Spiny orb weavers belong to the genus Gasteracantha, andare sometimes commonly called a crab shell spider. They are nonvenomous to humans, and they bare six spines along their abdomens, which can reach widths of 30mm in some species. A similar genus of orb weavers, knownas isoxya, has shorter spikes, and contains around sixteen species.
Gasteracantha cancriformis has a yellow shellon its abdomen, and can be found throughout the southern portion of the United States, and in parts of central and south America, and many tropical island nations, including Jamaica, Cuba, Dominican republic, Bermuda, and Puerto Rico. Several varieties are known to exist in this region. It has invaded Australia, South Africa, the Phillipines, and Hawaii in small populations. Its common habitats include woodland edges, shrubbery, and citrus groves.
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