VU

Crangonyx grandimanus

Unknown

Overview

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

Crangonyx grandimanus faces significant threats from groundwater pollution and habitat degradation in its limited cave and spring environments. Urban development and agricultural runoff contaminate the pristine groundwater systems this amphipod depends on, while water extraction for human use can lower water tables and dry up critical habitats. The species' extremely restricted range makes it particularly vulnerable to localized environmental changes.

Threat summary

Habitat

This amphipod inhabits underground freshwater systems including caves, springs, and groundwater aquifers in limestone karst regions. It requires clean, well-oxygenated groundwater with stable temperatures and minimal chemical contamination.

FRESHWATER· major

Other threatened species in CRANGONYCTIDAE

VU

Stygobromus cooperi

Unknown
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Stygobromus parvus

Unknown
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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 Crangonyx grandimanus classified as Vulnerable?
Crangonyx grandimanus is classified as Vulnerable because the population is declining and the species faces a high risk of extinction in the medium-term future if current pressures continue. Crangonyx grandimanus faces significant threats from groundwater pollution and habitat degradation in its limited cave and spring environments. Urban development and agricultural runoff contaminate the pristine groundwater systems this amphipod depends on, while water extraction for human use can lower water tables and dry up critical habitats. The species' extremely restricted range makes it particularly vulnerable to localized environmental changes.
Where does Crangonyx grandimanus live?
Crangonyx grandimanus 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 Crangonyx grandimanus?
The main threats to Crangonyx grandimanus 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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