EN

Parapinnixa affinis

Unknown

Overview

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

Parapinnixa affinis faces severe population decline due to coastal development and habitat modification along its restricted range. The species' obligate association with specific burrowing host organisms makes it particularly vulnerable to sediment disturbance from dredging, port construction, and shoreline armoring. Climate change-induced sea level rise and increased storm intensity further threaten the shallow subtidal and intertidal zones where this crab depends on its hosts for survival.

Threat summary

Habitat

This small pea crab inhabits shallow subtidal and intertidal sandy and muddy sediments along temperate coastlines, living symbiotically within the burrows of polychaete worms and other invertebrate hosts. The species requires stable sediment environments with adequate water flow and specific salinity ranges that support both the crab and its obligate host organisms.

Marine neritic· major

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 Parapinnixa affinis classified as Endangered?
Parapinnixa affinis 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. Parapinnixa affinis faces severe population decline due to coastal development and habitat modification along its restricted range. The species' obligate association with specific burrowing host organisms makes it particularly vulnerable to sediment disturbance from dredging, port construction, and shoreline armoring. Climate change-induced sea level rise and increased storm intensity further threaten the shallow subtidal and intertidal zones where this crab depends on its hosts for survival.
Where does Parapinnixa affinis live?
Parapinnixa affinis 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 Parapinnixa affinis?
The main threats to Parapinnixa affinis 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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