Aglaostigma tricoloricorne Liu, Li & Wei, 2025, sp. nov.
Creators: name: Liu, Meng-Meng
name: Li, Ze-Jian
name: Wei, Mei-Cai
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Tenthredinidae
Aglaostigma
Aglaostigma tricoloricorne

description: Aglaostigma tricoloricorne sp. nov.
urn:lsid:zoobank.org:act: 4A1603EF-67ED-4712-AAB5-47DFDEA67E62
Fig. 4
Diagnosis
Antennomeres 1–6 reddish brown to yellowish white, antennomeres 7–9 black; clypeus, tegula, hind tibia and metatarsomere 1 entirely reddish brown; POL: OOL:OOCL = 1.0:1.0: 1.8; postocellar area 2.2 × broader than long; length ratio of antennomeres 6–9 as 1.2: 1.1: 1.0:1.0; inner apical spur of hind tibia as long as half of metatarsomere 1; tarsal claw with broad and large inner tooth, slightly longer than outer tooth; cell anal in hind wing with short petiole, 0.3 × shorter than vein cu-a; cell 1M closed; valvula 3 longer than valvifer 2; lancet with 14 serrulae, with small denticles; annular suture 1 nearly straight, ventral edge of annulus 1 with weak denticles; annular suture 2 curved, ventral edge of annulus 2 with six denticles; middle serrulae with 1 proximal and 11–13 distal denticles.
Etymology
The species epithet ‘ tricoloricorne ’ refers to the three-colored antenna.
Type material
Holotype
CHINA – Shaanxi Province • ♀; Foping County, Daguping; 33°34.612′ N, 107°46.553′ E; 1320 m a.s.l.; 28 Apr. 2006; Mo-Jun He leg.; ASMN.
Paratypes
CHINA – Hubei Province • 1 ♀; Yichang City, Mt Shennongjia, Yinyuhe; 31°34.005′ N, 110°20.370′ E; 2100 m a.s.l.; 17 May 2012, Ze-Jian Li leg.; ASMN. – Shaanxi Province • 1 ♀; Foping County, Yueba; 33°32.962′ N, 107°49.212′ E; 1085 m a.s.l.; 29 Apr. 2006; Xun Zhu leg.; ASMN. – Unknown province • 1 ♀; Temple Dele (unknown province); 24 Feb. 1957; ASMN.
Description
Female
MEASUREMENTS. Body length 8.0 – 8.5 mm (N = 4) (Fig. 4A–B).
COLORATION (Fig. 4A–B). Body mostly reddish brown; labrum, stripes on inner orbit, antennomeres 5–6, posterior margin of pronotum, middle parts of mesepisternum, posterior of median mesoscutal lobes, mesoscutellum, metascutellum, lateral sides of abdominal terga 1–4, small maculae of lateral sides of terga 5–6, posterior margins of terga 1–2, center of posterior margin of tergum 3, most parts of tergum 4 yellowish white; antennomeres 1–4 reddish brown to yellowish brown; antennomeres 7–9, front area of torulus, lateral foveae, ocellus area, anterior sides of pronotum, notaulus, margins and lateral areas of mesoscutellum, most parts of mesoscutellar appendage, margins of mesepisternum, most parts of mesepimeron, small parts of metepisternum, metepimeron black. Most parts of all coxae and hind femur blackish brown; all trochanters, hind tarsomeres 2–4 yellowish white. Body hairs silver; stigma blackish brown, vein C yellowish brown, other veins mostly blackish brown.
PUNCTURES. Clypeus, ocellus area, most parts of temple, lateral corners of pronotum, most parts of mesepimeron, metepimeron with slightly dense and minute punctures, microsculpture fine; mesonotum and mesepisternum with fine microsculpture, without punctures; abdominal tergum 1 with distinct microsculpture, other terga with fine microsculpture, without punctures.
HEAD. Anterior margin of labrum rounded; apical margin of clypeus almost truncate, lateral margins convergent forward slightly; malar space 2× broader than the diameter of median ocellus; inner margins of eyes convergent downward slightly (Fig. 4D); middle fovea distinct, lateral foveae open, broad and deep, joining frontal ridge furrows; interocellar furrow weak, postocellar furrow slightly broad and shallow; lateral postocellar furrow broad and deep, furrows posteriorly nearly parallel; POL: OOL:OOCL = 1.0: 1.0: 1.8; postocellar area elevated, mesosulcus weak, 2.2× 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. 4C). Antennae filiform, clearly longer than head and thorax combined, as long as abdomen; antennomere 3 slightly longer than antennomere 4 (1.1: 1.0), shorter than antennomeres 4 and 5 combined (1.0: 1.7), length ratio of antennomeres 6–9 as 1.2: 1.1: 1.0: 1.0 (Fig. 4G).
THORAX. Posterior corner of metepimeron rounded and obtuse (Fig. 4F), mesoscutellum flat (Fig. 4E); hind femur reaching end of abdomen, metatarsomere 1 as long as following 3 tarsomeres combined, shorter than following 4 tarsomeres combined, inner apical spur of hind tibia as long as half of metatarsomere 1; tarsal claw with broad and large inner tooth, slightly longer than outer tooth.
WINGS. Cell 2Rs in fore wing longer than 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 apical 0.4; anal cell in hind wing with short petiole, 0.3 × shorter than vein cu-a; cell 1M closed, short square; cell Rs open.
ABDOMEN. Valvula 3 longer than valvifer 2, ovipositor sheath in lateral view as shown in Fig. 4H. Lancet with 14 serrulae (Fig. 4I), with small denticles; annular suture 1 nearly straight, ventral edge of annulus 1 with weak denticles; annular suture 2 curved, ventral edge of annulus 2 with six denticles; middle serrulae with 1 proximal and 11–13 distal denticles (Fig. 4J).
Male
Unknown.
Distribution
China (Hubei, Shaanxi provinces).
Remarks
This new species can be easily distinguished from other species of the A. niuae group by its three-colored antenna; clypeus, tegula, hind tibia and metatarsomere 1 entirely reddish brown; tarsal claw with inner tooth slightly longer than outer tooth; anal cell in hind wing with a short petiole, cell 1M closed; valvula 3 longer than valvifer 2; lancet with 14 serrulae, with small denticles.
description: Published as part of 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, pp. 38-51 in European Journal of Taxonomy 981 on pages 48-50, DOI: 10.5852/ejt.2025.981.2809, http://zenodo.org/record/15005504