Macromalthinus luteoapicalis, Biffi & Constantin, 2018

Biffi, Gabriel & Constantin, Robert, 2018, A revision of Macromalthinus Pic, 1919 with description of six new species (Coleoptera: Cantharidae: Chauliognathinae), Papéis Avulsos de Zoologia (Pap. Avulsos Zool., S. Paulo) 58, pp. 1-22: 7-8

publication ID 10.11606/1807-0205/2018.58.58

persistent identifier

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scientific name

Macromalthinus luteoapicalis

sp. nov.

Macromalthinus luteoapicalis   sp. nov.

( Figs. 2 View Figures 1-6 , 8 View Figures 7-12 , 14 View Figures 13-18 , 20 View Figures 19-24 , 26 View Figures 25-30 , 32 View Figures 31-36 , 38 View Figures 37-42 , 44 View Figures 43-48 )

Type material: HOLOTYPE: ♂: BRAZIL. Mato Grosso: Gallery forest , 12°50’S, 51°47’W, 05.X.1968, O.W. Richards, R.S.& R.G.S. Exped. [Royal Society & Royal Geographical Society], B.M. 1968-240 ( BMNH) ( Fig. 2 View Figures 1-6 ) GoogleMaps   . PARATYPES (1 ♂, 2 ♀). BRAZIL. Mato Grosso: Gallery forest , 12°50’S, 51°47’W, 30.III.1968, O.W. Richards, R.S.& R.G.S. Exped., B.M. 1968-240 (1 ♂ BMNH) GoogleMaps   ; idem, 10.X.1968, O.W. Richards, R.S.& R.G.S. Exped., B.M. 1968-240 (1 ♀ BMNH) GoogleMaps   ; Chapada dos Guimarães, Parque Nacional da Chapada dos Guimarães, 15°25’46.7”S, 55°50’41.8”W, 03-13.XI.2008, Almeida, Fernandes, Kawada & Rosa col (1 ♀ MZSP) GoogleMaps   .

Differential diagnosis: Pronotum dark brown in the centre, clearing towards borders, margins and angles pale yellow; elytra dark brown, with yellowish to lightbrown apical patch; males: femur swollen, wider medially, with inconspicuous rounded ventral tooth; ventrite VIII with a short, oblique ridge near left margin; aedeagus with right prolongation of tegmen broadly projected dorsally; left setiferous prolongation elongate,wide,with short apical setae; females: abdominal ventrite VII short, wide,lateral margins arched,posterior angles emarginat- ed, posterior margin straight.

Males differ from M. belemensis   by the presence in the latter of fore femur with an inconspicuous rounded ventral tooth, distal margins of abdominal ventrite VII wider and aedeagus with left paramere present. Distal margin of ventrite VII of females straight (notched in M.belemensis   ).

Description: Length: 5.6-6.5 mm. Colouration: Head predominantly black, clypeus dark brown; antennae dark brown, testaceous on antennomeres I-III; labium and maxillae light brown, palpomeres light brown to testaceous; mandibles light brown at apex and pale yellow at base; pronotum dark brown at centre, clearing towards borders, margins and angles pale yellow; elytra dark brown with a yellowish to light-brown apical patch; wings dark brown; thorax and abdomen light brown; legs pale yellow to light brown, darker at apex of femora, tibiae and tarsi ( Fig. 2 View Figures 1-6 ).

