TrematocephalusTrematocephalus is a genus of sheet weavers first described by Friedrich Dahl in 1886.Species, it contains only four species:Trematocephalus cristatus — Palearctic. "A striking red and blue-black money spider with a hole straight through its head."Trematocephalus obscurus Denis, 1950 — FranceTrematocephalus simplex Simon, 1894 — Sri LankaTrematocephalus tripunctatus Simon, 1894 — Sri Lanka