A featherwing beetle without wings: re-discovery and second species of Rioneta (Coleoptera: Ptiliidae) from the Uluguru Mountains, Tanzania Author Grebennikov, Vasily V. text Zootaxa 2008 1732 45 53 journal article 49808 10.5281/zenodo.181365 054c3e51-58a4-477c-8ed3-cf546e522202 1175-5326 181365 Rioneta inexpectata sp. n. ( Figs 3, 4 ) Diagnosis. Differs from R. uluguruensis by markedly narrower body ( Figs 3, 4 ). FIGURES 16–22. Rioneta uluguruensis , details of morphology. 16—habitus, ventral, left legs omitted, aedeagus and metendosternite shown; 18—head, dorsal, antennomeres 2–11 omitted; 18—left fore-tarsus and tibia, ventral (separately shown enlarged bifurcate spine on apical part of tibia); 19—right hind leg, ventral (separately shown enlarged tarsus with two visible apical tarsomeres); 20—mouthparts (maxillae, mentum, and labium), ventral; 21—right antenna, dorsal; 22—clypeus, dorsal. Description. With the characters of the genus. Body length 1.07–1.19 mm (mean 1.13 mm , n=4), pronotal length 0.27–0.29 mm (mean 0.28 mm ; n=4); pronotal width 0.47–0.51 (mean 0.49; n=4); ratio pronotal width/ length 1.73–1.80 (mean 1.77; n=4). Material studied. Holotype (dry mounted on card, not sexed): “ Tanzania : Uluguru Mts., W slope between Tchenzema vil. and Lukwangule Plateau, H- 2200 m . Oct. 19–21, 2002 .V. Grebennikov leg.” ( MRAC ). Paratypes : 39 (of them 27 dry mounted on cards and 12 mounted on two Euparal microscope slides; with same data as the holotype ( MRAC , CNC ). Etymology. The specific epithet is the Latin adjective expectatus (= exspectatus ), - a, -um (awaited, looked for) negated by the prefix in and referring to the unexpected discovery of this species.