Review of the tribe Amorphopini (Orthoptera: Tetrigidae: Metrodorinae): Pygmy moss-lichen tetrigids from the Amazon rainforest

The tribe Amorphopini Gunther, 1939 is reviewed. It consists of two genera: Amorphopus Seville, 1838 and Eomorphopus Hankock, 1907 with three Neotropical species: Amorphopusnotabilis Serville, 1838, Eomorphopusantennatus (Bolivar, 1887), and Eomorphopusgranulatus Hancock, 1907. Two species are transferred from Amorphopus to the genera Metrodora Bolivar, 1887 and Crimisus Bolivar, 1887, and two new combinations are proposed: Metrodoragibbosula (Walker, 1871), comb. nov. and Crimisushumeralis (Walker, 1871), comb. nov. New synonyms are proposed: Amorphopusnotabilis Serville, 1838 = Amorphopusgriseus Bolivar, 1887, syn. nov.; Metrodoragibbosula (Walker, 1871) = Platytettixreticulatus Hancock, 1906, syn. nov.; and Crimisushumeralis (Walker, 1871) = Allotettixbolivianus Brunner, 1913, syn. nov. Neotypes of Amorphopusnotabilis and Eomorphopusantennatus as well as the lectotype of E.granulatus are designated. The description of Amorphopustestudo Saussure, 1861 is based on an immature specimen and we considered it as nomen dubius and the type depository of Eomorphopuspurpurascens is unknown so we considered it, too, as nomen dubius. The tribe Amorphopini and all included taxa were redescribed and illustrated. A key to the genera and species is provided. Data on distribution, behavior, camouflage with lichens, polychromy, as well as ecological aspects of the species are reported.