Dysdera portisancti

**Aranha-tenaz-do-Porto-Santo (Dysdera portisancti)** The Aranha-tenaz-do-Porto-Santo is a ground-dwelling spider endemic to Porto Santo island in the Madeira archipelago. As a member of the Dysdera genus, it possesses the characteristic large chelicerae (fangs) adapted for hunting woodlice, its primary prey. These spiders are typically reddish-brown with a robust build and play an important role as predators in the island's terrestrial ecosystem, helping control invertebrate populations. This species is restricted to Porto Santo island, a small volcanic island covering just 42 square kilometers northeast of Madeira. The spider inhabits the island's unique dry subtropical environment, likely occupying areas under stones, in soil crevices, and among leaf litter in the limited natural vegetation zones. The species' critically endangered status reflects the extreme vulnerability of Porto Santo's endemic fauna. The island has experienced significant habitat modification through centuries of human settlement, agriculture, and tourism development. The introduction of non-native plant species has altered the natural vegetation communities, while urban expansion has reduced available habitat. The small island size means that any environmental changes have disproportionate impacts on endemic species with restricted ranges. Limited information exists regarding specific conservation measures for this species, reflecting the broader challenge of protecting invertebrate biodiversity on small oceanic islands. The species' current population trend remains unknown, and without targeted research and habitat protection measures, the outlook for Dysdera portisancti remains precarious. Its survival depends on preserving the remaining natural habitats on Porto Santo island.