Macromalthinus guyanensis, 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 : 3-6

publication ID	https://doi.org/ 10.11606/1807-0205/2018.58.58
publication LSID	lsid:zoobank.org:pub:97C262C2-6F02-4916-9533-43653FE5561F
persistent identifier	https://treatment.plazi.org/id/03821672-FFDC-1D41-53C1-FA31F86EFC2C
treatment provided by	Valdenar
scientific name	Macromalthinus guyanensis
status	sp. nov.

Treatment

Macromalthinus guyanensis sp. nov.

( Figs. 1 View Figures 1-6 , 7 View Figures 7-12 , 13 View Figures 13-18 , 19 View Figures 19-24 , 25 View Figures 25-30 , 31 View Figures 31-36 , 37 View Figures 37-42 , 43 View Figures 43-48 )

Type material: HOLOTYPE: ♂: FRENCH GUIANA:“Guyane franÇaise, Massif de Mitaraka , camp DZ, 02°14’4”N, 54°27’2”W, 25.III.2015, alt. 310 m, Malaise trap Slam, P.H. Dalens, E. Poirier & A. Mantilleri leg. / expédition La Planète Revisitée, MNHN-PNI Guyane 2015, autorisation APA 973-1” ( MNHN) ( Fig. 1 View Figures 1-6 ) GoogleMaps . PARATYPES (6 ♂, 37 ♀). FRENCH GUIANA. Massif de Mitaraka , 02°14’4”N, 54°27’2”W, 25.II.2015, light trap on dropping zone, J. Touroult, E. Poirier & J.H. Yvinec (1 ♂ MNHN) GoogleMaps ; idem, 01.III.2015, malaise Slam (2 ♀ MNHN) GoogleMaps ; idem, 02.III.2015, malaise 6 m, (1 ♀ MNHN, 1 ♀ CCo) GoogleMaps ; idem, 06.III.2015, malaise Slam (4 ♀ MNHN, 1 ♀ CCo) GoogleMaps ; idem, 12.III.2015, malaise Slam, P.H. Dalens, E. Poirier & A. Mantilleri (1 ♀ MNHN) GoogleMaps ; idem, 25.III.2015, malaise Slam (1 ♀ MNHN) GoogleMaps ; idem, Sommet en Cloche , 02°13’41”N, 54°28’05”W, 24.III.2015, malaise Slam (1 ♀ MNHN, 1 ♀ CCo) GoogleMaps ; Maripasoula , Mont Tabulaire Itoupé, 20-30.III.2010, UV light trap on drop zone, alt. 570 m, J. Touroult & SEAG (1 ♂ CCo) ; idem, 03°01’19”N, 53°05’03”W, alt. 800 m, 02.XII.2014, malaise Slam, P.H. Dalens & SEAG (1 ♀ MNHN) GoogleMaps ; idem, 07.I.2016, PL (1 ♀ CCo) GoogleMaps ; idem, 16.I.2016, malaise 6 m (1 ♂ CCo) GoogleMaps ; Saint- Elie , Réserve Trinité, savane-roche de la Haute-Kouribso, 04°19’N, 53°17’W, alt. 210 m, 25.X.2013, P.H. Dalens & J. Touroult (1 ♂ CCo) GoogleMaps ; Mana , Laussat 3 km W, 05°28’N, 53°35’W, 20.V.2010, malaise, G. Lamarre (1 ♀ CCo) GoogleMaps ; idem, 28.V.2010 (1 ♀ CCo) GoogleMaps ; idem, 04.VI.2010 (1 ♀ CCo) GoogleMaps ; idem, 07.X.2010 (1 ♀ CCo) GoogleMaps ; Risquetout , 8 km W, 04°55.097’N, 52°33.121’W, 45 m, MV light, 15.IV.2007, D.G. Hall & J.E. Eger coll. (1 ♂ FSCA) GoogleMaps ; Macouria , forêt littorale de Maya, 04°57’19”N, 52°27’37”W, 19.XII.2015, malaise 6 m, P.H. Dalens, F. Robin & F. Sonzogny (2 ♀ CCo) GoogleMaps ; Roura , route de Kaw, PK 6, 28.VIII.2010, alt. 180 m, sweeping the understorey, R. Constantin (1 ♀ CCo) ; Roura , Montagne des Chevaux, 06.XII.2009, window trap, S. Brûlé, P.H. Dalens & E. Poirier (1 ♀ CCo) ; idem, 13.XII.2009 (1 ♀ CCo) ; idem, 09.I.2010 (1 ♀ CCo) ; idem, 20.II.2010 (1 ♀ CCo) ; idem, 09.II.2010 (2 ♀ CCo) ; idem, 17.III.2010 (1 ♀ CCo) ; idem, 10.IV.2010 (1 ♀ CCo) ; idem, 19.XII.2010 (1 ♀ CCo) ; idem, 26.XII.2010 (1 ♀ CCo) ; Régina , Station des Nouragues, Saut Pararé, 03.IX.2009, malaise, S. Brûlé, P.H. Dalens & E. Poirier (1 ♀ CCo) ; idem, 23.XI.2009, PV (2 ♀ CCo) ; idem, 19.II.2010, malaise (1 ♀ CCo) .

