Aglaostigma niuae, 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 : 45-47

Aglaostigma niuae sp. nov.

urn:lsid:zoobank.org:act:FE0E33B1-0813-4B2F-B061-19F43FE3EB89

Fig. 3

Diagnosis

Apical ⅓ of antennomere 5, antennomere 6 yellowish white; antennomeres 3–4, basal ⅔ of antennomere 5, antennomeres 7–9 black; most parts of pronotum, apical ½ of tegula yellowish white; POL: OOL:OOCL = 1.3: 1.0: 3.3; postocellar area 4× broader than long; length ratio of antennomeres 6–9 as 1.4:1.3: 1.3: 1.0; metatarsomere 1 slightly longer than following 3 tarsomeres combined; lancet with 11 serrulae, denticles large; ventral edge of annulus 1 without denticles and annular suture 1 curved, annulus 2 with three denticles and annular suture 2 slightly curved; middle serrulae without proximal denticle, with 6–7 distal denticles.

Etymology

The specific epithet ‘ niuae ’ refers to the first name of Dr Geng-Yun Niu, who collected two of the type specimens.

Type material

Holotype

CHINA – Tibet Autonomous Region • ♀; Bomi County, Moge ; 29°30.738′ N, 96°34.705′ E; 3772 m a.s.l.; 11 Jun. 2009; Mei-Cai Wei leg.; ASMN.

Paratypes

CHINA – Tibet Autonomous Region • 2 ♀♀; Bomi County, 24K; 29°48.287′ N, 95°41.914′ E; 3563 m a.s.l.; 21 Jun. 2009; Geng-Yun Niu leg.; ASMN .

Description

Female

MEASUREMENTS. Body length 8.0 – 8.5 mm (N = 3) ( Fig. 3A–B ).

COLORATION ( Fig. 3A–B ). Body mostly reddish brown; labrum, clypeus, apical ⅓ of antennomere 5, antennomere 6, most parts of pronotum, apical ½ of tegula, mesoscutellum and lateral sides of abdominal terga 2–7 yellowish white; antennomeres 3–4, basal 2/3 of antennomere 5, antennomeres 7–9, small parts of pronotum and mesopleuron, most parts of metapleuron and lateral areas of metascutellum black. Most parts of all coxae and all femora, apex of hind tibia blackish brown. Body hairs silver, vein C yellowish brown, other veins mostly blackish brown.

PUNCTURES. Labrum nearly smooth, without distinct punctures; clypeus with some shallow punctures; dorsal side of head, mesepisternum and metepisternum with conspicuously dense and minute punctures, weakly shiny; mesonotum with shallower and smaller punctures than head, microsculpture distinct; mesipimeron with some coarse and large punctures, microsculpture dense; metepimeron without distinct puncture, 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. 3D ); middle fovea well-defined, lateral foveae open, narrow and deep, joining frontal ridge furrows; interocellar and postocellar furrow slightly weak; lateral postocellar furrow broad and deep, slightly parallel backward, POL: OOL: OOCL = 1.3: 1.0: 3.3; postocellar area elevated, mesosulcus weak, 4 × 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. 3C ). Antennae filiform, clearly longer than head and thorax combined; antennomere 3 slightly longer than antennomere 4 (1.1: 1.0), clearly shorter than antennomeres 4 and 5 combined (1.0: 1.8), length ratio of antennomeres 6–9 as 1.4: 1.3: 1.3: 1.0 ( Fig. 3G ).

THORAX. Posterior corner of metepimeron rounded and obtuse ( Fig. 3F ), mesoscutellum rounded and elevated ( Fig.3E ); hind femur reachig to end of abdomen, metatarsomere 1 slightly longer than 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 as long as cell 1Rs, outer and lower corner of cell 2Rs extended strongly; vein cu-a joining lower margin of cell 1M at basal 0.3, vein 2r joining upper margin of cell 2Rs at middle 0.5; 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. 3H . Lancet with 11 serrulae ( Fig. 3I ), denticles large; ventral edge of annulus 1 without denticle and annular suture 1 curved, annulus 2 with three denticles and annular suture 2 slightly curved; middle serrulae without proximal denticle, with 6–7 distal denticles ( Fig. 3J ).

Male

Unknown.

Distribution

China (Tibet Autonomous Region).

Remarks

This species is similar to A. leucotarsalina , but differs from the latter as follows: apical ⅓ of antennomere 5 and antennomere 6 entirely yellowish white; most parts of hind metarbasitarsus reddish brown, tarsomeres 2–4 yellowish white; postocellar area 4 × broader than long; POL:OOL: OOCL = 1.3: 1.0: 3.3; length ratio of antennomeres 6–9 as 1.4:1.3: 1.3: 1.0; vein cu-a in fore wing joining lower margin of cell 1M at basal ⅓; lancet with 11 serrulae; middle serrulae without proximal denticle, with 6–7 distal denticles.

Figures

Fig. 3. Aglaostigma niuae 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.