Prosthesima-insularis
Guides
Sosticus insularis
Long Island Crevice Ground Spider
Sosticus insularis is a ground spider in the family Gnaphosidae, characterized by its association with rocky crevice habitats. The species was originally described as Prosthesima insularis by Banks in 1895 and later transferred to Sosticus. It occurs in northeastern North America, with records from the United States and Canada. The common name 'Long Island Crevice Ground Spider' reflects both its geographic association and habitat preference. As a member of the Gnaphosidae, it is a wandering hunter rather than a web-builder.