Cosumnoperla hypocrena
Szczytko & Bottorff, 1987
Cosumnes Spring Stonefly
Cosumnoperla hypocrena is a of in the Perlodidae, described from California in 1987. The Cosumnoperla contains species associated with spring-fed . As a member of the Isoperlinae, it shares characteristics with other western North American perlodids. The specific epithet refers to the type locality near the Cosumnes River.
Pronunciation
How to pronounce Cosumnoperla hypocrena: /kʰɔˈsʊmnɔpɛɹla hʌɪpəˈkɹiːnə/
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Identification
Distinguished from other Cosumnoperla by male genitalic structures, particularly the shape of the and paraprocts as described in the original species . have reduced or absent wings (brachyptery or microptery), a trait common in spring-dwelling Plecoptera. Nymphs possess gills on the and at the base of the legs, typical of Perlodidae.
Habitat
Spring-fed streams and seepage areas with constant water temperature and flow. Associated with rheocrene and limnocrene spring in the foothills of the Sierra Nevada.
Distribution
Known from California, USA. Type locality is in the Cosumnes River watershed, Amador County. Distribution appears restricted to the central Sierra Nevada foothills.
Seasonality
have been collected in February and March, indicating early spring typical of spring-dwelling stoneflies.
Life Cycle
with , nymph, and stages. Nymphs are aquatic and inhabit spring sources. Development likely spans one year, though specific duration unconfirmed.
Ecological Role
Nymphs function as or omnivores in spring , contributing to nutrient processing in headwater with limited seasonal variation.
Human Relevance
Potential for spring health and groundwater-dependent . Vulnerable to groundwater extraction and spring habitat modification.
Similar Taxa
- Cosumnoperla oenone in the same , distinguished by male genitalic and distribution; C. oenone occurs in different watersheds
- Isoperla speciesSame (Isoperlinae) and similar spring preferences; distinguished by wing reduction patterns and genitalic structures
More Details
Etymology
The specific epithet 'hypocrena' derives from Greek 'hypo' (under) and 'crena' (spring), referring to the subsurface spring at the type locality.
Type Specimens
male and allotype female deposited in the California Academy of Sciences.