus acutus in the North Atlantic (the Atlantic white-sided dolphin), and Lagenorhynchus obliquidens in the North Pacific (the Pacific white-sided dolphin). [from 19th c.]
   • 2019, James Proctor, Faroe Islands, 5th edition, Bradt Travel Guides, page 7:

     The white-sided dolphin is very agile and often breaches and lobtails, surfacing to breathe about every 15 seconds.