Sinolachnus yunnanensis Qiao & Li, 2023

Li, Zhao-Xu, Chen, Jing, Jiang, Li-Yun & Qiao, Ge-Xia, 2023, Two new species of Sinolachnus Hille Ris Lambers (Hemiptera, Aphididae, Lachninae) from China, ZooKeys 1182, pp. 135-151 : 135

Sinolachnus yunnanensis Qiao & Li sp. nov.

Figs 36-45 , 46-58 , 59-64

Type material.

Holotype: apterous viviparous female, CHINA: Yunnan Province (Nujiang Lisu Autonomous Prefecture, 26.4401°N, 99.3911°E, alt. 2341 m), 28 July 2022, No. 54113-1-1, on Elaeagnus sp., coll. S. Xu and Ying Wang; Paratypes: one alate viviparous female, others same as holotype; two apterous viviparous females and one alate viviparous female, CHINA: Yunnan Province (Nujiang Lisu Autonomous Prefecture, 26.5618°N, 99.4392°E, alt. 2774 m), 1 August 2022, No. 54211, on Elaeagnus sp., coll. S. Xu and Ying Wang; two apterous viviparous females, CHINA: Yunnan Province (Diqing Tibetan Autonomous Prefecture, 27.3449°N, 99.2376° E, alt. 2529 m), 2 August 2022, No. 54223-1-1, on Elaeagnus sp., coll. S. Xu and Ying Wang; two apterous viviparous females, CHINA: Yunnan Province (Diqing Tibetan Autonomous Prefecture, 27.3407°N, 99.2448°E, alt. 2558 m), 2 August 2022, No. 54230-1-1, on Elaeagnus sp., coll. S. Xu and Ying Wang; two apterous viviparous females, CHINA: Yunnan Province (Diqing Tibetan Autonomous Prefecture, 27.2209°N, 99.2755°E, alt. 2152 m), 3 August 2022, No. 54252-1-1, on Elaeagnus sp., coll. S. Xu and Ying Wang; one apterous viviparous female and one apterous nymph, CHINA: Yunnan Province (Diqing Tibetan Autonomous Prefecture, 27.1958°N, 99.3338°E, alt. 2395 m), 4 August 2022, No. 54260-1-1, on Elaeagnus sp., coll. S. Xu and Ying Wang; two apterous viviparous females, CHINA: Yunnan Province (Diqing Tibetan Autonomous Prefecture, 27.1965°N, 99.3306°E, alt. 2347 m), 4 August 2022, No. 54271-1-1, on Elaeagnus sp., coll. S. Xu and Ying Wang; two apterous viviparous females, CHINA: Yunnan Province (Diqing Tibetan Autonomous Prefecture, 27.1976°N, 99.3210°E, alt. 2289 m), 4 August 2022, No. 54272-1-1, on Elaeagnus sp., coll. S. Xu and Ying Wang; two apterous viviparous females, CHINA: Yunnan Province (Diqing Tibetan Autonomous Prefecture, 27.2708°N, 99.2311°E, alt. 2215 m), 4 August 2022, No. 54279-1-1, on Elaeagnus sp., coll. S. Xu and Ying Wang; CHINA: Yunnan Province (Lijiang City, 26.7731°N, 100.0227°E, alt. 2880 m), 12 August 2022, No. 54424-1-1, on Elaeagnus sp., coll. S. Xu and Ying Wang.

Etymology.

The new species is named after its distribution location, yunnanensis being the masculine form.

Diagnosis.

Body relatively small, less than 3 mm in length. PT with 2-6 long setae on basal part. Abdominal tergites of apterous viviparous females often with small scattered spinal sclerites and sometimes fused or unobvious. Alate viviparous females with fewer secondary rhinaria, Ant. III-VI with 70-80, 14, 8, 3 secondary rhinaria, respectively; fore wings with media once branched; abdominal tergite VII with a broad transverse patch with irregular margin.

Description.

Apterous viviparous female: Body oval, with densely long setae, reddish-brown in life (Figs 61-63 ), apical or whole antennae and legs, siphunculi, and a transverse patch on abdominal tergite VII dark brown.

Mounted specimens. Head, antennae, rostral segments III-V, pronotum, mesonotum, legs, siphunculi, cauda, anal plate and genital plate dark brown; other parts pale brown; setae on metanotum and abdominal tergites, and some on venter of abdomen bearing dark base-sclerites. For morphometric data, see Table 2 .

