Macromalthinus Pic, 1919

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 : 2-3

Macromalthinus Pic, 1919

( Figs. 1-65 )

Macromalthinus Pic, 1919: 14 ; Delkeskamp, 1939: 214; Blackwelder, 1945: 369; Miskimen, 1961: 24; Wittmer, 1963: 131; Magis & Wittmer, 1974: 93; Delkeskamp, 1977: 465; Brancucci, 1980: 298; Brancucci, 1981a: 259; Brancucci, 1981b: 331; Constantin, 2010: 40; Constantin, 2016: 5.

Type species: Macromalthinus maximiceps Pic, 1919 (by monotypy).

Diagnosis: Antennae filiform or slightly flattened, without strong modifications; head large, strongly narrowed posteriorly, vertex concave; eyes strongly developed, prominent; pronotum subquadrate to trapezoidal, constricted laterally near anterior angle; elytra short, exposing wings and abdominal tergites; elytra without sculptural modifications, apex round, slightly swollen; fore femur of males swollen, usually with a ventral tooth near apex; fore tibia slender, without modifications; tarsal claws simple,not toothed; abdomen of males with broad membranes between ventrites, ventrite VII H-shaped, broadly notched anteriorly and posteriorly, ventrite VIII convex, asymmetrical; aedeagus asymmetrical, median lobe elongate, curved; left paramere flat, partially covering dorsal surface of median lobe; right paramere entire, not divided or laterally projected; right prolongation of tegmen present, dorsal surface without apophysis; left setiferous prolongation present or absent.

Distribution: Trinidad and Tobago, French Guiana, Brazil, Ecuador and Peru.

Figures

Figures 1-6:Dorsal habitus ofMacromalthinus species.(1) M.guyanensis sp.nov.(2)M.luteoapicalissp.nov.(3)M.orapuensis sp.nov.(4) M.piceiventrissp.nov. (5) M.quadratithorax sp.nov.(6)M.xerophilus sp.nov.Scale bars:2.0 mm.

Figures 7-12: Pronotum of Macromalthinus species. (7) M. guyanensis sp. nov. (8) M. luteoapicalis sp. nov. (9) M. orapuensis sp. nov. (10) M. piceiventris sp. nov. (11) M. quadratithorax sp. nov. (12) M. xerophilus sp. nov. Scale bars:1.0 mm.

Figures 13-18: Fore femur of Macromalthinus species. (13) M. guyanensis sp. nov. (14) M. luteoapicalis sp. nov.(15) M. orapuensis sp.nov.(16) M. piceiventris sp.nov.(17) M. quadratithoraxsp.nov.(18) M. xerophilus sp.nov.Scale bars:0.5 mm.

Figures 19-24:Ventrite VII of males of Macromalthinus species.(19) M.guyanensis sp.nov.(20) M.luteoapicalis sp.nov.(21)M. orapuensis sp.nov.(22) M.piceiventris sp.nov.(23) M.quadratithorax sp.nov.(24) M.xerophilus sp.nov.Scale bars:0.5 mm.

Figures 25-30: Ventrite VIII of males of Macromalthinus species. (25) M. guyanensis sp. nov. (26) M. luteoapicalis sp. nov. (27) M. orapuensis sp.nov.(28)M.piceiventrissp.nov.(29) M.quadratithoraxsp.nov.(30) M.xerophilus sp.nov.Scale bars:0.5 mm.

Figures 31-36: Aedeagus of Macromalthinus species. (31) M. guyanensis sp. nov. (32) M. luteoapicalis sp. nov. (33) M. orapuensis sp. nov. (34) M. piceiventris sp.nov.(35) M. quadratithorax sp.nov.(36) M. xerophilus sp.nov. Abbreviations:pt = prolongation of tegmen, sp = setiferous prolongation,rp = right paramere, lp = left paramere,ml = median lobe.Scale bars:0.5mm.

Figures 37-42:VentriteVII offemales ofMacromalthinusspecies.(37) M.guyanensis sp.nov.(38)M.luteoapicalissp.nov.(39) M.orapuensissp.nov.(40)M.piceiventris sp.nov.(41) M. quadratithoraxsp.nov.(42) M. xerophilus sp.nov.Scale bars:0.5 mm.

Figures 43-48: Coxites of Macromalthinus species. (43) M. guyanensis sp. nov. (44) M. luteoapicalis sp. nov. (45) M. orapuensis sp. nov. (46) M. piceiventris sp. nov. (47) M. quadratithorax sp. nov. (48) M. xerophilus sp. nov. Scale bars:0.2 mm.

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 55-58: Macromalthinus maximiceps, female. (55) Ventrite VII. (56) Apex of abdomen, ventral view. (57) Coxite. (58) Left wing. Scale bars: 55-56:0.5 mm;57:0.2 mm; 58: 2.0mm.

Figures 59-65: Morphology of Macromalthinus brasiliensis. (59) Habitus of male, lateral view. (60) Abdomen of male, ventral view. (61) Live specimen, male. (62) Genitalorgans of female,lateral view.(63-65) Aedeagus,left,dorsal and right view.Abbreviations:ag = accessory gland,bc = bursa copulatrix,ov = oviduct, sp = spermatheca,v = vagina.