Trematocephalus is a genus of sheet weavers first described by Friedrich Dahl in 1886.
Species , it contains only four species: Trematocephalus cristatus (Wider, 1834) — Palearctic. "A striking red and blue-black money spider with a hole straight through its head."Isabella Tree, Wilding: The Return of Nature to a British Farm (London: Picador, 2018), p. 271. Trematocephalus obscurus Denis, 1950 — France Trematocephalus simplex Simon, 1894 — Sri Lanka Trematocephalus tripunctatus Simon, 1894 — Sri Lanka
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