A revision of Peltariosilis Wittmer (Coleoptera: Cantharidae), a surprisingly diverse Amazonian radiation Author Biffi, Gabriel Author Geiser, Michael text Papéis Avulsos de Zoologia 2020 Pap. Avulsos Zool., S. Paulo 2020-03-04 60 16 1 26 http://dx.doi.org/10.11606/1807-0205/2020.60.special-issue.16 journal article 10.11606/1807-0205/2020.60.special-issue.16 1807-0205 4984973 3C128243-07E3-4435-A496-D8F50F68389E Peltariosilis amapaensis ( Wittmer, 1966 ) ( Figs. 1A , 3 , 5A , 8 A-D, 10A, 11A, 12A, 13A, 14A, 15A-D) Silis ( Peltariosilis ) amapaensis Wittmer, 1966: 414 ; Delkeskamp 1977: 286 . Peltariosilis amapaensis, Constantin 2010b: 16 , 2017: 61 . Type material examined: HOLOTYPE ♂ ( MZUSP 31226 ): “ HOLOTYPUS // Ex - coleÇão / M. Alvarenga // Oiapoque / Amapá – Brasil / V. 1959 / M. Alvarenga col. // Peltariosilis / amapaensis / Wittm./ det. W.Wittmer // MZSP 31226 ” ( Figs. 8 A-D) . PARATYPES ( 7 specimens ): same data as holotype ( 4 ♂ , MZUSP 31227-31230, 3 ♂ , NHMB ). Other material examined: “Oiapoque / Amapá , Brasil / V . 1959 / Alvarenga col. // Peltariosilis / amapaensis / ( Wittmer, 1966 ) / det. G. Biffi 2018 // MZUSP 31231” ( 1 ♂ , MZUSP 31231); “Serra Lombard / Limão / 19.8-1961 // BRASIL , AP / J. & B. Bechyné // Peltariosilis / amapaensis / ( Wittmer, 1966 ) / det. G. Biffi 2018 ” ( 2 ♂ , 1 ♀ , MPEG ); “Serra Lombard / Limão / 20.8-1961 // BRASIL , AP / J. & B. Bechyné // Peltariosilis / amapaensis / ( Wittmer, 1966 ) / det. G. Biffi 2018 ” ( 2 ♂ , MPEG ); “Serra Lombard / Limão / 28.8-1961 // BRASIL , AP / J. & B. Bechyné // Peltariosilis / amapaensis / ( Wittmer, 1966 ) / det. G. Biffi 2018 ” ( 1 ♂ , MPEG ); “Serra Lombard / Olemarque / 10.VIII.1961 // Brasil , AP / J. & B. Bechyné” ( 1 ♂ , BMNH );“ Guyane , station Nourages [Nouragues] / saut Pararé / 4˚01′N, 52˚41′W, 120m / 23.XI.2009 , piège vitre / P.Dalens, S. Brûlé, E.Poirie [Poirier] // Peltariosilis / amapaensis / Wittmer, 1966 / R . Constantin det.2016” ( 1 ♂ , CCo). Diagnosis: Antennomeres IX-XI narrower than preceding ones. Pronotum with very short laterobasal lobe, one lateral unciform spine, posterior portion with an acute pointing projection posteriorly; prediscal projections convex, broadly rounded, not meeting dorsal edge of laterobasal lobe. Scutellar projection short, trapezoidal, lamellar, slightly narrowed at apex, distal margin sinuat- ed, with three shallow rounded projections. Peltariosilis amapaensis is similar to P.lamellata , P.guyanensis , P.mensaemontis and P. diversicollis sp. nov. by the general aspect of pronotum. It differs from these species by the posterior margin of dorsal projections of pronotum with an acute pointing tip. Re-description: Head entirely black; maxillae and labium light brown, slightly darker on distal palpomeres; antennae mostly dark brown, slightly lighter at base of each antennomere, antennomeres I-II orangish to light brown; pronotum and scutellum light orange brown, slightly translucent; elytra dark brown, lighter at lateral margins; legs light orange brown, darker on the apex of tibiae and tarsi; thorax and abdomen dark brown, darker on last abdominal ventrite and tergite. Male: ( Fig. 5A ) Antennae short; antennomere I elongate, slightly wider apically,II short,slightly wider apically,III-IV nearly cylindrical, V-VIII flat at ventral surface and globose at dorsal surface, IX-XI slender, filiform. Pronotum ( Fig.10A ):frontolateral lobe narrow;laterobasal lobe very short, mostly concealed under dorsal projections, angles with lateral unciform spines, apex with an acute pointing projection posteriorly; dorsal projections very wide, internal margin concave, lateral and posterior margins broadly rounded with an acute pointing tip. Scutellum ( Fig. 12A ) with a short trapezoidal lamellar projection, wide at base, slightly narrowed at apex, distal margin sinuated, with three shallow rounded projections. Elytra divergent at lateral margins, wider posteriorly; apex truncate. Abdominal tergite VIII ( Fig. 13A ) subtrapezoidal, lateral margins convergent posteriorly, wider anteriorly; glandular pores slightly prominent; distal margin sinuous, with a small, shallow median notch. Ventrite VII ( Fig. 14A ) wide, lateral margins sinuous, broadly arched and wider anteriorly, convergent and constricted posteriorly; posterior margin arched; internal margins of medi- an incision nearly parallel. Aedeagus ( Fig. 15 A-D): ventral plaque of tegmen lateroventral, shorted than internal sac, flattened laterally, wider medially, apex acute, sinuous, gradually curved internally, apex curved externally; parameres broadly fused at base, divergent at apex, slightly flattened dorsoventrally, regularly curved dorsally, tips rounded; median lobe membranous, translucent; internal sac very elongate, directed dorsally; median dorsal sclerite absent; paramedian dorsal sclerites short and narrow, divergent, straight, apex slightly acute, directed dorsally; ventral sclerites very elongated, almost as long as internal sac, slender, straight, apex acute, slightly curved laterally; lateral sclerites as long as paramedian dorsal sclerites, robust, strongly sclerotised. Female: General appearance and colouration similar to males; antennae slender, simple, middle antennom- eres not distinctly globose; pronotum ( Fig. 11A ) without strong modifications; frontolateral lobe smaller, posteri- or margin arched; laterobasal lobe broad, oblique; dorsal projections absent; median and basal grooves shallow; ventrite VII with a small median notch on distal margin. Distribution: French Guiana , Brazil ( Amapá state ) ( Fig. 18 ).