A revision of Discodon tricolor (Guérin-Méneville) and its mimics from the Atlantic forests of Brazil (Coleoptera: Cantharidae) Author Biffi, Gabriel 1F5A526D-13F0-4A33-AA33-D9B7497E5689 Museu de Zoologia da Universidade de São Paulo, Av. Nazaré, 481 - Ipiranga, 04263 - 000, São Paulo, SP, Brazil. biffigabriel@gmail.com Author Geiser, Michael 87D6F91C-542C-45D4-8E5F-9B02CAA86424 Department of Life Sciences, Natural History Museum, Cromwell Road, SW 7 5 BD, London, United Kingdom. m.geiser@nhm.ac.uk text European Journal of Taxonomy 2022 2022-08-23 834 1 148 189 http://zoobank.org/c2df7ac2-3d99-43ff-bb36-cef8e8747160 journal article 128209 10.5852/ejt.2022.834.1907 4f68488a-f211-42a1-9d8f-bf3d815946e0 2118-9773 7017677 C2DF7AC2-3D99-43FF-BB36-CEF8E8747160 Discodon lineaticorne sp. nov. urn:lsid:zoobank.org:act: 66D5B02D-DAD1-47BB-A93E-0981BECD4BB7 Figs 3C , 6E, P , 7E , 8E , 9E , 10E , 12A–C , 15E Diagnosis Differs from other species in the region by the entirely black antennae ( Fig. 3C ), the males with antennomeres IX–XI with short longitudinal lines dorsally ( Fig. 6E ), ventrite VII with apices truncate ( Fig. 10E ), aedeagus ( Fig. 12A–C ) with three distal projections on distal margin of tegmen, the central projection very long and curved ventrally; females with last ventrite (VII) ( Fig. 15E ) broadly rounded with a pair of acute projections medially. Etymology The epithet lineaticorne refers to the longitudinal antennal lines on antennomeres IX–XI of the males. Type material Holotype BRAZIL • ♂ ; São Paulo , Pindamonhangaba , Eugênio Lefèvre ; 28 Sep. 1962 ; Exp. Dep. Zool leg.; MZSP 46436 ( Fig. 3C ). Paratypes (10 specimens) BRAZIL • 1 ♀ ; Minas Gerais , Itamonte , Instituto Alto Montana ; 22º21′13″ S , 44º47′57″ W , 5–6 Nov. 2019 ; UC. Entomologia UNIFESP leg.; Malaise ; MZSP 46444 • 1 ♀ ; São Paulo , Campos do Jordão ; 22º40′51.4″ S , 45º35′30.5″ W ; 1461 m a.s.l. ; Oct.–Nov. 2019 ; S.P. Rosa leg.; MZSP 46445 • 1 ♂ ; same collection data as for preceding; 1–13 Oct. 2018 ; MZSP 46446 • 1 ♀ ; same collection data as for holotype; DZUP 320982 • 1 ♂ ; same collection data as for preceding; 26 Oct. 1962 ; MZSP 46438 • 1 ♀ ; same collection data as for preceding; 1200 m a.s.l. ; 21 Dec. 1962 ; MZSP 46439 • 1 ♂ , 3 ♀♀ ; São Paulo , Ipiranga ; Oct. 1908 ; Luederwaldt leg. ‘20371’ [Luederwaldt’s collection record]; MZSP 46440 to 46443 . Description Body length: 13.0– 14.3 mm . Coloration ( Fig. 3C ): head pitch black, lustrous, except in lateral corners of clypeus, light brown; mandibles light brown, darker at base and tip; maxillary and labial palpi dark brown to black, light brown at apex of last palpomeres; antennae entirely black. Pronotum ( Figs 7E , 8E ) lustrous, partly translucent, with broad irregular black band from anterior to posterior margin, wider anteriorly and near posterior margin, and narrower near anterior half; from median band, a pair of diagonal black bands; background pale yellow to light orange with barely defined orange patches. Scutellum and elytra pitch black, slightly lustrous; at mid-length of each elytron, large whitish to pale yellow round spot nearly reaching lateral borders but not meeting at suture. Thorax, legs and abdomen dark brown to black, tarsal claws brown. Male ( Fig. 3C ) Head short, nearly as long as wide, excluding eyes; integument smooth, densely covered with short and fine yellow setae; frons short, vertex flat, occipital region convex, broadly rounded behind eyes. Clypeus flat, anterior margin emarginate, slightly projected anteriorly with median incision. Eyes large, rounded, prominent. Mandibles falciform, acute, without accessory teeth. Last maxillary and labial palpomeres securiform. Antennae ( Fig. 6E ) long, slightly flattened dorsoventrally; antennomeres III– IX wider distally, sub-serrate; antennomeres IX–XI with short longitudinal lines dorsally. Pronotum ( Fig. 7E ) wide, about 1.5 times as wide as long; usually, anterior margin slightly arched, almost straight in middle, anterior angles arched; lateral margins slightly sinuate, with shallow notch at posterior third; anterior, posterior and lateral margins elevated; integument smooth, densely covered with very fine yellow setae. Elytra long, each elytron 5 times as long as wide, almost parallel; integument coriaceous, densely covered with short and fine decumbent setae, and much longer thick erect setae. Legs slender, densely pubescent, covered with long and thick setae; tarsi flattened dorsoventrally, fourth tarsomere with transversal slit at base; anterior prothoracic tarsal claws ( Fig. 9E ) broadly lobed basally, lobe with rounded margin; posterior claws on meso- and metathoracic tarsal claws apparently split at apex, with fine protruding tooth slightly shorter than claws. Abdomen weakly sclerotised, coriaceous, densely covered with long setae; ventrite VI deeply notched at posterior margin, V-shaped, lateral apices arched; ventrite VII ( Fig. 10E ) with parallel-sided lobes, distal margins truncate; ventrite lobes concave, internal margins directed ventrally.Aedeagus ( Fig. 12A–C ): ventral wall of tegmen long and broad, apical margin convergent, forming a pair of lateral projections with truncate apices and very long central projection, strongly curved ventrally and with hook-like apex, usually visible between lobes of ventrite VII; fringe of long setae along lateral margins of tegmen dorsally; parameres robust, long and broad, parallel, apex acute; median lobe short, membranous, partially retracted behind parameres. Fig. 5. Primary types, habitus and labels. A–C . Discodon albonotatum obscurior Pic, 1906 (lectotype, ♀, MNHN EC13554), dorsal habitus, ventral view and labels. D . Discodon tenuecostatum sp. nov. (holotype, ♂, MZSP 46459). E–G . Discodon nigrocephalum Pic, 1949 (lectotype, ♂, MNHN EC13556), dorsal habitus, ventral view and labels. Photographs A–C and E–G by Christophe Rivier (MNHN, Paris). Scale bars = 5.0 mm. Female Similar to male; antennae ( Fig. 6 ) shorter, without longitudinal lines; pronotum wider, 1.6 times as wide as long, lateral margins without notches; tarsal claws without basal lobe or apical slit; ventrite VI not notched, distal margin slightly arched, concave; ventrite VII broad, lateral and distal margins broadly arched, distal margin with two long apical lobes projecting posteriorly at middle and U-shaped medial notch. Distribution Brazil ( Minas Gerais and São Paulo states) ( Fig. 16 ).