Alonso Garcia-Amilivia, Miguel2018-01-112018-01-112017-01-0113132989https://www.scopus.com/inward/record.uri?eid=2-s2.0-85029923867&doi=10.3897%2fzookeys.697.12204&partnerID=40&md5=c65dfc875a5aa86c0ee1adb721a4ec66http://dspace.ucuenca.edu.ec/handle/123456789/29035Notodiaptomus cannarensis sp. n. is described from a reservoir on the Amazonian slope of the Ecuadorian Andes. The new species is unique among diaptomid calanoid copepods in the display of hypertrophied, symmetrical wing-like extensions at each side of the female composite genital somite. Furthermore, it displays a female urosome reduced to only two somites due to the incorporation of abdominal somites III and IV to the composite genital double-somite, and a male right fifth leg with the outer spine of second exopodal segment recurved and implanted proximally on margin. It differs from any other Notodiaptomus in the display of a large rectangular lamella on proximal segment of exopod of male right fifth leg. The species is currently known only from Mazar reservoir, a eutrophic water body placed above 2127 m a.s.l. on the River Paute (Cañar Province; southern Ecuador), where it is the most common crustacean in the water column.en-USCrustaceaEcuadorReservoirsSouth AmericaZooplanktonArticle10.3897/zookeys.697.12204