Isoperla montana (Banks)

DeWalt, R. Edward & Grubbs, Scott A., 2011, Updates To The Stonefly Fauna Of Illinois And Indiana, Illiesia 7 (3), pp. 31-50 : 45

Isoperla montana (Banks) .

This species exhibits mainly a central and northern Appalachian distribution ( DeWalt et al. 2010). Males have one spur at the base of the aedeagus, compared to two on I. namata Frison. Nymphs of the two species are currently indistinguishable. We present specimen data from an Indiana ravine stream. The senior author tentatively identified them as I. namata , but they were later identified as I. montana by B.C. Kondratieff. This constitutes a new state record for Indiana and large range extension into the Midwest. The presence of this species calls into question the identification of nymphs in the region as I. namata . Further investigations are ongoing.

IN, Montgomery Co., Tributary Sugar Creek along IN-234 at pull-off, 39.9484, -87.0583, 5/4/2008, R.E. DeWalt, ♂, 2♀, ( INHS) .