Discodon marginicolle, Biffi & Geiser, 2022

Biffi, Gabriel & Geiser, Michael, 2022, A revision of Discodon tricolor (Guérin-Méneville) and its mimics from the Atlantic forests of Brazil (Coleoptera: Cantharidae), European Journal of Taxonomy 834 (1), pp. 148-189 : 165-166

publication ID

https://doi.org/ 10.5852/ejt.2022.834.1907

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persistent identifier


taxon LSID


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scientific name

Discodon marginicolle

sp. nov.

Discodon marginicolle sp. nov.


Figs 3E View Fig , 6G, R View Fig , 7G View Fig , 8G View Fig , 9G View Fig , 10G View Fig , 12G–I View Fig , 15G View Fig


Similar to D. neoteutonum sp. nov. by the shape and coloration of the elytral spots. It differs from this species by the antennae being entirely black ( Fig. 3E View Fig ), with the antennal lines in males ( Fig. 3G View Fig ), the pronotum almost entirely black ( Figs 7G View Fig , 8G View Fig ), and the aedeagus with distal margin of the tegmen with three projecting lobes ( Fig. 12G–I View Fig ); females with ventrite VII broad, with a sinuous distal margin and a less pronounced median projection ( Fig. 15G View Fig ). The aedeagus of D. marginicolle sp. nov. is similar to that of D. aurimaculatum sp. nov., differing in the shape of the distal projections of the ventral wall of the tegmen; besides, the antennae of D. aurimaculatum do not have antennal lines and the elytral spots are rounder.


The specific epithet refers to the barely defined dark-orangish spot in the margin of the pronotum.

Type material

Holotype BRAZIL • ♂; Rio de Janeiro, Nova Friburgo, Macaé de Cima ; Jan. 2000; P. Grossi leg.; CEMT CUIABA 00118359 ( Fig. 3 E View Fig ).

Paratypes (4 specimens) BRAZIL • 1 ♂; same collection data as for holotype; MZSP 46458 View Materials 2 ♀♀; Nova Friburgo, Mury ; 1050 m a.s.l.; Mar. 1941; NHMB 1 ♀; Terezópolis ; Jan. 1980; A. Bello leg.; CEMT CUIABA 00118360 .


Body length: 11.0–13.0 mm. Coloration ( Fig. 3E View Fig ): head pitch black, lustrous, except in corners of clypeus, dark brown; mandibles dark brown, darker at tip; maxillary and labial palpi black and antennae entirely black. Pronotum ( Figs 7G View Fig , 8G View Fig ) lustrous, mostly black, except for orangish to dark brown irregular patches near anterior and posterior angles. Scutellum and elytra pitch black; at mid-length of each elytron, large sulphur to greyish hemispheric to triangular spot nearly reaching lateral borders but not meeting at suture. Thorax, legs and abdomen pitch black, tarsal claws dark brown.

Male ( Fig. 3E View Fig )

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, with a pair of lobes slightly projected anteriorly. Eyes small, rounded, prominent. Mandibles falciform, acute, without accessory teeth. Last maxillary and labial palpomeres securiform. Antennae ( Fig. 6G View Fig ) sub-serrate, slightly flattened dorsoventrally; antennomeres III–VI wider distally, the latter nearly parallel, antennomere XI narrowing apically; antennomeres IX– XI with short longitudinal lines dorsally. Pronotum ( Fig. 7G View Fig ) about 1.1 times as wide as long; anterior margin slightly arched, anterior angles rounded; lateral margins with shallow notch at posterior third, pronotum wider near notch; integument smooth, densely covered with very fine clear setae. Elytra long, each elytron about 5.5 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. 9G View Fig ) with pointing tip, broadly lobed basally, lobe with rounded margin; posterior claws on meso- and metathoracic tarsal claws apparently split at apex, with fine protruding tooth shorter than claws. Abdomen weakly sclerotised, coriaceous, densely covered with long setae; ventrite VI broadly concave at posterior margin; ventrite VII ( Fig. 10G View Fig ) elongate, halves triangular, internal margins straight, lateral margins arched, apices rounded. Aedeagus ( Fig. 12G–I View Fig ): ventral wall of tegmen elongate, apical margins convergent, forming a pair of parallel lateral projections with acute apices and central projection, strongly curved ventrally and with acute hook-like apex; fringe of long setae along lateral margins of tegmen dorsally; parameres very short, hidden between tegmen and median lobe; median lobe long, conical, membranous, with a pair of strong sclerites, each with double acute apices; sides of median lobe with a tuft of thick spine-like setae.


Similar to male; antennae ( Fig. 6 View Fig ) shorter, antennomeres broader, without antennal lines; pronotum ( Fig. 8 View Fig ) trapezoidal, broader, 1.6 times as wide as long, lateral margins sinuate, without notches; tarsal claws without basal lobe or apical slit; ventrite VI with distal margin slightly arched, concave; ventrite VII ( Fig. 15G View Fig ) broad and short, distal margin sinuous, with a broad medial lobe projecting posteriorly.


Brazil (Rio de Janeiro state) ( Fig. 16 View Fig ).


Brazil, Sao Paulo, Sao Paulo, Museu de Zoologia da Universidade de Sao Paulo


Switzerland, Basel, Naturhistorisches Museum


Natural History Museum Bucharest













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