Males: Head large, transverse, 1.2 times wider than pronotum; temples elongate, strongly tapering posteriorly; vertex and frons concave. Eyes bulging, oblong, prominent. Antennae filiform,flattened dorso-ventrally, densely covered with thin setae; antennomere I wide, II very short,III 0.6 times shorter than I, IV and V nearly as long as I, VI slightly longer than the following ones, progressively decreasing in length apically. Pronotum ( Fig. 8 View Figures 7-12 ) nearly as long as wide; anterior margin slightly arched,lateral margins slightly constricted near anterior angles, sinuate and convergent from anterior half; pronotal surface elevated antero-medially and near posterior angles, forming two lateral shallow grooves, parallel lateral margins, convergent posteriorly. Elytra short, rugulose, densely covered with short and thin setae;sutures dehiscent from posteri- or half; apex slightly swollen dorsally. Fore femur ( Fig. 14 View Figures 13-18 ) swollen, wider medially, with inconspicuous rounded ventral tooth; femora, tibiae and tarsomeres increasing in length from fore to hind legs; tarsal claws simple, not toothed. Abdominal tergites and sternites sclerotized; ventrites densely covered with long thin setae; glandular pores not prominent; distal margin of ventrite VI entire, not notched, slightly membranous; ventrite VII ( Fig. 20 View Figures 19-24 ) H-shaped,lateral margins sinuous,with a broad membranous area anteriorly and a wide posterior notch; ventrite VIII ( Fig. 26 View Figures 25-30 ) asymmetrical, irregularly oblong, strongly convex; a short,oblique ridge near left margin.Aedeagus ( Fig. 32 View Figures 31-36 ) with right prolongation of tegmen broadly projected dorsally, without apophysis on dorsal surface; left setiferous prolongation elongate, wide, with short apical setae; right paramere elongate, straight, apex acute, slightly curved; left paramere elongate, narrow, flat, apex rounded; median lobe straight, broad, apex membranous. Measurements of holotype: TL: 6.0; AL: 4.8; OL: 0.51; HW: 1.12; IOW: 0.57; IAW: 0.20; PL: 0.86; PW: 0.93; EL: 1.8; EW: 1.24. Length of each antennomere: aI: 0.3; aII: 0.18; aIII: 0.30; aIV: 0.43; aV: 0.45; aVI: 0.47; aVII: 0.47; aVIII: 0.48; aIX: 0.48; aX: 0.43; aXI: 0.46.

Female: Similar to males; eyes smaller, less prominent; fore femora slender, without intumescence or tooth; ventrite VI entire, not notched posteriorly; ventrite VII ( Fig. 38 View Figures 37-42 ) short, wide, lateral margins arched, anterior angles emarginated, posterior margin straight; coxites ( Fig. 44 View Figures 43-48 ) with base elongate, slender, apex very short, with a short, broad projection behind styles bearing few thin setae; styles short, slightly wider apically, bearing some setae of different thicknesses. Measurements of medium size female paratype: TL: 6.5; AL: 4.4; OL: 0.47; HW: 10.6; IOW: 0.52; IAW: 0.17; PL: 0.82; PW: 0.86; EL: 1.62; EW: 1.14. Length of each antennomere: aI: 0.37; aII: 0.21; aIII: 0.26; aIV: 0.4; aV: 0.42; aVI: 0.45; aVII: 0.45; aVIII: 0.42; aIX: 0.41; aX: 0.39; aXI: 0.44

Etymology: The specific epithet is derivative of the Latin words luteus (yellow) + apicalis (apex), referring to their yellow patches in the apex of elytra.

Distribution: Brazil (Mato Grosso state) ( Figs. 66-67 View Figures 66-69 ).

Locality description: The specimens were collected during an expedition held by the joint Royal Society & Royal Geographical Society ( United Kingdom) sponsorship in cooperation with the National Research Council of Brazil during 1967 and 1969. Brown (1970) describes the vegetation near the base camp, where the specimens were collected, as:“forest (mata), savanna (cerrado) and grassland (campo). The base camp was located near the southern boundary of the Amazonian mata, where, on the interfluves, close-canopied dry forest gives way to woodland cerrado, usually through a short transition of cerradão, a taller denser form of cerrado. In the valleys gallery forest follows the stream sides in both cerrado and dry forest. Campos, varying from shrub-free grassland (campo limpo), to grasslands with occasional trees (campo sujo), characterize valley slopes in the cerrado where soils are saturated in the wet season”. Fifty years later, little remains of the original vegetation, since the area is currently threatened by deforestation, extensive farming and livestock.


Sao Paulo, Museu de Zoologia da Universidade de Sao Paulo