Ammonite snail

Ammonite Snail (Helenoconcha relicta)

The ammonite snail is a critically endangered terrestrial gastropod distinguished by its distinctive coiled shell that resembles the fossilized remains of ancient marine ammonites. This small land snail typically measures 15-20mm in diameter, with a tightly wound spiral shell featuring pronounced ridges. The species exhibits typical gastropod behavior, feeding on decaying organic matter and fungi while playing a role in nutrient cycling within its ecosystem.

Endemic to Saint Helena, this species occupies a highly restricted range on the remote South Atlantic island. Historically found in the island's native cloud forest habitats, the ammonite snail requires specific microclimate conditions including high humidity and stable temperatures provided by indigenous vegetation cover.

The species faces severe threats from habitat destruction caused by invasive plant species that have fundamentally altered Saint Helena's native ecosystems. Non-native flora has displaced indigenous plants that create the specialized conditions necessary for the snail's survival. Additionally, introduced invertebrate predators and competitors have further pressured remaining populations.

Conservation efforts focus on habitat restoration through invasive species control and native plant propagation programs. The Saint Helena Government, working with international partners, has established protected areas and implemented species monitoring protocols. Ex-situ breeding programs are being developed to maintain genetic diversity while habitat restoration continues.

The species' outlook remains precarious due to its extremely limited range and ongoing habitat pressures. Recovery depends entirely on successful ecosystem restoration and continued invasive species management. Without sustained conservation intervention, the ammonite snail faces potential extinction within decades.