Head. Head dorsum smooth, with an obvious dark median suture. Head with 104-137 long and pointed dorsal setae. Frons round. Ocular tubercles well developed (Figs 36 , 47 ). Antennae almost smooth (Figs 37 , 48 ), basal part of Ant. III and PT with transverse striae. Antennal setae fine, long and pointed, Ant. I-VI each with 22-30, 28-35, 106-131, 27-38, 29-40, 28-36+3-8 setae, respectively; PT with 5 short blunt setae at apex. Primary rhinaria round, Ant. VI with 4 or 5 accessory rhinaria around primary rhinaria; secondary rhinaria often absent, Ant. III and IV with 1 or 2, Ant. VI with 1 round and protuberant secondary rhinarium occasionally. Rostrum long, reach abdominal segment V; URS elongate wedge-shaped (Figs 38 , 49 ), with 3 pairs of primary setae and 18-26 accessory setae.

Thorax. Metanotum with small scattered sclerites on spino-pleural part, and 1 pair of marginal sclerites. Dorsal setae long and pointed. Mesosternal furca with a short stem (Figs 39 , 50 ). Legs normal, with long and pointed setae. First tarsal chaetotaxy: 9-12, 8-10, 5-8; first fore tarsal segments with 3-7 peg-like setae and 3-7 long setae, first mid-tarsal segments with 2-4 peg-like setae and 5-8 long setae, first hind tarsal segments with 0-2 peg-like setae and 4-6 long setae.

Abdomen. Abdominal tergites I-VI with reticulations, tergites VII, VIII and venter with spinulose stripes. Abdominal tergite I and marginal part of tergite II with small scattered sclerites; tergites II-V with scattered spinal sclerites, sometimes fused (Figs 41 , 52 ) or unobvious; tergite VI often with scattered spino-pleural sclerites, sometimes fused; tergite VII with a broad transverse patch with irregular margin; tergite VIII with a narrow band, sometimes separated in the middle; intersegmental muscle sclerites small and dark. Dorsal setae fine, long and pointed. Abdominal tergite VIII with 36-65 setae. Spiracles oval, closed, on brown spiracular plates. Siphunculi truncate, on dark brown seta-bearing cones, with flange and transverse striae (Figs 42 , 53 ), surrounding by 135-195 setae. Cauda round with spinulose stripes, with 33-45 long or short setae (Figs 43 , 54 ). Anal plate broadly round with spinules, with 77-95 long or short setae (Fig. 55 ). Genital plate transverse elliptical, anterior part slightly concaved, with spinulose stripes, with 120-148 setae (Fig. 56 ). Genopophyses three, each with 6-7, 6-10, 6-7 setae.

Alate viviparous female: Body elongate oval, head and thorax blackish brown, abdomen brown in life (Fig. 64 ); antennae, legs, siphunculi and patches on abdominal tergites VII and VIII blackish-brown.

Mounted specimens. Head, antennae, rostral segments III-V, thorax, legs except basal part of femora, siphunculi, cauda, anal plate and genital plate dark brown, other parts pale brown; dorsal and ventral setae on abdomen bearing dark base-sclerites. For morphometric data, see Table 2 .

Head. Head dorsum smooth, with an obvious dark median suture. Head with 71-79 long and pointed dorsal setae. Frons flat. Ocular tubercles well developed. Antennae almost smooth (Figs 44 , 58 ), basal part of Ant. III and PT with transverse striae. Antennal setae fine, most long and pointed, few short and blunt, Ant. I-VI each with 19-23, 30, 101, 33, 32, 32+7 setae, respectively; PT with 5 short blunt setae at apex. Primary rhinaria round, Ant. VI with 4 accessory rhinaria around primary rhinaria; secondary rhinaria round and protuberant, Ant. III-VI with 70-80, 14, 8, 3 secondary rhinaria, respectively. Rostrum long, reach abdominal segment IV; URS elongate wedge-shaped, with 3 pairs of primary setae and 18 accessory setae.

Thorax. Legs normal, with long and pointed setae. First tarsal chaetotaxy: 7-10, 6-10, 4; first fore tarsal segments with 4 or 5 peg-like setae and 3-5 long setae, first mid-tarsal segments with 2-5 peg-like setae and 4 or 5 long setae, first hind tarsal segments with none or 1 peg-like setae and 3 or 4 long setae. Wings with scaly imbrications entirely (Fig. 57 ); campaniform sensilla near the base of subcosta slightly protuberant, fore wings and hind wings each with 10-14 and 7-9 campaniform sensilla on basal part, respectively; fore wings with pterostigma elongate, pale media once branched and faint on basal part (Fig. 45 ); hind wings with two oblique veins.

