The spider genus Theridion, for which the family Theridiidae is named, has almost 600 species dispersed worldwide. (Spiders live on every continent except Antarctica.) Theridion grallator (genus and species, or binomial name), commonly referred to as the Hawaiian happy-face spider, occurs only on the Hawaiian archipelago, but they have related species worldwide. Theridion strepitus, found only on the Galapagos Islands, is a blind cave spider without eyes.