Tetraserica konplong Ahrens, Pacholátko & Pham, 2025

Tetraserica konplong Ahrens, Pacholátko & Pham View in CoL , sp. nov.

Fig. 5A–F View FIGURE 5

Type material examined. Holotype ♂ “VS1051 / VS1051 Vietnam Kon Tum Pro., Kon Plong Dist., near Giraffe tree 15.v.2023 14°43’50”N, 108°21’41’’E P.V. Pham & G. Sabatinelli Tetraserica spnVi10 / Asia Sericini spec. 1364” ( IBHV) GoogleMaps . Paratype: 1 ♂ “VS1048 / VS1048 Vietnam Kon Tum Pro., Kon Plong Dist., near Giraffe tree 15.v.2023 14°43’50”N, 108°21’41’’E P.V. Pham & G. Sabatinelli Tetraserica spnVi10” ( ZFMK) GoogleMaps .

Description of the holotype. Length: 10.8 mm; length of elytra: 8.2 mm; maximum width: 6.1 mm. Dorsal surface dark reddish brown and glabrous, frons and pronotum with weak greenish shine, labroclypeus, ventral surface and legs reddish brown, antenna yellow.

Labroclypeus subtrapezoidal, wider than long, widest at base, lateral margins moderately convex and convergent to strongly rounded anterior angles, anterior margin weakly emarginate medially, margins moderately reflexed; surface weakly convex, moderately shiny, finely and densely punctate, glabrous; frontoclypeal suture indistinctly incised, flat and weakly curved medially; ocular canthus short and triangular, impunctate, with a single terminal seta. Smooth area anterior to eye twice as wide as long. Frons dull, with sparse, fine punctures, with two single erect setae beside each eye. Antenna yellowish, with ten antennomeres; club composed of four antennomeres in male, straight, as long as remaining antennomeres combined. Eyes small, ratio of diameter/interocular width: 0.52. Mentum elevated and slightly flattened anteriorly.

Pronotum moderately wide and convex, widest shortly before base, lateral margins evenly convex, strongly narrowed anteriorly towards sharp and slightly produced anterior angles, posterior angles convex. Anterior margin of pronotum slightly convex, with fine, complete marginal line. Surface finely and densely punctate, except minute setae glabrous, lateral and lateral anterior margins sparsely setose. Hypomeron not carinate. Scutellum triangular, finely and densely punctate.

Elytra oblong, widest in posterior third, striae distinctly impressed, finely and moderately densely punctate, intervals weakly convex, with fine and almost evenly dense punctures weakly concentrated along striae, with very minute setae in punctures and a very few short setae on odd intervals; epipleural edge robust, ending at convex external apical angle of elytra, epipleura densely setose; apical border with a narrow fringe of microtrichomes (100x).

Ventral surface dull, finely and densely punctate, metasternum sparsely covered with fine, short, or very minute setae; metacoxa glabrous, with a few single setae laterally; abdominal sternites finely and densely punctuate, with a transverse row of coarse punctures, each bearing a robust seta. Mesosternum between mesocoxae as wide as mesofemur. Ratio of length of metepisternum/metacoxa: 1/1.74. Pygidium moderately convex in apical half and dull, densely punctate, without smooth midline, almost glabrous, with a few longer setae along apical margin.

Legs wide; femora finely and sparsely punctate; metafemur wide and moderately shiny or dull, anterior margin acute, posterior margin smooth ventrally and only weakly widened in apical half, with a small, blunt tooth at basal third, posterior margin smooth dorsally, with a few short setae basally. Metatibia short and wide, widest at middle; ratio width/length: 1/2.8; basal group of dorsal spines of metatibia at first third, apical one at two thirds of metatibial length; distal margin not truncated, terminal spines of normal length. Tarsomeres dorsally smooth, with fine, dense setae ventrally on distal half, neither laterally nor dorsally carinate; metatarsomeres with a strongly serrated ridge ventrally and glabrous; first metatarsomere almost as long as following two tarsomeres combined, a third of its length longer than dorsal tibial spine. Protibia short, bidentate; anterior claws symmetrical, basal tooth of both claws bluntly truncate at apex.

Aedeagus: Fig. 5A–D View FIGURE 5 . Habitus: Fig. 5E, F View FIGURE 5 . Female unknown.

Variation. Length: 10.8–11.3 mm; length of elytra: 8.2–8.3 mm; maximum width: 6.1–6.9 mm.

Diagnosis. Tetraserica konplong Ahrens, Pacholátko & Pham , sp. nov. is in shape of aedeagus quite similar to T. yongbelar Ahrens, 2023 . The new species differs by the straight left parameres (dorsal view) the in basal half much narrower mesoventral apical process of phallobase (lateral view), and the distinctly longer right paramere, of which the portion distal of its bend is twice as long as the portion basal of it. Furthermore, T. konplong Ahrens, Pacholátko & Pham , sp. nov. has a posterior margin with a small, blunt tooth at basal third, which is lacking in T. yongbelar . From the also similar Tetraserica tanahrataensis Fabrizi, Dalstein & Ahrens, 2019 , the new species differs by the much longer right paramere, the more robust mesoapical apophysis of phallobase, and the almost straight, deeply split left paramere.

Etymology. The new species is named after its occurrence in the Kon Plong district (noun in apposition).