Byrsopolis chassaini Soula, 2010a

Medeiros, Rone A. F., Seidel, Matthias & Grossi, Paschoal C., 2022, Revision of the genus Byrsopolis Burmeister, 1844 (Coleoptera: Melolonthidae: Rutelinae: Rutelini), with the description of six new species endemic to Brazil and Paraguay, Journal of Natural History (J. Nat. Hist.) 56 (29 - 32), pp. 1315-1364 : 1351-1354

Byrsopolis chassaini Soula, 2010a new junior subjective synonym

Byrsopolis chassaini, 2010a: 46 (original description); Carvalho and Grossi 2018: 372 (checklist, distribution); Hielkema and Hielkema 2019: 127 (checklist, distribution).

Type locality. Nouveau Chantier, Saint-Laurent-du-Maroni, French Guiana.

Type material. Byrsopolis aenescens Ohaus, 1926 : Lectotype male, dissected, here designated. (a) ‘ HOLOTYPUS / Byrsopolis / aenescens Ohaus 1926 /labelled by MHHUB 2010’ [red label], (b) ‘Oyapok Oberlf./Pied Saüt, III.1918 /’, (c) ‘ GUYANE FRANÇ SE/Nouveau Chantier/ COLLECTION LE MOULT’, (d) ‘Type’ [red label], (e) ‘ Byrsopolis /aenescens/Ohs’. [handwritten by Soula], (1♂ ZMHB) ( Figure 16 (a-b, d)); Byrsopolis chassaini Soula, 2010a : Holotype male, dissected. (a) ‘ Holotype / Byrsopolis / chassaini S./2010 Soula’ [red label, handwritten by Soula], (b) ‘Mussé des Confluences/MHNL/47030019’, (c) ‘Cacao/Guyane Fç./M Soula det 19’ [handwritten by Soula], (1♂ CCECL, specimen examined through images) ( Figure 16 (e–h)); (1♂).

Additional material. [ 15 specimens] (a) ‘ Guiana Francesa, Route de/St . George, Pk 125, 07./iii.2008, P.L. J.G./ Giúglaris Leg’ (1♂ CERPE) ( Figure 16 (c)); ‘ FRENCH GUIANA: Saül, Point / de Vue, Belvédère de Saul-/ Montagne Pelée, Saül, Colline /en lisière forêt et bourg de/ Saül, N 3°37 ʹ 22 ’ W 53°12 ʹ 58” ’ // ‘ 09.iii.2017 , PVB:/automatic light trap/(blue)’ // ‘ Byrsopolis aenescens / Ohaus, 1926 /det. M. Seidel 2021’ // ‘WORLD/SCARAB./ DATABASE/ WSD00347508’ (1♂ MSPC); same, except ‘ 19 .iv .2017, PVB:/automatic light trap/(blue)’ // ‘WORLD/SCARAB./ DATABASE/WSD00347509’ (1♂ MSPC); same, except ‘ 23 .iii .2017, PVB:/ automatic light trap/(blue)’ // ‘WORLD/SCARAB./ DATABASE/[WSD00347510- WSD00347512]’ (3♂ MSPC); same, except ‘ 17 .iii .2017, PVB:/automatic light trap/(blue)’ // ‘WORLD/SCARAB./ DATABASE/WSD00347513]’ (1♂ MSPC); same, except ‘ 06 .iv .2017, PVB:/ automatic light trap/(blue)’ // ‘WORLD/SCARAB./ DATABASE/[WSD00347517- WSD00347518]’ (2♂ MSPC); same, except ‘ 03 .iii .2017, PVB:/automatic light trap/(blue)’ // ‘WORLD/SCARAB./ DATABASE/WSD00347519’ (1♂ MSPC); ‘ FRENCH GUIANA: Piton/ Rocheux de l’Armontabo , Saint/Georges, Savane-roche,/sommet de l’inselberg (353 m),/ N 3°43 ʹ 56,1 ’ W 52°19 ʹ 11,9” ’ // 11 .ii .2018,/L.T: light trap’ // ‘ Byrsopolis aenescens / Ohaus 1926 /det . M . Seidel 2021’ // ‘WORLD/SCARAB./ DATABASE/WSD00347514’ (1♂ MSPC); same, except ‘ 16 .ii .2018,/L.T: light trap’ // ‘WORLD/SCARAB./ DATABASE/WSD00347515’ (1♂ MSPC); same, except ‘ 16 .ii .2018, PVP:/automatic light trap/(pink)’ // ‘WORLD/ SCARAB./ DATABASE/WSD00347516’ (1♂ MSPC) . No collection data.

