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 mystica (Little Snowflies)
Where & when
In 57 records from GBIF, adults of this species have mostly been collected during March (35%), December (19%), January (19%), February (18%), and November (7%).
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. The absence of erect tergal bristles at midlength (Fig. 16) will distinguish larvae of this species from all but those of Allocapnia aurora among Mississippi species. The truncate posterior margin of the developing male 10 th tergal lobe (Fig. 15) will distinguish these species.
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. Upper limb of epiproct long, conspicuously angled near mid-length, ending in a broadly rounded tip (Fig. 19). Apical half of upper limb covered with short, posteriorly directed, appressed spines; a narrow, median groove divides apical section of upper limb (Figs. 18, 20). Tip of upper limb has an irregular cluster of short hairs extending beneath the epiproct for about 1 / 8 th of its length. In lateral aspect, upper limb only slightly inflated at apex and lower limb bears deep, subapical notches and a small downturned tip (Fig. 19). Male tergal process. The relatively wide and thin 8 th tergal process forms a shallow chevron shaped, and mesally notched projection in dorsal aspect. The small notch separates a pair of narrowly divided, thin knobs; these knobs are covered with scale-like tubercles over most of surface (Figs. 21 - 22).
Female subgenital plate. Abdominal sterna 7 and 8 completely separated by membrane. Posterior margin of subgenital plate typically produced as a narrow lobe; anterior margin of sternum 8 without small lobes (Figs. 23, 61). Source: New Records Of Winter Stoneflies (Plecoptera: Capniidae) In Mississippi
Start a Discussion of Allocapnia mystica
Stonefly Species Allocapnia mystica (Little Snowflies)
Species Range
Common Names
Resources
- NatureServe
- Integrated Taxonomic Information System
- Global Biodiversity Information Facility
- Described by Frison, T.H. (1929) Fall and winter stoneflies, or Plecoptera, of Illinois. Illinois Natural History Survey Bulletin 18, 345–409.