Gilletianus miurai Minkina, 2022

Minkina, Łukasz, 2022, Studies on subfamily Aphodiinae (Coleoptera: Scarabaeoidea: Scarabaeidae) with description of three new species from the genera Agrilinus Mulsant & Rey, 1869 Gilletianus Balthasar, 1933 and Trichiorhyssemus Clouët, 1901, Zootaxa 5162 (3), pp. 223-242 : 231-234

Gilletianus miurai Minkina , new species

( Figs 19 , 21–23 , 36–38 )

Type locality. Malaysia, Borneo, Sabah, N Keningau, Bingkor .

Type material. Holotype (♂): “[ Malaysia] Borneo: Sabah, Bingkor / N Keningau, 400-500m., at / light, 20.11.1996, leg. / D. Grimm ”.

Description of the holotype, male. Dorsum ( Fig. 21 ). Body length of holotype 5.4 mm, elongate-oval, moderately convex, shiny, elytra weakly shiny, brownish with orange-brownish elytra and extermities, on each elytron before apex from third to sixth interval with brownish spot. Elytra glabrous except apical third and sides.

Head ( Fig. 19 ) widely trapezoidal, weakly convex, shiny, with trace of microreticulation. Clypeus rather thickly bordered, anteriorly weakly sinuate, laterally widely rounded, not notched before genae, clypeal border with very short and very sparse macrosetae. Genae obtuse, distinctly exceeding eyes, with few relatively long setae. Frontal suture not noticeable, without gibbosities; central epistomal gibbosity low. Clypeus distinctly, doubly punctate: smaller punctures variable in size, densely, somewhat regularly distributed, in basal part coarser, larger punctures with diameter two to four times larger than smaller ones, very sparse, irregularly distributed only in basal part.

Epipharynx ( Fig. 33 ) transverse, with sides broadly rounded, anterior margin of pedia convex, corypha clearly below of margin of pedia, reduced, with two distinct, large celtes. Mesoepitorma distinctly triangular, regularly widened posteriad. Acanthopariae with dense, short and thick chaetae; acropariae with dense, long and thiner chaetae than on acanthopariae; chaetopariae with dense belt of thin, long chaetae; adelochaetae absent; prophobae with very dense, short and thin setae; chaetopediae with relatively sparse, thick and long chaetae. Tormae relatively thin, short.

Pronotum transverse, somewhat wider than base of elytra, widest in the basal part, weakly convex, shiny, with trace of microreticulation, with double punctation: larger punctures irregularly spaced, eight to ten times larger than smaller ones, regular in size, three to six times larger than the smaller ones, relatively sparse, quite denser in basal part and on sides; smaller punctures quite regularly spaced, regular in size, rather dense; sides and base thinly bordered, anteriorly not bordered; sides and base with very short, quite dense setae; anterior angles widely rounded, hind angles obtuse, sides before hind angles very widely rounded, base of pronotum before hind angles very widely sinuate, additionally, somewhat more distinctly sinuate before the middle.

Scutellum small, triangular, with sides widely ogival, with very sparse, very fine punctures, weakly shiny, with microreticulation.

Elytra oblong, convex, widest near the middle, weakly shiny, with distinct microreticulation; without humeral denticles; with ten striae and ten intervals. Striae distinctly, densely and rather finely punctate; punctures rather weakly indenting margins of intervals. First and tenth striae joined together before apex; all the rest shortened before apex, sixth and seventh striae slightly shortened before base, eighth striae distinctly shortened before base, ninth and tenth striae joined before base. Intervals quite distinctly convex, punctate, punctures fine, quite dense, create two irregular rows nearby sides of each interval. Punctures on sides and in apical third with thin, moderately long macrosetae.

Legs. Femora shiny, without microreticulation, finely and quite densely punctate. Protibiae distinctly tridentate laterally, proximally with few small teeth; its dorsal side shiny, with few very fine punctures; apical spur long, moderately broad, very distinctly downwardly directed, with obtuse apex. Meso- and metatibiae with two strong transverse carinae, fimbriate apically with row of unequal spinules. Metatibiae superior apical spur distinctly shorter than basimetatarsomere, latter distinctly longer than next three following metatarsomeres combined. Claws rather short, thin, distinctly arcuate.

Macropterous.

