Indomasonaphis polygoni Qiao & Xu sp. nov. Figs 4, 5, 6, 7, 13 A – D, Table 1 Type material. Holotype: China: Xizang: Yadong County, • one apterous viviparous female, 20.VII.2021, No. 51934-1-1, on Polygonum sp., coll. Y. Xu. Paratypes (11): China: Xizang: Yadong County, • one apterous viviparous female, 16.VIII.2020, No. 25915-1-1, on Polygonum sp., coll. Y. Wang; • one apterous viviparous female (COI GenBank accession: PV 567752), with the same collection information as No. 25915; • one apterous viviparous female, 17.VIII.2020, No. 25933-1-1, on Polygonum sp., coll. Q. H. Liu; • one apterous viviparous female (COI GenBank accession: PV 567753), with the same collection information as No. 25933; • one apterous viviparous female, 17.VII.2014, No. 32677-1-1, on Polygonum sp., coll. J. Chen and X. C. Zhu; • two apterous viviparous females, 20.VII.2021, No. 51931-1-1, 51931-2-1, on Polygonum sp., coll. Y. Xu; • one apterous viviparous female, 7.VII.2022, No. 52759-1-1, on Polygonum sp., coll. Z. X. Li; • one apterous viviparous female (COI GenBank accession: PV 567754), with the same collection information as No. 52759; • one nymph (COI GenBank accession: PV 567757), 7.VII.2022, No. 52807-1-1, on Polygonum sp., coll. Z. X. Li; • one apterous viviparous female, Linzhi County (Lulang Town), 3.VIII.2014, No. 32890-1-1, on Polygonum sp., coll. J. Chen and X. C. Zhu; one apterous viviparous female, Milin County, 30.VIII.2020, No. 49106-1-1, on Polygonum sp., coll. Y. Xu. Diagnosis. Body large (Fig. 4), length 5.15–6.37 mm. Ant. III with 22–41 secondary rhinaria in apterae, distributed on basal part (Figs 5 C, 7 B); SIPH clavate, cylindrical at basal 1 / 4, then expanded at distal 3 / 4, and slightly attenuated at apex, smooth, and with developed flange (Figs 6 E, 7 E), 0.12–0.16 × body length; cauda long and wide conical (Figs 6 C, 7 F), length 1.57–2.29 × basal width, with 15–29 setae; first tarsal chaetotaxy: 5, 5, 5. Description. Apterous viviparous females: body large, elongated oval (Fig. 4). Green in life, with red compound eyes, intersegmental regions of the dorsum and pleural areas yellowish-green, distal part of appendages pale brown (Fig. 13 D). For morphometric data see Table 1. Mounted specimens. Body dorsum pale, smooth, without sclerites; Ant. I and II pale, III – VI pale brown with intersegmental areas brown; apex of rostrum brown; distal part of tibiae and tarsi brown, remaining parts of leg pale brown; SIPH brown, but pale near base; cauda and anal plate pale brown (Fig. 4). Dorsal setae long, thick, and blunt at apexes; ventral setae long and pointed, as long as dorsal setae. Head. Frons concave, median frontal tubercle moderately swollen, low-rounded, antennal tubercles developed, distinctly protuberate and diverging, and each with one seta at apex (Figs 5 A, 7 A). Head with one pair of cephalic setae, two pairs of dorsal setae between antennae arranged longitudinally, two pairs of dorsal setae between compound eyes arranged transversely. Antennae 6 - segmented (Figs 5 C, D, 7 B), Ant. I – III smooth, IV – VI imbricated; antennal setae short and blunted, segments I – VI each with 4–6, 4, 11–14, 9–15, 4–7, 2–4 + 2 – 6 setae, respectively, processus terminalis with three apical setae. Primary rhinaria ciliated. Ant. III with 22–41 secondary rhinaria, distributed on the basal half (Figs 5 C, 7 B). Rostral apex reaching mid-coxae, URS wedge-shaped (Figs 5 B, 7 C), with three pairs of primary setae and 6–10 accessory setae. Thorax. Thoracic nota smooth. Pronotum with four spinal setae, one pair of pleural setae, and one pair of marginal setae; mesonotum