Theridion Lanceatum
''Theridion'' is a genus of tangle-web spiders with a worldwide distribution. Notable species are the Hawaiian happy face spider (''T. grallator''), named for the iconic symbol on its abdomen, and '' T. nigroannulatum'', one of few spider species that lives in social groups, attacking prey en masse to overwhelm them as a team. Identification Spiders in this genus are about as long or longer then they are wide. Their chelicerae have two or less teeth on the front edge and none on the back edge. The front leg is the longest in both genders, but the next longest is the second leg in males and the fourth leg in females. The epigyne can vary, but the pedipalp has a median apophysis and a colulus is absent from both genders. In several species, the males have mastidia (projections) on the chelicerae. ''Theridion'' has the anterior eye row slightly curved and with a gap between it and the posterior eye row. This distinguishes it from ''Enoplognatha'', another theridiid ge ...
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Theridion Grallator
''Theridion grallator'', also known as the Hawaiian happy-face spider, is a spider in the family Theridiidae that resides on the Hawaiian Islands. ''T. grallator'' gets its vernacular name of "Hawaiian happy-face spider" from the unique patterns superimposed on its abdomen, specifically those that resemble a human smiling face. ''T. grallator'' is particularly notable because of its wide range of polymorphisms that may be studied to allow a better understanding of evolutionary mechanisms. In additi