Tsalia berneri

Distinguished from other Ephemerellidae by the combination of: gills on abdominal segments 1-7 (as opposed to 1-6 in some congeners); forewing with costal angulation present; and male genitalia with forceps three-segmented and penes separated. The genus Tsalia is separated from Ephemerella primarily by details of the nymphal gill structure and wing venation, though specific diagnostic characters for T. berneri require examination of type specimens.

Aquatic environments; specific microhabitat preferences undocumented but inferred to include cool, well-oxygenated streams and rivers based on family-level ecology.

Nearctic region; recorded from North America. Specific locality records are sparse in available databases.

Hemimetabolous development with egg, nymph, and adult stages. Nymphs are aquatic and undergo multiple instars. Specific voltinism and developmental duration unknown.

Nymphs function as collector-gatherers or scrapers in stream food webs, processing detritus and periphyton. Adults are short-lived and do not feed.

Limited direct significance; may contribute to biomonitoring assessments of stream health due to sensitivity to water quality perturbations, though not specifically targeted in standard protocols.

• EphemerellaFormerly classified within this genus; separated based on gill morphology and wing venation details.
• Tsalia pallidaCongener with overlapping distribution; distinguished by coloration and male genitalic structure.

• mayfly
• Ephemerellidae
• Nearctic
• aquatic insect
• stream insect

• BugGuide
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
• Catalogue of Life