Stygoporus

The single known species, Stygoporus oregonensis, was described from eight specimens. As a member of the subtribe Siettitiina within Hydroporinae, it likely shares characteristics with other small, subterranean or groundwater-adapted diving beetles, including reduced eyes and depigmentation. Positive identification requires examination of male genitalia and other subtle morphological features described in the original 1994 description.

Known only from a bathroom in Oregon, suggesting association with groundwater, plumbing systems, or subterranean aquatic habitats. The collection circumstances imply preference for dark, moist environments with stable temperatures.

Known only from Oregon, USA. The type locality is a single bathroom where eight specimens were collected in 1984. No confirmed records exist outside this location.

Discovered in a human-built structure (bathroom), suggesting accidental occurrence or tolerance of artificial subterranean habitats. The 1984 collection event followed by building sanitization (bleaching) and 30-year absence of records highlights challenges in conserving poorly known subterranean fauna.

• SiettitiaShares subtribe Siettitiina; both genera contain rare, groundwater-adapted diving beetles with reduced eyes and limited distributions.
• HydroporusLarger genus in same tribe Hydroporini; Stygoporus distinguished by unique male genitalia and apparent subterranean specialization.

• monotypic
• rare
• subterranean
• North America
• data deficient

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