Aglaostigma hejunhuai, Liu & Li & Wei, 2025

Liu, Meng-Meng, Li, Ze-Jian & Wei, Mei-Cai, 2025, Review of the Aglaostigma niuae group (Hymenoptera: Tenthredinidae) with descriptions of four new Chinese species, European Journal of Taxonomy 981, pp. 38-51 : 40-42

Aglaostigma hejunhuai sp. nov.

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Fig. 1

Diagnosis

Body mostly black; dorsal side of antenna blackish brown, ventral side reddish brown; most parts of supraclypeal area, around eyes, part of pronotum, half of tegula, median of mesoscutellum, hind tarsus except for most parts of metatarsomere 1 yellowish white; POL: OOL:OOCL = 1.0: 3.0: 1.7; postocellar area 2 × broader than long; antennomere 3 longer than antennomere 4 (1.8: 1.0), slightly shorter than antennomeres 4 and 5 combined (1.0: 1.2), length ratio of apical antennomeres 6–9 as 1.0: 1.1:1.0: 1.0; metatarsomere 1 as long as following 3 tarsomeres combined; tarsal claw with tooth as long as outer tooth; apical margin of subgenital plate inner-concave, penis valve without ergot.

Etymology

The specific epithet ‘ hejunhuai ’ honours Prof. Jun-Hua He’s tremendous contribution to the study of Hymenoptera .

Type material

Holotype

CHINA – Zhejiang Province • ♂; Mt Xitianmu, Xianrending ; 2–4 Jun. 1990; Yong-Gen Lou leg.; ASMN.

Paratypes

CHINA – Zhejiang Province • 2 ♂♂; Mt Xitianmu ; 6 Jun. 1989; ASMN .

Description

Male

MEASUREMENTS. Body length 7.0– 7.5 mm (N = 3) ( Fig. 1A–B ).

COLORATION ( Fig. 1A–B ). Body mostly black; following parts yellowish white: palps, basal half of mandibles, labrum, most parts of clypeus, most parts of supraclypeal area, around eyes, parts of pronotum, half of tegula, median of mesoscutellum, posterior margins of katepimeron, posterior corners of metepimeron, basal margins of abdominal terga 2–5, lateral of abdominal terga 1–6. Most parts of legs reddish brown; most parts of ventral side of all coxae, all trochanters, hind tarsus except for most parts of metatarsomere 1 yellowish white; dorsal side of all femora, small parts of hind tibia and metatarsomere 1 blackish brown. Body hairs silver; stigma largely blackish brown, vein C yellowish brown, other veins largely blackish brown.

PUNCTURES. Labrum nearly smooth, without distinct punctures; clypeus with some shallow and large punctures; dorsal side of head with clearly dense and minute punctures and microsculpture. Punctures on mesonotum minuter and weaker than head, interspace between punctures with fine microsculpture; mesepisternum with dense and minute punctures and fine microsculpture; mesepimeron with some coarse punctures; metepisternum with minute punctures and microsculpture; posterior part of metepimeron smooth, without distinct puncture or microsculpture. posterior part of mesoscutellum with dense punctures, others smooth. Abdominal tergum smooth, without distinct puncture or microsculpture; other abdominal terga with weak microsculpture, without distinct punctures.

HEAD. Anterior margin of labrum rounded; anterior margin of clypeus almost truncate, lateral margins slightly obtuse; malar space as broad as the diameter of median ocellus; inner margins of eyes slightly convergent downward ( Fig. 1D ); middle fovea clear and deep, lateral foveae open, convergent with frontal ridge furrows; interocellar furrow and postocellar furrow slightly weak; lateral postocellar furrow broad and deep, slightly parallel backward, POL:OOL: OOCL = 1.0: 3.0: 1.7; postocellar area elevated, mesosulcus weak, 2× broader than long; in dorsal view, lateral sides of vertex slightly divergent backward, temple 0.5 × broader than diameter of eyes, lateral sides almost parallel ( Fig. 1C ). Antennae filiform, clearly longer than head and thorax combined; antennomere 3 longer than antennomere 4 (1.8: 1.0), shorter than antennomeres 4 and 5 combined (1.0:1.2) slightly, length ratio of antennomeres 6–9 as 1.0: 1.1: 1.0:1.0 ( Fig. 1E ).

THORAX. Posterior corner of metepimeron square and obtuse ( Fig. 1G ), mesoscutellum low and flat, top rounded ( Fig. 1F ). Metatarsomere 1 as long as following 3 tarsomeres combined, slightly shorter than following 4 tarsomeres combined, inner apical spur of hind tibia slightly shorter than half of metatarsomere 1; tarsal claw with broad inner tooth, as long as outer tooth.

WINGS. Cell 2Rs in fore wing longer than cell 1Rs, outer and lower corner of cell 2Rs strongly extended; vein cu-a joining lower margin of cell 1M at basal 0.3, vein 2r joining upper margin of cell 2Rs at apical 0.3; hind wing with marginal vein, cell anal without petiole; cell M and cell Rs open.

ABDOMEN. Apical margin of subgenital plate inner-concave, gonoforceps as shown in Fig. 1H ; penis valve as shown in Fig. 1I .

Female

Unknown.

Distribution

China (Zhejiang Province).

Remarks

Within the Aglaostigma niuae group, only this species is identified as a new species solely based on male specimens. See the above key for detailed differences.

Figures

Fig. 1. Aglaostigma hejunhuai sp. nov., ♂, holotype (ASMN). A. Adult in dorsal view.B. Adult in lateral view. C. Head in dorsal view. D. Head in frontal view. E. Antennae in lateral view. F. Mesopleuron and metapleuron in dorsal view. G. Mesopleuron and metapleuron in lateral view. H. Gonoforceps. I. Penis valve. Scale bars: A = 2 mm; H = 100 µm; I = 200 µm.