Aspidophorodon (Eoessigia) longirostre Qiao & Xu, 2022

Xu, Ying, Jiang, Li-Yun, Chen, Jing, Kholmatov, Bakhtiyor Rustamovich & Qiao, Ge-Xia, 2022, Six new species of Aspidophorodon Verma, 1967 (Hemiptera, Aphididae, Aphidinae) from China, ZooKeys 1106, pp. 1-55 : 1

Aspidophorodon (Eoessigia) longirostre Qiao & Xu sp. nov.

Figs 16 , 17

Specimens examined.

Holotype: apterous viviparous female, China: Sichuan (Baoxing City), 18.VIII.2003, No. 15089-1-2-1, on Salix sp., coll. K. Guo. Paratypes: two apterous viviparous females (slides) and one apterous viviparous female (COI: OK668432 ), No. 15089-1-1, with the same collection data as holotype (NHMUK) .

Diagnosis.

Dorsum of body covered with oval sculptures; median frontal tubercle well-developed, imbricated, with a strong depression at the middle into two cylinders; antennal tubercles each with a short finger-shaped and imbricated process at inner apex, lower than median frontal tubercle; rostrum reaching hind coxae, URS long wedge-shaped, long and thin; URS 3.28-3.42 × as long as its width, 1.56-1.92 × as long as 2HT; tergite VIII produced caudad into triangular spinal process reaching the middle of the cauda and constricted at apex and with distinctly oval sculptures.

Description.

Apterous viviparous females: body elongated oval (Fig. 17A ).

Mounted specimens. Body pale in color (Fig. 17A ). See Table 3 for General measurements.

Head. Ocular tubercles small. Dorsum of head covered with oval sculptures, venter with wrinkles. Median frontal tubercle well-developed, imbricated, with a strong depression at middle separating it into two cylinders (Figs 16A , 17B ), each cylinder with one pair of long and blunt setae at apex. Antennal tubercles undeveloped, each with a short finger-shaped and imbricated process at inner apex, the apex is blunt, as high as median frontal tubercle, each with a long and blunt seta at apex (Figs 16A , 17B ). Dorsal setae of head short and capitate, with small setal tubercles. Head with one pair of dorsal setae between antennae, and two pairs of dorsal setae between compound eyes arranged transversely. Antennae 4-segmented, Ant. I distinctly projected into short cylindrical at inner apex (Figs 16B , 17C ), 0.014-0.023 mm, with two short and blunt setae at apex; Ant. I-II smooth, with slight wrinkles, Ant. III-IV with imbrications (Figs 16B , 17C ). Antennal setae short and blunt, Ant. I-IV with 3-4, 3-4, 3-4, 1-3 (base) +1 (PT) setae, respectively; apex of PT with two or three setae. Primary rhinaria unciliated. Rostrum reaching hind coxae, with apex pale brown; URS long wedge-shaped, long, and thin (Figs 16C , 17D ), with three pairs of primary setae and two or three accessory setae.

Thorax. Pronotum with oval and wavy sculptures; meso- and metanotum with oval sculptures on spinal area, pleura-marginal area with wavy and irregular polygonal sculptures. Thoracic setae sparse, short, blunt or capitate, with small setal tubercles; pronotum with two pairs of spinal setae, arranged anteriorly and posteriorly, one pair of pleural and one pair of marginal setae; meso- and metanotum each with one pair of spinal, one pair of pleural, and two pairs of marginal setae. Legs normal; coxae and femora smooth, distal parts of tibiae slightly imbricated. Setae on 2/3 distal part of femora and tibiae, short and blunt; hind tibiae with a row of short and blunt setae dorsally on middle. First tarsal chaetotaxy: 3, 3, 2. Second tarsal segments slightly imbricated.

