Zaitzevia parvula

Zaitzevia parvula is a species of riffle beetle in the family Elmidae.

It is found in North America.

[1][2][3] These two subspecies belong to the species Zaitzevia parvula:

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Page with Z. parvula larvae (right two images, dorsal and ventral aspects) compared with Macronychus glabratus larvae (left two images, dorsal and ventral aspects)
Page with adult Z. parvula (left) compared with adult Ordobrevia nubifera (right)