The Thorn Spider (Gasteracantha cancriformis) is a neotropical spider of the Micrathena schreibersi species of orb weavers (Araneidae). The spider has a wide distribution throughout Central and South America. Females are large and brightly colored, and have a triangular abdomen with black margins and 10 prominent spines. Males are smaller and less conspicuous than females and are less frequently encountered.