Salmonflies
Pteronarcys californica
The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.
Stonefly Species Allocapnia virginiana (Little Snowflies)
Species Range
Identification
Species ID from GBIFthe Global Biodiversity Information Facility
Source: Larvae Of The Winter Stonefly Genus Allocapnia (Plecoptera: Capniidae) In Mississippi, Usa
Diagnosis. Among the other species whose larvae display erect or semi-erect bristles at midlength of most abdominal terga (Allocapnia granulata, Allocapnia rickeri, Allocapnia starki) the larvae of Allocapnia virginiana are distinguished from Allocapnia rickeri by virtue of a straight dorsal margin of developing male tergum 10 (Fig. 31), and from the others in having the posterolateral aspect of this structure slanted rather than truncate.
Physical description
Most physical descriptions on Troutnut are direct or slightly edited quotes from the original scientific sources describing or updating the species, although there may be errors in copying them to this website. Such descriptions aren't always definitive, because species often turn out to be more variable than the original describers observed. In some cases, only a single specimen was described! However, they are useful starting points.
Description from GBIFthe Global Biodiversity Information Facility
Source: The Winter Stoneflies (Plecoptera: Capniidae) Of Mississippi
Male epiproct. Epiproct dorsal limb usually apically truncate, and bearing a prominent, suture in apical half of limb (Fig. 46); apical section of limb bears numerous fine anastomosed grooves and ridges covering apical half (Fig. 48); basally the wide, apical, ridged section is separated from smooth and narrowed base by a pair of lateral concavities (Figs. 46 - 47). Lower limb slightly wider than upper limb for most of length and bearing subapical notches.
Female subgenital plate. Abdominal sterna 7 and 8 separated by membrane, or sometimes poorly fused by faint sclerite. Subgenital plate broadly arcuate and usually projecting slightly beyond posterolateral margins of sternum 8 (Figs. 51, 65). Source: New Records Of Winter Stoneflies (Plecoptera: Capniidae) In Mississippi
Start a Discussion of Allocapnia virginiana
Stonefly Species Allocapnia virginiana (Little Snowflies)
Species Range
Common Names
Resources
- NatureServe
- Integrated Taxonomic Information System
- Global Biodiversity Information Facility
- Described by Frison, T.H. (1942) Studies of North American Plecoptera, With Special Reference to the Fauna of Illinois. Illinois Natural History Survey Bulletin 22, 235–355.