Cyrnellus
Banks, 1913
Cyrnellus is a of in the . of at least one , C. fraternus, are specialized inhabitants of submerged wood (snags) in river systems, where they construct retreats. The genus was established by Nathan Banks in 1913. Species within this genus appear to exhibit specific microhabitat preferences related to flow conditions and substrate .
Pronunciation
How to pronounce Cyrnellus: /sɪrˈnɛl.əs/
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Habitat
Submerged wood (snags) in riverine systems. of C. fraternus specifically occupy snags with dense of silt and sand, avoiding soft sand and mud benthic adjacent to submerged wood. Larval distribution is influenced by flow regime, with higher abundance in areas of reduced current velocity.
Distribution
North America (Elm Fork of the Trinity River, Texas documented); South America (Ciénaga San Silvestre; Chocó and Magdalena departments, Colombia).
Seasonality
of C. fraternus emerge May through October; present July through September. overwinters as .
Life Cycle
with of three per year. overwinters in larval stage.
Behavior
Larval retreats constructed on snags serve as stable substratum to periodic high waters. exhibit microhabitat selection based on flow conditions and substrate composition.
Ecological Role
Secondary producer in aquatic . Estimated production for C. fraternus : 1,015.4 mg/m2/yr; mean standing stock : 61.24 mg/m2; cohort P/B ratio: 4.59; annual P/B rate: 16.58/yr. Biomass significantly higher in autumn and summer than winter.
More Details
Data limitations
Detailed information available only for C. fraternus from a single study in Texas. and ecological data for other Cyrnellus are not documented in provided sources.
Sources and further reading
- BugGuide
- Wikipedia
- GBIF taxonomy match
- iNaturalist taxon
- NCBI Taxonomy
- Catalogue of Life
- Microdistribution and Secondary Production of Cyrnellus fratemus Trichoptera: Polycentropodidae) from Snag Habitats in the Elm Fork of the Trinity River, Texas
- Submerged wood inhabiting macoinvertebrates of the Elm Fork of the Trinity River, Texas: Assemblage analyses, comparisons to the benthic fauna, and a study of Cyrnellus fraternus (Trichoptera: Polycentropodidae)