Sinolachnus rubusis 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 rubusis Qiao & Li sp. nov.

Figs 1-15 , 16-27 , 28-33 , 34-35

Type material.

Holotype: apterous viviparous female, CHINA: Shaanxi Province (Baoji City, Tongtianhe National Forest Park, 34.2133°N, 106.5861°E, altitude 1650 m), 12 July 2016, No. 37534-1-1, on Rubus sp., coll. R. Chen and C.C. Du. Paratypes: seven apterous viviparous females and one alate viviparous female, with the same collection data as holotype; one apterous viviparous female and three alate viviparous females, CHINA: Sichuan Province ( Ya’an City, Zhougong Mountain), 14 July 2018, No. 43462, on Rubus sp., coll. Yong Wang.

Etymology.

The new species is named after the genus name of its host plant, rubusis being the masculine form.

Diagnosis.

In apterae, abdominal tergites IV-VII with scattered sclerites, pleural and marginal sclerites often incompletely fused (Fig. 16 ). In alatae, antennae with fewer round and protuberant secondary rhinaria in various sizes, Ant. III-VI with 29-54, 5-18, 3-14, 4-8 secondary rhinaria, respectively; abdominal tergite VII without sclerites.

Description.

Apterous viviparous female: Body oval, reddish-brown in life, dorsal patches and siphunculi dark brown (Fig. 34 ).

Mounted specimens. Head, antennal segments except basal half of Ant. III, rostral segments III-V, pronotum, mesonotum, distal half of tibiae, tarsi, siphunculi, cauda, anal plate and genital plate dark brown; other parts pale brown; coxae, trochanters, femora and basal half of tibiae pale yellowish-brown; setae on metanotum and abdominal tergites bearing dark base-sclerites. For morphometric data, see Table 1 .

Head. Head dorsum smooth, with an obvious dark median suture. Head with 88-111 long and pointed dorsal setae. Frons round. Ocular tubercles well developed (Figs 1 , 18 ). Antennae almost smooth (Figs 2 , 19 ), distal part of Ant. II with polygonal reticulations on dorsal (Fig. 3 ), basal part of Ant. III and PT with transverse striae. Antennal setae fine, long and pointed, Ant. I-VI each with 20-28, 18-30, 94-139, 30-40, 34-40, 25-35+2-3 setae, respectively; apex of PT with 3-5 short blunt setae. Primary rhinaria elliptical, Ant. VI with 3-6 accessory rhinaria around primary rhinaria; secondary rhinaria almost round and protuberant in various sizes, basal diameter of secondary rhinaria about 0.006-0.038 mm, Ant. III-VI with 1-8, 2-11, 0-6 and 0-7 secondary rhinaria, respectively, along the distal part of Ant. III, the middle and distal part of Ant. IV, the entire length of Ant. V and Ant. VIb, respectively. Rostrum long, beyond hind coxae; URS wedge-shaped (Figs 4 , 20 ), with 2-3 pairs of primary setae and 10-14 accessory setae.

Thorax. Pronotum and mesonotum with a few scattered spinules; metanotum with spinulose imbrications and small scattered sclerites, pleural and marginal sclerites sometimes fused. Dorsal setae numerous, fine and pointed. Mesosternal furca with a short stem (Figs 5 , 21 ). Legs normal, with long and pointed setae. First tarsal chaetotaxy: 12-16, 9-14, 8-10; first fore tarsal segments with 6-9 peg-like setae and 5-8 long setae, first mid-tarsal segments with 3-6 peg-like setae and 5-9 long setae, first hind tarsal segments with 1-3 peg-like setae and 6-9 long setae.

Abdomen. Abdominal tergites I-VI with spinulose imbrications (Figs 7 , 23 ), tergites VII, VIII and venter with spinulose stripes. Abdominal tergites I-III with a few small scattered sclerites, sclerites on tergite III more obvious than tergites I and II; tergites IV-VII with scattered sclerites, pleural and marginal sclerites often incompletely fused (Fig. 16 ), sometimes sclerites reduced (Fig. 17 ); tergite VIII with a transverse band; intersegmental muscle sclerites small and dark. Dorsal setae numerous, long and pointed. Abdominal tergite VIII with 31-54 setae. Spiracles round to oval, open or closed, on brown spiracular plates. Siphunculi truncate, on dark brown seta-bearing cones, with flange and transverse striae (Figs 8 , 24 ), surrounding by 88-142 setae. Cauda round with spinulose stripes, with 28-36 long or short setae (Figs 9 , 25 ). Anal plate broadly round with spinules, with 66-88 long or short setae (Figs 10 , 26 ). Genital plate transverse elliptical with spinulose stripes, with 100-129 setae (Fig. 27 ). Genopophyses three, each with 10-14, 9-12, 8-13 setae, respectively.

Alate viviparous female: Body elongate-oval, brown in life, with dark brown siphunculi (Fig. 35 ).

Mounted specimens. Head, antennae, rostral segments III-V, thorax, legs except basal half of tibiae, siphunculi, cauda, anal plate and genital plate dark brown, other parts pale brown; dorsal setae on abdominal tergites bearing dark base-sclerites. For morphometric data, see Table 1 .

