Thallumetus is a genus of cribellate araneomorph spiders in the family Dictynidae, and was first described by Eugène Simon in 1893.

Species it contains 11 species: Thallumetus acanthochirus Simon, 1904 – Chile Thallumetus ascensionensis Sherwood, Marusik, Peñaherrera-R., Calderón-C. & Sharp, 2024 – Ascension Is. Thallumetus dulcineus Gertsch, 1946 – Panama Thallumetus latifemur (Soares & Camargo, 1948) – Brazil Thallumetus octomaculellus (Gertsch & Davis, 1937) – Mexico Thallumetus parvulus Bryant, 1942 – Virgin Is. Thallumetus pineus (Chamberlin & Ivie, 1944) – USA Thallumetus pullus Chickering, 1952 – Panama Thallumetus pusillus Chickering, 1950 – Panama Thallumetus salax Simon, 1893 (type) – Venezuela Thallumetus simoni Gertsch, 1945 – Guyana

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