Ceratovacuna angusticorna Qiao

Jiang, Liyun, Chen, Jing, Guo, Kun & Qiao, Gexia, 2015, Review of the genus Ceratovacuna (Hemiptera: Aphididae) with descriptions of five new species from China, Zootaxa 3986 (1), pp. 35-60 : 36-39

Ceratovacuna angusticorna Qiao sp. n.

( Figures 1–20 , Table 1)

Apterous viviparous female. Body reddish brown, bearing white wax tufts in life.

Mounted specimens: Body oval ( Fig. 11 ), 1.58–1.74 times as long as its width. Head and pronotum fused ( Figs 1 , 12 ). Dorsum of head, frontal horns, antenna, eyes, rostrum, legs, apex of siphunculi brown, the other parts pale brown. Dorsum of body with wax gland plates on grey sclerites, composed of round or polygonal wax gland facets ( Figs 6, 7 , 16 ). Dorsum of head with 1 pair of wax gland plates between eyes, composed with 8–16 small facets; pronotum and mesonotum each with 1 pair of spinal and marginal wax gland plates, composed with 9–15 facets; metanotum and abdominal tergites I–VI each with 1 pair of spinal, pleural and marginal wax gland plates. Abdominal tergites I–III each with spinal wax gland plates composed with 5–9 facets; tergites IV–VI each with spinal wax gland plates composed with 7–11 facets. Spinal glands on tergites IV–VI fused. Pleural wax gland plates each composed with 4–6 facets. Marginal wax gland plates on abdominal tergites I–VII each with 4–9 facets. Abdominal tergite VIII with one wax gland plate composed with 13–15 facets. Diameter of wax gland facets on dorsum of head 0.20, those on abdominal tergites 0.44. Dorsal setae of body short. Head with 5–6 pairs of dorsal setae; pronotum with 2 pairs of spinal, 1 pair of pleural and 2 pairs of marginal setae; mesonotum, metanotum and abdominal tergites I–IV each with 1 pair of spinal, 1 pair of pleural and 2 pairs of marginal setae; tergites V–VI each with 1 pair of spinal, pleural and marginal setae; tergite VII with 1 pair of spinal and marginal setae; tergite VIII with 1 pair of spinal and 3 pairs of marginal setae; cephalic setae, marginal setae on abdominal tergite I, setae on abdominal tergite VIII 2.50, 2.50 and 2.25–3.00 times as long as basal diameter of antennal segment III, respectively. Spiracles round, open, on pale brown spiracular plates.

Head. Head with 1 pair of frontal horns ( Figs 2 , 13 ), 0.50–0.53 times as long as its basal width, 0.57–0.83 times as long as antennal segment II. Antenna 4–segmented ( Figs 3 , 14 ), 0.12–0.17 times as long as body; segments I–IV each with 2, 2 or 3, 2–4, 1+0 setae, respectively; setae on segment III 0.75–1.00 times as long as basal diameter of the segment; segments III and IV each with one non-ciliated primary rhinarium; processus terminalis 0.30–0.43 times as long as base of the segment IV, with 4 or 5 apical setae. Rostrum short, reaching over fore coxae; ultimate rostral segment wedge-shaped ( Figs 4 , 15 ), 0.80–1.43 times as long as its basal width, 0.46– 0.80 times as long as second hind tarsal segment; with 3 pairs of primary setae and without secondary setae.

Thorax. Mesosternal furca pale brown, with two arms separated ( Fig. 5 ), each arm 3.70 times as long as basal diameter of antennal segment III. Legs smooth, with a few setae; trochanter and femur fused, hind trochanter and femur 3.76–4.47 times as long as antennal segment III; hind tibia 0.21–0.31 times as long as body; setae on hind tibia 1.00–1.08 times as long as its mid-diameter. First tarsal chaetotaxy: 3, 3, 2.

Abdomen. Siphunculi ring-like ( Figs 8 , 17 ), on abdominal tergite V, apical diameter 2.00–2.50 times as long as basal diameter of antennal segment III. Cauda, anal plate and genital plate with spinules. Cauda knobbed ( Figs 9 , 18 ), constricted at base, 0.57–0.64 times as long as its basal width, with 18–22 long and short setae. Anal plate bilobed ( Figs 10 , 19 ), with 23–30 long and short setae.

Holotype. CHINA: Apterous vivipara, Fujian (Mt. Wuyishan), on Indocalamus tessellatus (Munro) Keng , 24.v.2004 (Guo K) [No. 14804–1–1–1]. Paratypes. CHINA: 1 apterous vivipara, [No. 14804]; 4 apterous viviparae, on Indocalamus tessellatus (Munro) Keng , 24.v.2004 (Guo K) [No. 14774]; 6 apterous viviparae, on Indocalamus tessellatus (Munro) Keng , 23.v.2004 (Guo K) [No. 14792]; 3 apterous viviparae and 3 apterous viviparae ( BMNH), on Indocalamus tessellatus (Munro) Keng , 23.v.2004 (Guo K) [No. 14786]; 2 apterous viviparae, on Indocalamus tessellatus (Munro) Keng , 23.v.2004 (Guo K) [No. 14791]; 3 apterous viviparae, on one kind of bamboo, 19.vii.2003 (Qiao GX & Huang XL) [No. 14535]; 1 apterous vivipara, 12.vi.2011 (Chen J, Liu QH & Li XT) [No. 26876]; 1 apterous vivipara, Guizhou (Kuankuoshui), on one kind of bamboo, 9.vi.2010 (Su XM) [No. 24596]; 1 apterous vivipara, Guizhou (Kuankuoshui), on one kind of bamboo, 14.viii.2010 (Su XM) [No. 25626]; the other information same as holotype.

Distribution. China (Fujian, Guizhou).

Biology. The new species feeds on the underside of the leaf bases of Indocalamus tessellatus (Munro) Keng (Poaceae) , and on another species of bamboo.

Etymology. The new species, Ceratovacuna angusticorna is named following the shape of its horns, “ angusti - (Latin word)” means narrow, “ corna (Latin word)” means horn.

Remarks. The new species is most similar to Ceratovacuna silvestrii in the wax gland plates between eyes composed of 8–16 facets and abdominal tergites I–VI with pleural wax gland plates, but differs from C. silvestrii as follows: frontal horns pointed ( C. silvestrii : frontal horns blunt), and diameter of wax gland facets on dorsum of head shorter than 0.50 times of those on abdominal tergites ( C. silvestrii : similar to those on abdominal tergites).

Figures

FIGURES 1 – 10. Ceratovacuna angusticorna Qiao sp. n. Apterous viviparous female: (1) dorsal view of head and prothorax; (2) frontal horn; (3) antenna; (4) ultimate rostral segment; (5) mesosternal furca; (6) dorsal view of abdomen; (7) dorsal view of abdominal tergite VIII; (8) siphunculus; (9) cauda; (10) anal plate. Scale bars = 0.10 mm.

FIGURES 11 – 20. Ceratovacuna angusticorna Qiao sp. n. Apterous viviparous female: (11) dorsal view of body; (12) dorsal view of head and prothorax; (13) frontal horns; (14) antenna; (15) ultimate rostral segment; (16) wax gland plate on abdominal tergite; (17) siphunculus; (18) cauda; (19) anal plate; (20) genital plate. Scale bars = 0.10 mm.