Gibboryctes endroedii Duarte and Grossi, 2022

Costa, Leidiane O., Duarte, Paulo R. M., Iannuzzi, Luciana & Grossi, Paschoal C., 2022, Taxonomic revision and notes on natural history of the enigmatic beetle genus Gibboryctes Endrödi (Coleoptera: Melolonthidae: Dynastinae), Journal of Natural History 56 (1 - 4), pp. 191-225 : 212-214

publication ID	https://doi.org/ 10.1080/00222933.2021.2017499
publication LSID	lsid:zoobank.org:pub:D766FC5E-CEC8-4184-BE90-C25350B90612
DOI	https://doi.org/10.5281/zenodo.6761928
persistent identifier	https://treatment.plazi.org/id/CF46879E-FFBC-FF88-FF55-706CFBC62848
treatment provided by	Plazi
scientific name	Gibboryctes endroedii Duarte and Grossi
status	sp. nov.

Treatment

Gibboryctes endroedii Duarte and Grossi , sp. nov.

( Figures 3 View Figure 3 ; 6 View Figure 6 (c); 7(c); 8(c); 9(b); 10 (c,d); 11(c); 12(e,f); 13(c); 14(b))

Diagnosis

Gibboryctes endroedii differs from other Gibboryctes species by the following combination of characters: body colouration reddish brown or dark reddish brown ( Figure 3 View Figure 3 ); labrum subtrapezoidal with broadly rounded apex ( Figure 6 View Figure 6 (c)); maxillae with lobed galea and stipe with a triangular lateral lobe ( Figure 8 View Figure 8 (c)); pronotal sides almost completely covered with large and coalescent punctures ( Figure 12 View Figure 12 (e)); elytral interstriae densely covered with large punctures ( Figure 12 View Figure 12 (f)).

Type material

Holotype male dissected, labelled: (a) ‘ Brasil, Minas Gerais, Lavras/Poço Bonito, 20.xi.2012 / 1060 m, Grossi & Parizotto /criação ninhos de cupim’ [white label]; (b) ‘ Gibboryctes endroedii sp. nov. / HOLOTYPE / Duarte & Grossi det. 2021’ [red label] ( CERPE). Two males and two females paratypes with same data as holotype ( CERPE). Two female paratypes, labelled: (a) ‘ Brasil, Minas Gerais, Ingaí / iii.2008, termiteiro chão/Vaz-de-Mello, ab. larva’ [white label]; ( CERPE). One female paratype, labelled: (a) ‘ Brasil, Minas Gerais, Ingaí / xi.2007, breed, Vaz-de - Mello leg’. [white label]; ( CEMT). One male paratype, labelled: (a) ‘ Brasil, Rio de Janeiro / Itatiaia , I.1947, A. Englir’ [white label]; ( CERPE). Paratypes with a yellow paratype label.

