Diagnostics and updated catalogue of Acalyptris Meyrick, the second largest genus of Nepticulidae (Lepidoptera) in the Americas Author Stonis, Jonas R. Author Diškus, Arūnas Author Remeikis, Andrius Author Vargas, Sergio A. Author Solis, M. Alma text Zootaxa 2020 2020-03-06 4748 2 201 247 journal article 23708 10.11646/zootaxa.4748.2.1 e15a5b4c-9199-4679-afdf-1a08dd1cd564 1175-5326 3698667 CBB8899F-0DE8-491E-B6C1-468C2FDBE54C 44. Acalyptris extremus Stonis & Diškus , sp. nov . ( Figs 151–163 ) Diagnosis. External characters of A. extremus are not sufficient for species identification. In the male genitalia, the unique shape of valva with a strongly bulged inner lobe ( Fig. 156 ), and particularly two pairs of extremely developed horn-like processes ( Fig. 159 ) easily distinguish the new species from all known Acalyptris species. Description. Male ( Figs 151–154 ). Forewing length 2.1 mm ; wingspan 4.7 mm (n = 1). Head . Scape golden cream; frontal tuft orangish ochreous to ochre-brown; collar comprised of pale ochreous piliform scales; antenna slightly shorter than one-half length of forewing; flagellum ochreous cream with golden gloss on upper side and underside, with about 39 segments. Thorax. Tegula yellowish cream with some irregularly scattered brown scales; thorax yellowish cream with golden gloss; forewing yellowish cream with golden gloss and some sparsely scattered brown and dark brown scales prevailing in apical 1/3; fringe golden cream, without fringe line; forewing underside densely covered with pale grey-brown scales, with some purple iridescence; no androconia. Hindwing and fringe grey to yellowish cream (depending on angle of view), without androconia. Legs glossy, yellowish cream, with dark grey-brown scales on upper side. Abdomen . Fuscous on upper side, grey cream on underside; anal tufts inconspicuous; genital plates large, cream. Genitalia ( Figs 155–163 ) with capsule about 360 µm long, 240 µm wide. Valva with two pairs of extremely large processes ( Figs 156 , 159 ). Phallus about 290–330 µm long, with a large cathrema and unique carinae ( Figs 161–163 ). Female. Unknown. Bionomics . Host plant is unknown. Adults fly in June (one specimen was attracted to light). Otherwise, biology is unknown. FIGURES 138–145. Acalyptris spp. 138, A. basihastatus Puplesis & Diškus, 2002 ( first photographic documentation ), male adult, paratype (ZMUC); 139–141, same, male genitalia, slide no. AD0317 (ZMUC); 142, A. pseudohastatus Puplesis & Diškus, 2002 ( first photographic documentation ), male adult, paratype (ZMUC); 143–145, same, male genitalia, slide no. AD0319 (ZMUC). FIGURES 146–150. Acalyptris articulosus Puplesis & Diškus, 2002 ( first photographic documentation ). 146, male adult, paratype (ZMUC); 147, 150, male genitalia, slide no. AD0320, capsule (ZMUC); 148, 149, same, phallus (ZMUC). FIGURES 151–157. Acalyptris extremus Stonis & Diškus , sp. nov. , holotype (ZMUC). 151–154, male adult; 155–157, male genitalia, slide no. AD945. FIGURES 158–163. Male genitalia of Acalyptris extremus Stonis & Diškus , sp. nov. , holotype, genitalia, slide no. AD945 (ZMUC). 158, pseuduncus, uncus, and gnathos; 159, 160, capsule without phallus; 161–163, phallus. Distribution ( Fig. 1 ). Currently known from a single locality in Bolivia (Yungas: Coroico) at elevation about 1660 m ( Figs 6–8 ). DNA barcode. We barcoded the male holotype of the new species; the sequence is available at GenBank under voucher/sample ID MN982365 . Etymology. The species name is derived from the Latin extremus (extreme), in reference to the unique, extremely developed horn-like processes of valva in the male genitalia. Type material . Holotype : ♂ , BOLIVIA , Nor Yungas Province , Coroico , 16°12ꞌ25ꞌꞌS, 67°43ꞌ53ꞌꞌW, elevation 1660 m , at light, 15.vi.2018 , A. Diškus & J. R . Stonis , genitalia slide no. AD945 ( ZMUC ).