I’ve never seen this before: a few hundred riffle beetles, Elmidae, all gathered behind a boulder in Rio Java. The larva are common, and I’d rarely see individual adults—here, in the thin film of water cascading over the boulder, were hundreds.
I’ve never seen this before: a few hundred riffle beetles, Elmidae, all gathered behind a boulder in Rio Java. The larva are common, and I’d rarely see individual adults—here, in the thin film of water cascading over the boulder, were hundreds.
