Orthrus is a genus of Southeast Asian jumping spiders that was first described by Eugène Louis Simon in 1900. The name is derived from a two-headed dog in Greek mythology.Apollodorus, 2.5.10.
Species it contains four species, found only in Indonesia and the Philippines: Orthrus bicolor Simon, 1900 (type) – Philippines Orthrus calilungae Barrion, 1998 – Philippines Orthrus muluensis Wanless, 1980 – Borneo Orthrus palawanensis Wanless, 1980 – Philippines
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Photograph of Orthrus sp.