Differential diagnosis: Head and elytra entirely dark brown; pronotum predominantly dark brown, yellowish near basal angles; males with acute, sharp tooth at distal third of fore femur;ventrite VIII without notches or ridges, with thin apical setae; aedeagus with right prolongation of tegmen truncate, separated from left setiferous prolongation by a narrow notch; left setiferous prolongation short and broad, covered with short thick setae; females: distal margin of ventrite VII straight, not prominent.

Males differ from M. maximiceps and M. orapuensis sp. nov. in terms of shape and position of femoral tooth, and by the abdominal ventrite VII medially longer and aedeagus with a less prominent right prolongation of tegmen.

Description: Length: 6.3-8.6 mm. Colouration: Head black; antennae brown, antennomeres I-II pale yellow ventrally, brown dorsally; maxillary and labial palpi brownish yellow, last palpomere brown; pronotum dark brown, yellowish near posterior angles; elytra and scutellum dark brown; legs dark brown, except coxae and base of femora, yellow; abdomen black ( Fig. 1 View Figures 1-6 ). The colour pattern of the type series from Mitaraka and from Mont Itoupé is slightly variable, mostly with dark brown pronotum, two slight yellowish-brown patches near posterior angles. On the costal series collected at Roura and nearby localities, half of specimens has dark pronotum, while the other half has a pronotal pattern of black medi- an strip surrounded by two narrow to wide yellow sidebands.

Male: Head large, 1.34 times wider than pronotum; temples elongate, strongly narrowed posteriorly; frons deeply depressed between eyes. Eyes strongly developed, bulging, internal margins converging frontwards. Antennae filiform, slender, antennomeres not compressed dorso-ventrally; antennomere I dilated, 3 times longer than broad. Pronotum ( Fig. 7 View Figures 7-12 ) as long as wide; anterior margin regularly arched; posterior margin arched medially, straight laterally near posterior angles; lateral margins straight, parallel at base, regularly tapering frontwards, constricted near anterior angles; pronotal margins thinly bordered, stronger near anteri- or and posterior angles; pronotal surface dull, not punctate, with thin, whitish pubescence. Elytra short, thinly punctate, slightly wrinkled, covered with thin whitish setae, obliquely bent backwards; sutures broadly dehiscent from basal third; apex narrower, swollen dorsally, lustrous. Fore femur ( Fig. 13 View Figures 13-18 ) with obtuse ventral tooth near apex; femora, tibiae and tarsomeres increasing in length from fore to hind legs; tarsal claws simple, not toothed. Abdominal tergites and ventrites broadly sclerotized; glandular pores slightly prominent; apical margin of tergite VIII broadly concave; lateral margins extended by a short conical projection; tergite IX longer than wide, asymmetrical, longer on its right side; ventrite VI broadly and deeply notched, membranous posteriorly; ventrite VII ( Fig. 19 View Figures 19-24 ) H-shaped, lateral margins slightly arched from apical half, deep and wide membranous area anteriorly, wide and broadly arched notch posteriorly, apical margins rounded laterally; ventrite VIII ( Fig. 25 View Figures 25-30 ) broadly convex, asymmetrical, without notches or ridges, with thin apical setae. Aedeagus ( Fig. 31 View Figures 31-36 ): right prolongation of tegmen truncate, short, weakly oblique, dorsal surface without apophysis, separated from left setiferous prolongation by a narrow notch; apical margin covered with short thick setae; left setiferous prolongation short, broad, covered with short, thick setae; right paramere short, broad, lateral margins parallel; left paramere flat, wider at base, apex rounded, partially covering dorsal surface of median lobe; median lobe wider basally, broadly membranous apically. Measurements of holotype: TL: 8.2; AL: 5.6; HW: 1.18; IOW: 0.42; IAW: 0.15; OL: 0.63; PL: 0.9; PW: 0.88; EL: 1.76; EW: 1.14. Length of each antennomere: aI: 0.55; aII: 0.19; aIII: 0.39; aIV: 0.57; aV: 0.6; aVI: 0.62; aVII: 0.6; aVIII: 0.57; aIX: 0.54; aX: 0.5; aXI: 0.5.

Female: Differs from male in having narrower head, eyes smaller, shorter; inter-antennal space wider, frons feebly depressed between eyes;first antennomere slightly swollen, 3.6 times longer than broad, fore femora simple, not toothed; tergite VIII distinctly emarginated apically; ventrite VI entire, not notched; ventrite VII ( Fig. 37 View Figures 37-42 ) subrectangular, lateral margins arched, distal angles rounded, slightly projected straight distal margin; coxites ( Fig. 43 View Figures 43-48 ): base long, slender, apex very short, broad projection behind styles bearing thin setae; styles fusiform, constrict- ed at base, bearing thick, long setae. Measurements of medium size female paratype: TL: 7.5; AL: 5.4; HW: 1.12; IOW: 0.58; IAW: 0.22; OL: 0.53; PL: 0.92; PW: 0.94; EL: 1.76; EW: 1.36.

Etymology: The name refers to the locality ( French Guiana) where the holotype was collected.

Distribution: French Guiana ( Figs. 66, 69 View Figures 66-69 ).

Natural history: Most of the specimens were collected with interception traps, either during daytime with malaise and windows traps, or at light traps. Only one specimen was collected by sweeping the understorey. This species is widespread in French Guiana and reaches the banks of boundary rivers Maroni and Oyapoc.