Holotype description

Male ( Figure 3 View Figure 3 ). Length: 24.6 mm. Width: 11.7 mm. Colour: Nearly completely reddish brown; protibial teeth black. Head: Clypeus triangular, transverse, 2 times wider than long, acuminate anteriorly, weakly narrowed laterally; lateral margin slightly raised; surface rugose, densely setose on sides separated by a glabrous middle area. Frontoclypeal suture with a transverse, flattened, short, subtrapezoidal tubercle. Frontal surface glabrous, transversely rugopunctate; punctures large, coalescent, C-shaped; interocular width equals 4.1 transverse eye diameter. Ocular canthus transverse, subtriangular, glabrous, with a small notch at lateroposterior outer corner. Mouthparts: Labrum subtrapezoidal, broadly rounded on apical margin ( Figure 6 View Figure 6 (c)). Mandibles with 2 teeth on outer margin; apical tooth subtriangular; basal tooth subrectangular, rounded apically, clearly larger in size compared to apical tooth ( Figure 7 View Figure 7 (c)). Maxillary galea lobed, widely rounded at apex ( Figure 8 View Figure 8 (c)); inner margin with 3 subapical teeth increasing in size towards apex; apical and basal teeth triangular; medial tooth lobed; inner margin rounded just below basal tooth; stipe expanded laterally in triangular shape ( Figure 8 View Figure 8 (c)). Maxillary palpomere II 1.6 times longer than width at middle. Labium subtriangular, slightly rounded laterally, becoming narrow towards apex; surface densely punctate; sides densely covered with long bristles; disc with scarce bristles, shorter than lateral compared to lateral bristles. Thorax: Pronotum rounded laterally in dorsal view, weakly convex in lateral view, longitudinal middle area slightly concave; anterior area with a small tubercle separated from anterior border by a deep groove; posterior pronotal border incomplete; pronotal surface almost entirely covered with ocellate punctures ( Figure 9 View Figure 9 (b)); punctures on sides deep, large, predominantly coalescent; longitudinal pronotal mid-line with a row of coalescent punctures; posterior areas on each side with shallow punctures scattered about 2 diameters of punctures. Scutellar plate subtriangular, scarcely punctate; punctures small, confined to anterior area. Elytra with 9 well-marked striae (1 sutural, 4 discal, 4 lateral); striae covered with a row of ocellate, deep, oval punctures; discal striae with contiguous punctures, gradually becoming smaller and sparser (about 1 diameter of punctures) towards posterior area; lateral striae with punctures scattered about 2 diameters of punctures, smaller compared to the discal striae; interstriae with punctures irregularly scattered, with mixed large and fine punctures. Legs: Mesotibial outer carinae with 11 stout spinules like setae (3 on basal carina, 8 on medial carina). Metatibia with 16 stout spinules like setae (6 on basal carina, 10 on medial carina). Abdomen: Tergite VIII with glabrous surface, strongly rugopunctate on lateral corners, densely punctate on discal area; punctures large, deep, from coalescent to contiguous on sides, becoming scattered about 1 diameter of punctures on disc. Ventrites I–VI rugopunctate on sides, finely punctate on discal area; ventrites II–V with an incomplete row of setigerous punctures near to posterior margin; ventrite VI glabrous, emarginate posteriorly at middle. Aedeagus: Parameres, in dorsal view, wide at basal half, becoming convergent towards a narrow apical half, covered with scarce bristles on inner edge of apex ( Figure 10 View Figure 10 (c)). Parameres, in lateral view, arched dorsally, ventrally with a longitudinal carina at middle, apex rounded, strongly constricted dorsoventrally ( Figure 10 View Figure 10 (d)).

Variation

Male paratypes. Length: 21.1–29.4 mm; Width: 11.0– 11.1 mm. As for holotype except the dark reddish brown colour; frontoclypeal tubercle bilobed; mandibles with lobed apical teeth; maxillae with 4 teeth at inner margin of galea; parameres widely divergent at basal half in dorsal view and with straight ventral surface in lateral view. Female paratypes. Length: 21.0– 23.37 mm; Width: 10.9–11.3 mm. As holotype except by the clypeus slightly rounded anteriorly ( Figure 11 View Figure 11 (c)); pronotum densely punctate compared to males ( Figures 11 View Figure 11 (c) and 12(e)); tergite VIII slightly convex in lateral view; ventrite VI parabolic, lacking posterior emargination ( Figure 13 View Figure 13 (c)).

Etymology

The specific epithet ‘ endroedii ’ is a homage to Dr Sebö Endrödi, author of the genus Gibboryctes and one of the greatest experts on Dynastinae in the twentieth century.

Geographic distribution ( Figure 14 View Figure 14 (b))

Brazil (Minas Gerais, Rio de Janeiro).

Remarks

Gibboryctes endroedii sp. nov. resembles G. szelenyii in the reddish-brown body colour and elytral interstriae densely covered with punctures mixed among small and shallow, and large and deep. Besides this, males of G. endroedii have variations in the shape of parameres that sometimes overlap those observed in G. szelenyii . However, G. endroedii sp. nov. is clearly distinct by the labrum parabolic in shape; maxillary galea rounded at apex with all teeth located subapically on the inner margin; anterior corners of pronotum covered with large and coalescent punctures. Gibboryctes szelenyii have triangular labrum; triangular maxillary galea with all teeth located at middle of inner margin; anterior corners of pronotum with contiguous punctures or spaced about 1 diameter of punctures.