Abdomen. Abdominal tergites I-VII with oval and irregular polygonal sculptures (Fig. 17F, G ); tergite VIII with distinctly oval sculptures, produced caudad into triangular spinal process reaching the middle of the cauda and constricted at apex (Figs 16D , 17G ). Abdominal ventral plate with fine spinules arranged in rows. Dorsal setae of abdomen short, capitate or blunt, with small bases, ventral setae short and pointed. Abdominal tergites I-II each with one pair of spinal, pleural, and marginal setae; tergites III-VII each with one pair of spino-pleural and one pair of marginal setae; tergite VIII with 9-12 setae at margin. Spiracles reniform, open; spiracular plates slightly swollen. SIPH long spoon-shaped, incurved inward, broad at base, thin at middle, slightly swollen distally, with distinct imbrications, obliquely truncated at tip, without flange (Figs 16E , 17H ). Cauda wide tongue-shaped, slightly constricted at the middle, with spinulose imbrications and four setae (Figs 16F , 17I ). Anal plate semicircular, spinulose (Figs 16G , 17J ), with 11-14 setae. Genital plate broadly round, with sparse spinules in transverse rows (Figs 16H , 17K ), with two anterior setae and 4-6 setae along the posterior margin.

Fourth instar apterous nymph. As in apterous viviparous females except as follows: legs normal; femora scabrous at distal part, and tibia with spinulose imbrications distributed on 2/3 distal part. Setae on legs short and blunt; hind tibiae with long pointed setae dorsally and short blunt setae ventrally, and with a row of short and blunt setae dorsally on the middle.

Etymology.

The new species is named for its long URS, Aspidophorodon longirostre being the neuter form of the adjective.

Taxonomic notes.

The new species resembles A. indicum (David, Rajasingh & Narayanan) in median frontal tubercle protuberant; dorsum of head covered with distinctly oval and wavy sculptures; abdominal tergite VIII with a spinal tubercle; but differs from it as follows: median frontal tubercle well-developed, imbricated, with a strong depression at the middle separating it into two cylinders, a finger-shaped and imbricated process at inner apex of antennal tubercles (the latter: median frontal tubercle protuberant rectangular and slightly depressed at the middle, a short cylindrical process at inner apex of antennal tubercles); abdominal tergite VIII produced caudad into triangular process (the latter: abdominal tergite VIII with conical spinal process); dorsum of head covered with oval sculptures (the latter: dorsum of head with densely semicircular and wavy sculptures).

The new species resembles A. furcatum Qiao & Xu, sp. nov. in well-developed median frontal tubercle, with a strong depression at middle separating it into two cylinders; abdominal tergite VIII produced caudad into triangular spinal process; SIPH long spoon-shaped, curved inward; cauda wide, tongue-shaped, slightly constricted at the middle. The new species differs from A. furcatum as follows: median frontal tubercle protuberant, 0.025-0.046mm; a finger-shaped and blunt process at inner apex of antennal tubercles, 0.027-0.047mm, as high as median frontal tubercle (the latter: median frontal tubercle well-developed, 0.063-0.077mm; a long finger-shaped and pointed process at inner apex of antennal tubercles, 0.077-0.095mm, higher than median frontal tubercle); rostrum reaching hind coxae, URS 3.28-3.42 × as long as its width, 1.56-1.92 × as long as 2HT (the latter: rostrum reaching mid-coxae, URS 2.21-3.18 × as long as its width, 1.31-1.62 × as long as 2HT); abdominal tergite VIII with oval sculptures, constricted at apex (the latter: abdominal tergite VIII with distinctly irregular polygonal makings and marginal area with wavy sculptures, blunt at apex).

Host plant.

Salix sp.

Distribution.

China (Sichuan).

Biology.

This species colonizes the undersides of leaves of its host plant.

Figures

Figure 16. Aspidophorodon (Eoessigia) longirostre Qiao & Xu, sp. nov. Apterous viviparous female A dorsal view of head B antenna C ultimate rostral segment D spinal process of abdominal tergite VIII E siphunculus F cauda G anal plate H genital plate. Scale bars: 0.10 mm.

Figure 17. Aspidophorodon (Eoessigia) longirostre Qiao & Xu, sp. nov. Apterous viviparous female A dorsal view of body B dorsal view of head C antenna D ultimate rostral segment E oval and irregular polygonal sculptures of abdominal tergites F dorsal view of abdominal tergites V-VIII G spinal process of abdominal tergite VIII H siphunculus I cauda J anal plate K genital plate. Scale bars: 0.10 mm.