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The long-legged crickets (Orthoptera, Grylloidea, Phalangopsidae Blanchard, 1845) collected during the ‘Our Planet Reviewed’ expedition of the Muséum national d'Histoire naturelle, Paris, and Pro-Natura International in 2015 in the Mitaraka region (Tumuc-Humac mountains, French Guiana) are studied. Among the 105 specimens, all collected by sight, 21 species (14 genera) have been identified. They include two new genera and eight new species, all described here: Aracopsis hugeli Desutter-Grandcolas, n. gen., n. sp., which calling song is described, close to PhalangopsisServille, 1831 and Philippopsis Desutter-Grandcolas, 1992; Mellomima guyanensis Desutter-Grandcolas, n. gen., n. sp. close to Mellopsis Mews & Sperber, 2010, Guabamimade Mello, 1992 and PizacrisSousa-Dias & Desutter-Grandcolas, 2015; and the following species: Ectecous lamelliferus Desutter-Grandcolas, n. sp., Lerneca mitarakensis n. sp., Luzaridella miniata n. sp., Luzaridella maculata n. sp., Paraclodes cunicula Desutter-Grandcolas, n. sp. and Paraclodes furcata Desutter-Grandcolas, n. sp. The genus Paraclodes Desutter-Grandcolas, 1992 n. stat. is restored from its subgeneric status, and the available name Paraclodes guyanensis Desutter-Grandcolas, 1992 n. stat. is used for Paraclodes aptera (Chopard, 1912) as this name is preoccupied by Paraclodes aptera (Giglio-Tos, 1897). The tribe Aclodini Desutter-Grandcolas n. tribe is defined within the Paragryllinae Desutter, 1987 subfamily for the genera Aclodes Hebard, 1928, Paraclodes n. stat. and Uvaroviella Chopard, 1923, previously included in the Heterogryllina Hebard, 1928 (Phalangopsinae Blanchard, 1845, Phalangopsini Blanchard, 1845). The diversity of Guianese Phalangopsidae is discussed, and an updated identification key for Phalangopsidae crickets from French Guiana is proposed.