Stygobromus hayi
EN

Stygobromus hayi

Unknown

Photo: Wikimedia Commons (CC) via https://en.wikipedia.org/wiki/Stygobromus_hayi

Overview

A detailed profile for this species is sourced from the IUCN Red List of Threatened Species as assessments become available.

Stygobromus hayi faces severe threats from groundwater contamination and aquifer depletion in its limited range within the Washington D.C. metropolitan area. Urban development and associated pollution sources directly impact the shallow groundwater systems this amphipod depends upon. The species' extremely restricted distribution makes it particularly vulnerable to localized environmental changes, with habitat degradation from surface runoff and chemical contamination posing ongoing risks to remaining populations.

Threat summary

Habitat

This subterranean amphipod inhabits shallow groundwater systems and hyporheic zones in the Potomac River drainage basin around Washington D.C. It occupies interstitial spaces in gravel beds and cave-like voids in weathered bedrock, requiring clean, oxygenated groundwater with stable temperatures.

FRESHWATER· major

Other threatened species in CRANGONYCTIDAE

VU

Stygobromus cooperi

Unknown
VU

Stygobromus parvus

Unknown
VU

Stygobromus putealis

Unknown
Stygobromus araeusVU

Stygobromus araeus

Unknown

Threatened in United States

VU

Lepiota echinella

Unknown
VU

Paddlefish

Polyodon spathula

Unknown
VU

Copper Shark

Carcharhinus brachyurus

Declining
EN

Lyophyllum deliberatum

Unknown

Frequently asked questions

Why is Stygobromus hayi classified as Endangered?
Stygobromus hayi is classified as Endangered — facing a very high risk of extinction in the wild — because population numbers are declining steeply and key habitats are under sustained pressure. Stygobromus hayi faces severe threats from groundwater contamination and aquifer depletion in its limited range within the Washington D.C. metropolitan area. Urban development and associated pollution sources directly impact the shallow groundwater systems this amphipod depends upon. The species' extremely restricted distribution makes it particularly vulnerable to localized environmental changes, with habitat degradation from surface runoff and chemical contamination posing ongoing risks to remaining populations.
Where does Stygobromus hayi live?
Stygobromus hayi occurs in United States. Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.
What are the main threats to Stygobromus hayi?
The main threats to Stygobromus hayi are ai-1, ai-2, ai-3, and ai-4. The full IUCN-classified threat record for this species is detailed on the species page.

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