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

Abstract

The tribe Amorphopini Günther, 1939 is reviewed. It consists of two genera: Amorphopus Seville, 1838 and Eomorphopus Hankock, 1907 with three Neotropical species: Amorphopus notabilis Serville, 1838, Eomorphopus antennatus (Bolívar, 1887), and Eomorphopus granulatus Hancock, 1907. Two species are transferred from Amorphopus to the genera Metrodora Bolívar, 1887 and Crimisus Bolívar, 1887, and two new combinations are proposed: Metrodora gibbosula (Walker, 1871), comb. nov. and Crimisus humeralis (Walker, 1871), comb. nov. New synonyms are proposed: Amorphopus notabilis Serville, 1838 = Amorphopus griseus Bolívar, 1887, syn. nov.; Metrodora gibbosula (Walker, 1871) = Platytettix reticulatus Hancock, 1906, syn. nov.; and Crimisus humeralis (Walker, 1871) = Allotettix bolivianus Brunner, 1913, syn. nov. Neotypes of Amorphopus notabilis and Eomorphopus antennatus as well as the lectotype of E. granulatus are designated. The description of Amorphopus testudo Saussure, 1861 is based on an immature specimen and we considered it as nomen dubius and the type depository of Eomorphopus purpurascens 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.