CR

Mesonerilla prospera

Unknown

Overview

Mesonerilla prospera is a species of invertebrate in the Nerillidae family endemic to Bermuda. In 2000, M. prospera was put on the IUCN Red List under the critically endangered category. The IUCN states that "there are problems with the Order name and the correct placement of the family."

Mesonerilla prospera faces severe threats from coastal development and pollution in its extremely limited range along Mediterranean shorelines. The species' specialized interstitial habitat requirements make it particularly vulnerable to sediment disturbance from construction activities and chemical contamination from urban runoff. Rising sea levels and increased storm intensity associated with climate change pose additional risks to the narrow coastal zones where this microscopic annelid survives.

Threat summary

Habitat

Mesonerilla prospera inhabits the interstitial spaces between sand grains in shallow marine sediments along Mediterranean coastlines. This microscopic polychaete worm requires well-oxygenated, fine-grained sandy substrates in the intertidal and shallow subtidal zones where it feeds on organic matter and bacteria.

Frequently asked questions

Why is Mesonerilla prospera classified as Critically Endangered?
Mesonerilla prospera is classified as Critically Endangered — facing an extremely high risk of extinction in the wild — because population sizes are very small, declining sharply, or restricted to a tiny range. Mesonerilla prospera faces severe threats from coastal development and pollution in its extremely limited range along Mediterranean shorelines. The species' specialized interstitial habitat requirements make it particularly vulnerable to sediment disturbance from construction activities and chemical contamination from urban runoff. Rising sea levels and increased storm intensity associated with climate change pose additional risks to the narrow coastal zones where this microscopic annelid survives.
Where does Mesonerilla prospera live?
Mesonerilla prospera occurs in across multiple regions. Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.
What are the main threats to Mesonerilla prospera?
The main threats to Mesonerilla prospera 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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