River lamprey

Occidentis ayresii

A dark inner band mirrors across both tail lobes

River lamprey is known from Eastern Pacific as a freshwater fish. It occurs in freshwater habitats.

Class: Lampreys
Order: Lampreys
Family: Petromyzontidae
Genus: Occidentis
Maximum length: 28.1 cm
Body shape: anguilliform
Distribution: Eastern Pacific: Tee Harbor, Alaska to Sacramento-San Joaquin drainage in California, USA. Freshwater resident population in Morrison Creek, Vancouver Island, British Columbia (Ref. 12269 ).

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