Pygidium with similar structure to ventrites, except long macrosetae

Venter ( Fig. 22 ). Meso-metaventral plate shiny, concave, with distinct longitudinal line at middle; with fine, relatively sparse punctures. Abdominal ventrites rather mat, densely, not coarsely punctate; with distinct microreticulation; punctures in basal third forming row and bearing very long and thin macrosetae; remaining punctures bearing much thiner and shorter macrosetae.

Aedeagus ( Figs 36–38 ). Length about 3.3 mm, parameres about 0.5 x length of phallobase, regularly constricted till 1/3 from apex, then ventral margin obliquely truncate, in lateral view running as a straight line to apex. In dorsal view with a fringe of quite short, thin macrosetae on inner side of bend; apex acute.

Etymology. The new species is dedicated to the memory of famous Japanese manga cartoonist – Kentaro Miura.

Differential diagnosis. In a key to species of Ochi et al. (2016), G. miurai Minkina , new species can be identified as G. sundainsulanus Ochi, Kon & Kawahara, 2014 . However aedeagi of both species are distinctly different – in G. sundainsulanus the aedeagus is shorter, length about 2.5 mm and the parameres are relatively much shorter in relation to phallobase (about 0.39 x its length), their apices are less sharply upturned and the oblique truncature is less marked. Gilletianus miurai Minkina , new species and G. sundainsulanus are in my opinion almost identical in external view. The male of G. miurai Minkina , new species has the basal margin of pronotum near the middle rather more distinctly sinuate, somewhat different hind angles of pronotum and weakly sinuate clypeus anteriorly (when clypeus of G. sundainsulanus is rather trapezoidal) but in my opinion these are very subjective differences and will probably be lost in larger series of specimens.

Gilletianus miurai Minkina , new species and G. sundainsulanus are additionally closely related to G. reichei (Harold, 1859) (see Ochi et al. 2016). Gilletianus miurai Minkina , new species has additionally a quite similar aedeagus to G. reichei , but still more distinctly elongate. It is easily distinguished from G. reichei by the same features as G. sundainsulanus i.e.: relatively larger body, elytra proportionaly longer, distinctly different sides of pronotum.

Additionally the shape of aedeagus of G. miurai Minkina , new species is similar to G. mindorensis Ochi, Kon & Kawahara, 2010 known only from Mindoro Island. From this species it can be very easily distinguished (males) by macrosetation of elytra present only on sides and in apical third (in G. mindorensis macrosetation on almost the whole elytra).

Photographed material. See material for comparison.

Figures

FIGURES 13–20. Heads and pronotum. 13, Trichiorhyssemus immaturus Minkina, new species, holotype, female, head; 14, T. immaturus Minkina, new species, holotype, female, pronotum; 15, Agrilinus matusiaki Minkina, new species, holotype, male, head; 16, Agrilinus inexspectatus (Balthasar, 1935), male, head; 17, Agrilinus striatus (Schmidt, 1910), male, head; 18, Carinaulus meghalayensis (Červenka, 2000), male, head; 19, Gilletianus miurai Minkina, new species, holotype, male, head; 20, Gilletianus sundainsulanus Ochi, Kon & Kawahara, 2014, male, head.

FIGURES 21–23. Gilletianus miurai Minkina, new species. 21, habitus, holotype, male, dorsal view; 22, habitus, holotype, male, ventral view; 23, habitus, holotype, male, lateral view.

FIGURES 36–41. Aedeagi. 36–38, Gilletianus miurai Minkina, new species, holotype: 36, aedeagus, dorsal view; 37, aedeagus, lateral view; 38, apex of parameres, lateral view. 39–41, Gilletianus sundainsulanus Ochi, Kon & Kawahara, 2014: 39, aedeagus, lateral view; 40, aedeagus, dorsal view; 41, apex of parameres, lateral view.

FIGURES 30–35. Details of the morphology. 30–32, Agrilinus matusiaki Minkina, new species, holotype, male: 30, aedeagus, lateral view; 31, aedeagus, dorsal view; 32, epipharynx.33, Gilletianus miurai Minkina, new species, holotype,male, epipharynx; 34, Trichiorhyssemus immaturus Minkina, new species, holotype, female, epipharynx; 35, T. immaturus Minkina, new species, holotype, female, druseform macrosetae on border of pronotum.