Abdomen. Abdominal tergites smooth, reticulations obvious or not; tergites VII, VIII and venter with spinulose stripes. Abdominal tergites I-III each with 1 pair of marginal sclerites, tergites V and VI with a few scattered spinal sclerites, tergite VII with a broad transverse patch with irregular margin; tergite VIII with a narrow band; intersegmental muscle sclerites small and dark. Setae on abdominal tergites fine, most long and pointed, few short and blunt, dorsal setae sparser than on venter. Abdominal tergite VIII with 28 setae. Spiracles oval and closed, on brown spiracular plates. Siphunculi truncate, on dark brown seta-bearing cones, apical with few transverse striae and flange, surrounding by 140-156 setae. Cauda round with spinulose stripes, with 32-43 long or short setae. Anal plate broadly round with spinules, with 71-78 long or short setae. Genital plate transverse elliptical with spinulose stripes, with 110-124 setae. Genopophyses three, each with 7, 8, 7 setae.

Distribution.

China (Yunnan).

Host plant.

Elaeagnus sp. ( Elaeagnaceae ).

Biology.

The species colonizes branches and stems of host plants near the ground under ant nests.

Comments.

Apterae of the new species resemble Sinolachnus rubi , which is only known from apterous viviparous females, in having abdominal tergites with scattered spinal sclerites, sometimes fused, but differs from it as follows: body relatively small, 1.94-2.64 mm in length (the latter: 2.70-3.40 mm); Ant. VI 0.50-0.66 times as long as Ant. III (the latter: 0.40-0.42 times); secondary rhinaria often absent, Ant. III and IV with 1 or 2, Ant. VI with 1 occasionally (the latter: Ant. III-VI with 1-7, 1-6, 1-5, 1-3 secondary rhinaria, respectively); Setae on Ant. III 3.19-4.86 times as long as Ant. III BD (the latter: 2.12-2.75 times); URS with 18-26 secondary setae (the latter: URS with 11 or 12 secondary setae); Setae on Hind tibiae 1.48-2.14 times as long as MW hind tibia (the latter: 0.90-1.20 times); HT Ib 2.40-3.60 times as long as HT Id (the latter: 1.80-2.00 times); abdominal tergite VIII with 36-65 setae (the latter: 18-20 setae), Setae on Tergite VIII 3.61-5.33 times as long as Ant. III BD (the latter: 2.70-3.40 times).

Alatae of the new species resemble S. nipponicus , which is only known from alate viviparous females, in having the body relatively small (body length less than 3.00 mm), Ant. III with fewer secondary rhinaria (66-88 secondary rhinaria), PT with several long setae on basal part, media of fore wings once branched, but differs from it as follows: PT 0.57 times as long as Ant. VIb (the latter: 0.73-0.83 times); Ant. VIb with 32 setae (the latter: 21-23 setae); Setae on Hind tibiae 0.10-0.12 mm (the latter: 0.070-0.075 mm); abdominal tergites V and VI with few scattered spinal sclerites, tergite VII with a broad transverse patch with irregular margin (the latter: abdominal tergites I-VII without spinal and pleural patches); genital plate transverse elliptical (the latter: genital plate with irregular and divided proximal part).

Figures

Figures 36 - 45. Sinolachnus yunnanensis Qiao & Li, sp. nov. Apterous viviparous female: 36 dorsal view of head 37 antenna 38 URS 39 mesosternal furca 40 hind first tarsal segment 41 reticulations and setae bearing dark base-sclerites on spinal part of abdominal tergites 42 siphunculus 43 cauda. Alate viviparous female: 44 antenna 45 fore wing. Scale bars: 0.10 mm (36 - 44); 0.50 mm (45). (Figs 36, 37 and 40 were drawn according to type material No. 54272, Figs 38 and 39 according to No. 54223, Fig. 41 according to No. 54224, Figs 42 - 44 according to No. 54211, Fig. 45 according to No. 54113)

Figures 46 - 58. Sinolachnus yunnanensis Qiao & Li, sp. nov. Apterous viviparous female: 46 dorsal view of body with large sclerites 47 dorsal view of head 48 antenna 49 URS 50 mesosternal furca 51 hind tarsi and claws 52 reticulations and setae bearing dark base-sclerites on spinal part of abdominal tergites 53 siphunculus 54 cauda 55 anal plate 56 genital plate. Alate viviparous female: 57 dorsal view of body 58 antenna. Scale bars: 1.00 mm (46, 57); 0.10 mm (47 - 56, 58). (Fig. 46 was photographed according to type material No. 54424, Figs 47, 48, 51 and 52 according to No. 54272, Figs 49 and 50 according to No. 54223, Figs 53, 54, 56 and 58 according to No. 54211, Fig. 55 according to No. 54252, Fig. 57 according to No. 54113)

Figures 59 - 64. Sinolachnus yunnanensis Qiao & Li, sp. nov. 59, 60 host plant 61 - 63 apterous viviparous females and nymphs on stems of host plants near the ground 64 alate viviparous female.