Indomasonaphis polygoni Qiao & Xu, 2025

Indomasonaphis polygoni Qiao & Xu sp. nov.

Figs 4 View Figure 4 , 5 View Figure 5 , 6 View Figure 6 , 7 View Figure 7 , 13 A – D View Figure 13 , Table 1 View 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 View Figure 4 ), length 5.15–6.37 mm. Ant. III with 22–41 secondary rhinaria in apterae, distributed on basal part (Figs 5 C View Figure 5 , 7 B View Figure 7 ); 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 View Figure 6 , 7 E View Figure 7 ), 0.12–0.16 × body length; cauda long and wide conical (Figs 6 C View Figure 6 , 7 F View Figure 7 ), 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 View Figure 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 View Figure 13 ). For morphometric data see Table 1 View 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 View Figure 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 View Figure 5 , 7 A View Figure 7 ). 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 View Figure 5 , 7 B View Figure 7 ), 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 View Figure 5 , 7 B View Figure 7 ). Rostral apex reaching mid-coxae, URS wedge-shaped (Figs 5 B View Figure 5 , 7 C View Figure 7 ), 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 View Figure 5 , 7 D View Figure 7 ). 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 View Figure 6 ). First tarsal chaetotaxy: 5, 5, 5. Second tarsal segments with spinulose imbrications (Fig. 5 F View Figure 5 ).

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 View Figure 6 ). 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 View Figure 6 , 7 E View Figure 7 ). Cauda long and wide conical, finely spinulose (Figs 6 C View Figure 6 , 7 F View Figure 7 ), with 15–29 densely arranged long setae. Anal plate semi-circular, with spinulose striae and bearing 16–28 setae (Figs 6 G View Figure 6 , 7 G View Figure 7 ). Genital plate broadly oval (Fig. 7 H View Figure 7 ), 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 View Figure 13 ).

Distribution.

China ( Xizang: Linzhi, Yadong).