Picolistrus flavoapicalis Y. Yang & Miao, 2025

Miao, Jialin, Liu, Haoyu, Tong, Junbo, Yang, Xingke & Yang, Yuxia, 2025, A remarkable new species of Picolistrus Majer, 1990 (Coleoptera, Dasytidae) from Yunnan, China, Biodiversity Data Journal 13, pp. e 156603-e 156603 : e156603-

publication ID	https://doi.org/10.3897/BDJ.13.e156603
DOI	https://doi.org/10.5281/zenodo.15550750
persistent identifier	https://treatment.plazi.org/id/E4C06286-62AC-5BAB-9BDD-48336AFB92FD
treatment provided by	Biodiversity Data Journal by Pensoft
scientific name	Picolistrus flavoapicalis Y. Yang & Miao
status	sp. nov.

Treatment

Picolistrus flavoapicalis Y. Yang & Miao sp. nov.

Materials

Type status: Holotype. Occurrence: recordedBy: Shuyong Wang; sex: 1 male; lifeStage: adult; occurrenceID: B4EAE4E6-FD29-5102-B4D4-792FE13B6E74; Location: country: China; stateProvince: Yunnan; county: Dêqên; locality: Meilishi village ; verbatimElevation: 2200 m; Event: year: 1982; month: 7; day: 19; Record Level: institutionID: Institute of Zoology, Chinese Academy of Sciences; institutionCode: IZAS

Type status: Paratype. Occurrence: recordedBy: Shuyong Wang; sex: 5 females; lifeStage: adult; occurrenceID: EF201593-6473-52D1-8101-CC060C451120; Location: country: China; stateProvince: Yunnan; county: Dêqên; locality: Meilishi village ; verbatimElevation: 2200 m; Event: year: 1982; month: 7; day: 19; Record Level: institutionID: Institute of Zoology, Chinese Academy of Sciences; institutionCode: IZAS

Description

Male (Fig. 1 View Figure 1 A). Body length 2.25 mm, width 0.78 mm.

Body black with slight lustre, elytral apices brownish-yellow. Antennomeres 1 blackish-brown, 2–11 brownish and gradually darkened towards apex. Legs brownish-yellow, with femora, tibiae and tarsomeres more or less darkened at apices. Body surface densely and shallowly punctate, densely covered with short and recumbent light yellow pubescence, pubescence on pronotum directing medially and posteriorly towards the mid-point of posterior margin.

Eyes moderately prominent, head width across eyes feebly wider than anterior margin of pronotum. Antennae extending to posterior 1 / 8 length of pronotum when inclined, with antennomeres 1 nearly conical, 2 ellipsoidal, 3–5 triangular and longer than wide, 6–10 globular, 11 fusiform, 1.5 times as long as wide.

Pronotum transverse and 1.2 times as wide as long, widest behind middle, anterior and posterior margins slightly arcuate, lateral margins arcuate with sparse crenation, anterior and posterior angles widely rounded. Elytra subparallel-sided, 1.9 times longer than humeral width, 2.3 times longer than pronotum, elytral edges fine, but distinct, rounded at apices. Protibia and mesotibia each with a concave, lamellate fixed spur at apical inner base.

Abdominal sternite VIII (Fig. 2 View Figure 2 A) strongly transverse and bilobed, rectangularly emarginate at posterior margin, acute at antero-lateral angles, present with a very short median process, surface covered with a few erect setae near posterior margin. Pygidium (Fig. 2 View Figure 2 B) slightly longitudinal, 1.2 times longer than wide, feebly narrowed posteriorly, slightly arcuate at anterior margin, not emarginate at posterior margin, with antero-lateral angles protruding and acute at apices, surface covered with a few long erect setae and short erect hairs along posterior margin.

Aedeagus: tegmen (Fig. 2 View Figure 2 C) with an elliptic subapical ring extending beyond middle from apical 1 / 8, both apex and base approximately triangular in ventral view; median lobe with apical limb more than 9.0 times longer than basal width in lateral view (Fig. 2 View Figure 2 F). Spiculum gastrale (Fig. 2 View Figure 2 G) with basal trunk shorter than apical branch.

Female (Fig. 1 View Figure 1 B). Similar to male, but body larger, 2.49–2.54 mm in length, 0.82–0.83 mm in width. Antennae slightly shorter, extending to posterior 1 / 4 length of pronotum when inclined, with antennomeres 6–10 slightly transverse. Pronotum 1.3 times as wide as long. Elytra distinctly dilated across apical third, 2.1 times longer than humeral width, 2.5 times longer than pronotum. Each tibia with two ordinary, sharp spurs at apical inner base. Abdominal sternite VIII (Fig. 3 View Figure 3 A) bilobed, with antero-lateral angles acute, median process very slender and distinctly extending beyond antero-lateral angles. Pygidium (Fig. 3 View Figure 3 B) shallowly emarginate in middle of anterior margin, not emarginate at posterior margin, with antero-lateral angles obviously protruding and round at apices.

Diagnosis

This species can be easily distinguished from all other species of Picolistrus by the bicoloured elytra, which are black and brownish-yellow at apices (Fig. 1 View Figure 1 ), tegmen sharp at apex in ventral view (Fig. 2 View Figure 2 C) and apical limb of median lobe slender, more than 9.0 times longer than basal width (Fig. 2 View Figure 2 F). In comparison, the elytra of all others are uniformly black or brown, except for P. palleatus Majer 1990 , whose elytra are testaceous with a large shadowy spot around black scutellum. Tegmen of all others are broadly rounded ( Majer (1990): fig. 71; Plonski (2016): fig. 3) or slightly emarginate at apex ( Majer (1990): fig. 52). Apical limb of median lobe is less elongate, at most 6.0 times longer than basal width in others ( Majer (1990): figs. 53, 69, 72 and 73; Plonski (2016): fig. 2).

Etymology

The species epithet is derived from the Latin flavus (yellow) and apicalis (of or belonging to an apex), referring to its elytra with brownish-yellow apices.

Distribution

China (Yunnan) (Fig. 4 View Figure 4 ).