Aglaostigma leucotarsalina, 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 : 43-45

Aglaostigma leucotarsalina sp. nov.

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Fig. 2

Diagnosis

Antennomeres 6–8 yellowish white; pronotum and tegula entirely reddish brown; apical ⅓ of hind tibia blackish brown; hind tarsus white; POL: OOL: OOCL = 1.0: 1.4: 2.6; postocellar area 3 × broader than long; length ratio of apical antennomeres 6–9 as 1.7: 1.6: 1.3:1.0; mesoscutellum rounded and elevated; vein cu-a in the fore wing joining cell 1M at basal 0.4, vein 2r joining cell 2Rs at apical 0.4; lancet with 12 serrulae, denticles large and few, annular sutures 1–2 slightly curved, ventral edge of annulus 1 without denticles, annulus 2 with five denticles; middle serrulae with 1 proximal and 3–5 distal denticles.

Etymology

The specific epithet ‘ leucotarsalina ’ refers to the white hind tarsus.

Type material

Holotype

CHINA – Sichuan Province • ♀; Luding County, Mt Hailuogou ; 29°603′ N, 102°076′ E; 2200 m a.s.l.; 3 Jul. 2002; Ze-Jian Li leg.; ASMN.

Description

Female

MEASUREMENTS. Body length 8 mm (N = 1) ( Fig. 2A–B ).

COLORATION ( Fig. 2A–B ). Body largely reddish brown; labrum, clypeus, apical margin of antennomere 5, antennomeres 6–8, a small macula at median of metascutellum, most parts of abdominal tergum 2, basal margin and lateral parts of tergum 3, lateral parts of terga 4–5 and most parts of abdominal sterna 2–5 yellowish white to white; mesoscutellum yellow; antennomeres 3–4, most parts of antennomere 5, antennomere 9 black; thoracic sterna, metepimeron, lateral areas of metascutellum, most parts of abdomen, most parts of all coxae and femora, apical ⅓ of hind tibia blackish brown. apical margins of middle and hind coxae, most parts of fore trochantellus, middle and hind trochanters, basal margins of middle and hind trochanters, fore and middle tarsomeres 2–4 and hind tarsus white. Body hairs silver; stigma mostly blackish brown, vein C yellowish brown, other veins mostly blackish brown.

PUNCTURES. Labrum nearly smooth, without distinct punctures; clypeus with some shallow and large punctures; dorsal side of head, mesepisternum and metepisternum with markedly dense and minute punctures, weakly shiny;mesonotum with shallower and more minute punctures than head,microsculpture clear; mesipimeron with some coarse and large punctures, microsculpture dense; metepimeron mostly without distinct punctures, with weak microsculpture, strongly shiny. Mesoscutellum and abdominal tergum 1 smooth, without punctures or microsculpture, strongly shiny, other terga with fine microsculpture, without punctures.

HEAD. Anterior margin of labrum rounded; apical margin of clypeus almost truncate, lateral margins slightly convergent forward; malar space 2 × broader than diameter of median ocellus; inner margins of eyes slightly convergent downward ( Fig. 2D ); middle fovea slightly broad and shallow, lateral foveae deep and open, joining frontal ridge furrows; interocellar and postocellar furrow slightly thin and shallow; lateral postocellar furrow broad and deep, furrows nearly parallel posteriorly, POL: OOL: OOCL = 1.0: 1.4: 2.6; postocellar area elevated, mesosulcus weak, 3 × broader than long; in dorsal view, vertex 0.5 × broader than diameter of eyes, temple 0.5 × broader than diameter of eyes, sides almost parallel ( Fig. 2C ). Antennae filiform, clearly longer than head and thorax combined; antennomere 3 slightly shorter than antennomere 4 (1.0: 1.1), or half as long as antennomeres 4 and 5 combined; length ratio of antennomeres 6–9 as 1.7: 1.6: 1.3: 1.0 ( Fig. 2G ).

THORAX. Posterior corner of metepimeron square and obtuse ( Fig. 2F ), mesoscutellum rounded and elevated ( Fig. 2E ); hind femur extended to the end of abdomen, 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 inner tooth shorter than outer tooth. WINGS. Cell 2Rs in fore wing about as long as cell 1Rs, outer and lower corner of cell 2Rs strongly extended; vein cu-a joining lower margin of cell 1M at basal 0.4, vein 2r joining upper margin of cell 2Rs at apical 0.4; cell anal in hind wing without petiole, cell M and cell Rs open.

ABDOMEN. Valvula 3 as long as valvifer 2, ovipositor sheath in lateral view as in Fig. 2H . Lancet with 12 serrulae ( Fig. 2I ), denticles large and few, annular sutures 1–2 slightly curved, ventral edge of annulus 1 without denticles, annulus 2 with five denticles; middle serrulae with 1 proximal and 3–5 distal denticles ( Fig. 2J ).

Male

Unknown.

Distribution

China (Sichuan Province).

Remarks

This new species can be easily distinguished from other species of the A. niuae group by its entirely yellowish white antennomeres 6–8 and entirely black antennomere 9; lancet with 12 serrulae, denticles large and few.

Figures

Fig. 2. Aglaostigma leucotarsalina 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. Mesopleuron and metapleuron in dorsal view. F. Mesopleuron and metapleuron in lateral view. G. Antennae in lateral view. H. Ovipositor sheath in lateral view. I. Lancet. J. 4th–6th serrulae. Scale bars: A = 2 mm; I = 200 µm; J = 100 µm.