Macromalthinus santaremensis Brancucci, 1981

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 : 18

Macromalthinus santaremensis Brancucci, 1981 ( Fig. 53 )

Macromalthinus santaremensis Brancucci, 1981a: 264 .

Material examined: HOLOTYPE ♂: [ BRAZIL, Pará] Santarém ( NHMB) ( Fig. 53 ).

Differential diagnosis: Head black; pronotum pale yellow, elytra black with apical yellow patches; males: fore femur swollen, with a distinct acute ventral tooth on distal third; aedeagus with right prolongation of tegmen broadly projected dorsally; left setiferous prolongation short; right paramere present.

Macromalthinus santaremensis differs from M. maximiceps and M.belemensis by the presence of right paramere. It differs from the other Amazonian species by truncate ventral tooth on fore femur of males.

Distribution: Brazil (Pará state) ( Fig. 66 ).

Remarks: Species described on a single male labelled ‘ Brésil, Santarem’, preserved in NHMB. No other specimens are known so far. The holotype lacks some tarsi and last antennomeres. The specimens collected in French Guiana, initially named as M. santaremensis by Constantin (2016), are similar to the male holotype in the body shape and genitalia, but additional material reveals new elusive characters leading to the description of M. guyanensis n. sp. and M. orapuensis n. sp.

Figures

Figures 49-54: Type specimens of Macromalthinus species. (49) M. belemensis Brancucci,1981 (holotype, MPEG).(50) M. brasiliensis (Pic,1906) (= Maronius brasiliensis Pic,1906 (lectotype,MNHN).(51) M. globuliventris Brancucci,1981 (paratype,NHMB).(52) M. maximiceps Pic,1919 (lectotype,MNHN).(53) M.santaremensis Brancucci,1981 (holotype,NHMB).(54) M.schmidli Constantin,2010 (holotype,NHMB).Scale bars:2.0 mm.

Figures 66-69: Distribution of Macromalthinus species. (66) Distribution of Macromalthinus species in South America. (67) Distribution of M. brasiliensis in Brazil.(68)Distribution ofM.maximiceps inFrench Guiana.(69)Distribution of M.guyanensis sp.nov.,andM.orapuensis sp.nov.inFrench Guiana.Background maps of Figs.66-67 by NaturalEarth (available at:www.naturalearthdata.com), and Figs.68-69 byEric Gaba.