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Photo#1584811
riffle beetle larva - Macronychus glabratus

riffle beetle larva - Macronychus glabratus
Milton, Norfolk County, Massachusetts, USA
July 12, 2018
Size: 3.5 mm
Inadvertently collected with handful of submersed Callitriche stems, shallows just downstream of Harvest Bridge, Neponset River.

Images of this individual: tag all
riffle beetle larva - Macronychus glabratus riffle beetle larva - Macronychus glabratus riffle beetle larva - Macronychus glabratus riffle beetle larva - Macronychus glabratus

re: size
.52 mm width of visible portion head capsule falls between 4th and 5th of 6 instars: Life Cycle, Growth, Survival, and Production of Macronychus glabratus (Coleoptera: Elmidae) in Northwest Arkansas and Southeast Texas Streams (Phillips, 1997)

Moved
Moved from Riffle Beetles.

looks like

but pronotum more squared off

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