and metanotum each bearing 4–14 spino-pleural setae and two pairs of marginal setae. Mesosternal furca with short stem (Figs 5 E, 7 D). Legs long. Femora with oval sculpturing on dorsal apices; distal parts of tibiae imbricated. Setae on legs long and pointed, moderately stout, densely distributed over entire segments (Fig. 6 A, B). First tarsal chaetotaxy: 5, 5, 5. Second tarsal segments with spinulose imbrications (Fig. 5 F). Abdomen. Abdominal tergites I – VI each with 5–16 spino-pleural setae, 2–7 pairs of marginal setae; abdominal tergites VIII with 5–12 setae (Fig. 6 F). Spiracles circular, closed; spiracular plates slightly swollen, pale brown. SIPH clavate, broad at base, basal 1 / 4 cylindrical, then expanded at distal 3 / 4, and slightly attenuated at apex, smooth without imbrications, and with developed flange (Figs 6 E, 7 E). Cauda long and wide conical, finely spinulose (Figs 6 C, 7 F), with 15–29 densely arranged long setae. Anal plate semi-circular, with spinulose striae and bearing 16–28 setae (Figs 6 G, 7 G). Genital plate broadly oval (Fig. 7 H), with densely spinulose striae, and 4–12 anterior setae and 11–23 setae along the posterior margin. Etymology. The species name is based on the generic epithet of its host plant Polygonum (Polygonaceae). Taxonomic discussion. The species resembles I. anaphalidis, but differs from it as follows: (1) the species feeds on Polygonum sp. (I. anaphalidis: the primary host plants are Rhododendron sp., and the secondary host plants mainly belong to the family Asteraceae); (2) Ant. III with 22–41 secondary rhinaria in apterae, distributed on basal part (I. anaphalidis: Ant. III without secondary rhinaria); (3) SIPH clavate, 0.12–0.16 × body length, cylindrical at basal 1 / 4, then expanded at distal 3 / 4, the SW SIPH 1.39–1.89 × MW SIPH, and then slightly attenuated at apex, smooth without imbrications, and with developed flange (I. anaphalidis: SIPH long clavate, 0.25–0.28 × body length, cylindrical at basal 1 / 3, then distinctly expanded at distal 2 / 3, the SW SIPH 2.79–2.81 × MW SIPH, and then gradually attenuated to apex, apical part of SIPH with 5–8 rows reticulations); and (4) cauda long and wide conical, length 1.57–2.29 × basal width, with 15–29 setae (I. anaphalidis: cauda elongated conical, length 2.89–3.13 × basal width, with 41–43 setae). The species can be distinguished from I. rumicis by follows: (1) Ant. III with 22–41 secondary rhinaria in apterae, distributed on basal part (I. rumicis: Ant. III without secondary rhinaria); (2) first tarsal chaetotaxy: 5, 5, 5 (I. rumicis: first tarsal chaetotaxy: 3, 3, 3); (3) dorsal setae long, thick, and blunt at apex (I. rumicis: dorsal setae long, thick, and capitate at apex); (4) SIPH clavate, 0.12–0.16 × body length, cylindrical at basal 1 / 4, then slightly expanded at distal 3 / 4, the SW SIPH 1.39–1.89 × MW SIPH, and then slightly attenuated at apex, smooth without imbrications (I. rumicis: SIPH clavate, 0.17–0.18 × body length, cylindrical at basal 1 / 2, then distinctly expanded at distal 1 / 2, the SW SIPH 2.32–2.91 × MW SIPH, and then gradually attenuated to apex, apical part of SIPH with 2–4 rows of imbrications). Biology. The species feeds on the underside of leaves of Polygonum sp. without causing noticeable damage (Fig. 13 A – D). Distribution. China (Xizang: Linzhi, Yadong).

Published as part of Nazarov, Shokhruz, Xu, Ying, Jiang, Li-Yun & Qiao, Ge-Xia, 2025, A new species and two new records of Indomasonaphis Verma, 1971 (Hemiptera, Aphididae) from China, pp. 343-362 in ZooKeys 1253 on pages 343-362, DOI: 10.3897/zookeys.1253.157130