Head. Head dorsum smooth with an obvious dark median suture. Head with 70-88 long and pointed dorsal setae. Frons flat. Ocular tubercles well developed. Antennae almost smooth (Figs 11 , 29 ), distal part of Ant. II with polygonal reticulations and distinct on dorsal, obvious or weak on ventral; basal part of Ant. III and PT with transverse striae. Antennal setae long and pointed, Ant. I-VI each with 22-24, 18-29, 88-129, 21-38, 33-43, 24-32+2-3 setae, respectively; apex of PT with 4-6 short blunt setae. Primary rhinaria elliptical, Ant. VI with 5 accessory rhinaria around primary rhinaria; secondary rhinaria almost round and protuberant in various sizes, basal diameter of secondary rhinaria about 0.008-0.046 mm, Ant. III-VI with 29-54, 5-18, 3-14, 4-8 secondary rhinaria respectively along the entire length of Ant. III-V and base of Ant. VI. Rostrum long, reaching hind coxae; URS wedge-shaped, with 3 pairs of primary setae and 9-12 accessory setae.

Thorax. Legs normal, with long and pointed setae. First tarsal chaetotaxy: 10-15, 10, 6-9; first fore tarsal segments with 6-11 peg-like setae and 4 or 5 long setae, first mid-tarsal segments with 4 or 5 peg-like setae and 5 or 6 long setae, first hind tarsal segments with 2 peg-like setae and 4-7 long setae. Wings with scaly imbrications entirely (Fig. 28 ); campaniform sensilla near the base of subcosta slightly protuberant (Fig. 30 ), fore wings and hind wings with 10-13 and 11-20 campaniform sensilla on basal part, respectively; fore wings with pale media twice branched and faint on basal part (Fig. 12 ), pterostigma with 25-27 setae; hind wings with two oblique veins.

Abdomen. Abdominal tergites smooth, tergites I-VI with polygonal reticulations (Figs 13 , 31 ), tergites VII, VIII and venter with spinulose stripes. Abdominal tergites II-IV each with 1 pair of marginal sclerites, sclerites on tergite IV relatively smaller, tergite VIII with a transverse band; intersegmental muscle sclerites small and dark. Dorsal setae on abdomen long and pointed, relatively sparse than on venter. Abdominal tergite VIII with 29-33 setae. Spiracles round and closed, on brown spiracular plates. Siphunculi truncate, on dark brown seta-bearing cones, with flange and transverse striae, surrounding by 123-156 setae. Cauda elliptical with spinulose stripes, with 26-30 long or short setae (Figs 14 , 32 ). Anal plate broadly round with spinules, with 54-64 setae (Figs 15 , 33 ). Genital plate transverse elliptical with spinulose stripes, with 87-105 setae. Genopophyses three, each with 12, 14, 12 setae.

Distribution.

China (Shaanxi, Sichuan).

Host plant.

Rubus sp. ( Rosaceae ).

Biology.

The species feeds on roots of host plants and was visited by ants.

Comments.

Apterae of the new species are related to Sinolachnus rubi in having abdominal tergites with scattered sclerites and sometimes fused. Sinolachnus rubi was originally regarded as a member of Maculolachnus , but transferred to Sinolachnus by Kanturski et al. (2022 [2023]). Based on the detailed description, the new species obviously differs from S. rubi as follows: femora and basal half of tibiae pale yellowish-brown, distal half of tibiae dark brown (the latter: basal half of femora slightly pale, distal half of femora and tibiae dark brown); HT Ib 2.26-3.47 times as long as HT Id (the latter: 1.80-2.00 times); HT II 0.31-0.37 mm in length, URS 0.65-0.81 times as long as HT II (the latter: HT II 0.23-0.28 mm in length, URS 0.83-0.96 times as long as HT II); abdominal tergites I-III with a few small scattered sclerites, tergites IV-VII with scattered sclerites, pleural and marginal sclerites often incompletely fused (the latter: abdominal tergites with many small scattered sclerites, often fused in spinal parts, form bands on tergites I and VII), tergite VIII with 31-54 setae (the latter: 18-20 setae). In addition, two mentioned species specially infest Rubus sp., the new species feeds on roots of host plants, while S. rubi was recorded from apical stems.

Figures

Figures 1 - 15. Sinolachnus rubusis Qiao & Li, sp. nov. Apterous viviparous female: 1 dorsal view of head 2 antenna 3 Ant. II, distal reticulations and setae shown 4 URS 5 mesosternal furca 6 hind first tarsal segment 7 spinulose imbrications and setae on abdominal tergites 8 siphunculus 9 cauda 10 anal plate. Alate viviparous female: 11 antenna 12 fore wing 13 reticulations and setae on abdominal tergites 14 cauda 15 anal plate. Scale bars: 0.10 mm (1 - 11, 13 - 15); 0.50 mm (12). (All figures were drawn according to type material No. 37534).

Figures 16 - 27. Sinolachnus rubusis Qiao & Li, sp. nov. Apterous viviparous female: 16 dorsal view of body with large fused sclerites 17 dorsal view of body with scattered sclerites 18 dorsal view of head 19 antenna 20 URS 21 mesosternal furca 22 hind tarsi and claws 23 spinulose imbrications on abdominal tergites 24 siphunculus 25 cauda 26 anal plate 27 genital plate. Scale bars: 1.00 mm (16, 17); 0.10 mm (18 - 27). (All figures were photographed according to type material No. 37534)

Figures 28 - 33. Sinolachnus rubusis Qiao & Li, sp. nov. Alate viviparous female: 28 dorsal view of body 29 antenna 30 sensilla on subcostal of fore wing 31 reticulations on abdominal tergites 32 cauda 33 anal plate. Scale bars: 1.00 mm (28); 0.10 mm (29 - 33). (All figures were photographed according to type material No. 37534)

Figures 34 - 35. Sinolachnus rubusis Qiao & Li, sp. nov. 34 a colony on the root of the host, visited by ants 35 alate viviparous female.