Diagnosis. Body testacious-brown to reddish-brown, without metallic green reflections; clypeus subrectangular; antennal club about 1.97x longer than antennomeres II–VII combined; scutellar plate subtriangular, base weakly rounded; elytral apex with divergent angles; elytra with indistinct striae, humeri moderately punctate; protibial spur about 3.5x longer than wide; parameres symmetrical, weakly divergent; sides of parameres almost linear, basal margin with strong small emarginations.

Description. Male. Body. Oval, elongate; testaceous-brown to reddish-brown, only elytra and antennomeres testaceous-brown to dark orange ( Figures 16 (a), 17(a–c)), frontoclypeal suture black; reddish-brown setae on scutellar shield; without metallic green reflections. Lectotype. 27.00 mm. Elytral width 15.50 mm. Head. Clypeus about 2x wider than long; semioval; weakly concave only at marginal areas; frontoclypeal suture with weak curvilinear extremities; punctures small to moderate, moderately to densely punctate; frons about 1.50x longer than clypeus; punctures small to large, moderately punctate on base, densely punctate on apex; glabrous; mandibles with moderately rounded external border, scissorial region weakly rounded, with few and sparse setae on disc, base of scissorial region with short and dense setae, small, tooth-like projection on mesal internal border ( Figure 17 (e)); galea with four teeth, one long apical tooth, two median small toothlets, and one small basal tooth with a single seta ( Figure 17 (f)); apex of prementum moderately emarginate, with triangular lobes; last labial palpomere about 2.87x longer than palpomere II ( Figure 17 (g)); labrum weakly emarginate, moderately setose ( Figure 17 (h)); antennomere III subcylindrical, antennomeres IV–V subquadrate, antennomeres VI– VII subconical; antennal club about 1.97x longer than antennomeres II–VII combined. Thorax. Pronotum transverse, about 1.67x wider than long ( Figures 16 (a), 1616(a)); punctures small to moderate, moderately punctate at disc, densely punctate at marginal areas; one transverse line at apex formed by a small concavity on each side near anterior marginal areas; scutellar plate subtriangular, base weakly rounded ( Figure 17 (a)); small setae on apex, moderately distributed; punctures small to moderate, sparsely punctate at apex, moderately punctate at disc and base. Elytra. About 1.15x longer than wide; punctures small to moderately large, moderately punctate at disc and marginal areas; interstriae indistinct ( Figure 17 (a)); elytral apex with divergent angles; humeri with microsetae in moderate punctures, sparsely distributed. Legs. Protibial spur about 3.5x longer than wide; mesotibiae with one carina and metatibiae with two carinae. Aedeagus. Parameres apex rounded, weakly sinuous, moderately divergent, symmetrical; acute angle between parameres; parameres wide ( Figures 16 (b-c), 17(d)); lateral margins without excavation or carina; proximal margin with strong small emarginations; longitudinal midline concave at apex; glabrous.

Female. Unkown.

Variation. Length 23.10–28 mm. Humeral width 10.50–13.50 mm. Elytral width 13.15– 17.00 mm.

Etymology. The specific epithet in latin is ‘aenescens’, which means bronze-coloured.

Distribution. Byrsopolis aenescens can be found only in French Guiana in the cities of Saint-Laurent-du-Maroni, Cacao, Saül, Saint-Georges.

Remarks. Byrsopolis aenescens differ from B. ferrandi in the following: apex of prementum with moderate emargination (strong emargination); labrum weakly emarginated (moderately emarginated); protibial spur 3.5x longer than wide (2.80x longer); mesotibia with one carina (two carinae); elytral apex with divergent angles (right angles).

Figures

Figure 16. Byrsopolis spp. Dorsal habitus of Byrsopolis aenescens, Ohaus,holotype (a), dorsal and lateral view of aedeagus (b–c), and labels attached (d); dorsal habitus of Byrsopolis chassini Soula, holotype (e), dorsal and lateral view of aedeagus (f–g), and labels attached (h); dorsal habitus of Byrsopolis ferrandi Soula, holotype (i), dorsal and lateral view of aedeagus (j–l), and labels attached (m). Images from Olivier Garcin and Cédric Audibert (e–m).

Figure 17. Byrsopolis aenescens Ohaus. Dorsal (a), lateral (b), and ventral habitus (c); caudal view of aedeagus (d); dorsal view of left mandible (e), ventral view of right maxilla (f), ventral view of mentum (g), dorsal view of labrum (h). Scale bars:a–c = 5 mm; d–h = 1 mm.