Pristinicola hemphilli

Pristine Pyrg

Family: Lithoglyphidae · Class: Gastropoda · Order: Littorinimorpha

Conservation status: G3 S1

The Pristine Pyrg is a small freshwater gastropod mollusk in the family Lithoglyphidae. This diminutive snail exhibits the typical spiral shell morphology characteristic of hydrobiid gastropods, though specific measurements and detailed morphological descriptions have not been well documented in the scientific literature. Pristinicola hemphilli is endemic to the Columbia River basin in the Pacific Northwest. According to the U.S. Fish and Wildlife Service, the species occurs in the lower Columbia River system. Historical records indicate a broader distribution throughout the Columbia River basin, but current populations appear to be restricted to specific localities within this range. The species has been documented in freshwater mollusk surveys at lower Columbia River National Fish Hatcheries, where it was observed alongside other native gastropods including Fluminicola species (USFWS 2021). The species typically inhabits small springs, seeps, and spring-fed creeks within the Columbia River watershed. According to NatureServe, Pristine Pyrg occurs in freshwater riverine habitats including medium rivers, creeks, and spring brooks. These environments are characterized by cool, well-oxygenated water with stable flow regimes. Like other members of the Lithoglyphidae family, this species likely requires specific water chemistry conditions and substrate types for successful reproduction and survival. As a primary consumer, Pristine Pyrg plays a vital role in nutrient cycling and water filtration within its aquatic ecosystem. The species likely feeds on algae, detritus, and organic matter, similar to related springsnails. Reproductive biology and seasonal activity patterns have not been thoroughly studied, though most springsnails are known to be sensitive to temperature fluctuations and water quality changes. The species serves as prey for various aquatic predators including fish, aquatic insects, amphibians, and waterfowl. Pristinicola hemphilli currently holds a global conservation rank of G3 (vulnerable) and a state rank of S1 (critically imperiled) in its range states, indicating significant conservation concern. The species is included in the U.S. Fish and Wildlife Service's listing workplan for potential federal protection consideration, with 12-month findings or petition evaluations planned. Primary threats to the species include habitat degradation from Columbia River impoundments, which have destroyed and fragmented much of the historical habitat throughout its range. Water quality impacts from agricultural runoff, siltation from existing dams, and stream channel modifications for navigation purposes continue to threaten remaining populations. The introduction of non-native species, including the invasive New Zealand mudsnail (Potamopyrgus antipodarum), poses additional competitive pressure on native gastropod communities. Climate change may exacerbate these threats through altered precipitation patterns and temperature regimes affecting spring-fed habitats. Conservation efforts focus on protecting remaining spring habitats and monitoring population trends, though comprehensive surveys and habitat assessments are needed to better understand the species' current status and distribution.

Data from The California Species Project — 14,000+ California species with verified data from CNPS, CDFW, USFWS, and more.