Acaudinum rogeri, Kadyrbekov, 2022

Kadyrbekov, Rustem Kh., 2022, A new species of Acaudinum Börner (Hemiptera; Aphididae; Aphidinae) from Kazakhstan, Zootaxa 5183 (1), pp. 58-63 : 59-61

Acaudinum rogeri sp.n.

( Fig. 1 , Table 1 )

Type material. Holotype: apterous viviparous female, no 1846, Pavlodar region, 40 km to the south west from Shiderty small town, Serratula coronata , 29.07.1974., N.Е. Smailova (Institute of Zoology, Almaty, Kazakhstan) . Paratypes —9 apterous viviparous females, same place and date.

Etymology. The new species is named after the famous English aphidologist Roger Blackman.

Apterous viviparous femal e (from 10 specimens; for measurement see Table 1 ). During Colour in life, dark green aphids. On the slide: head, 1–3rd, the apex of the 4th, 5–6th antennal segments, clypeus, last, penultimate rostral segments, coxae, femora (except for the very base), base and apex of the tibiae, tarsi, siphunculi, theand genital plate is brown. Pro-, meso-, and metathorax have large marginal light-brown sclerites. trohanters, anal plate and cauda pale. Body oval ( Fig. 1 a ). Frontal groove slightly concave without antennal tubercles. The third antennal segment with 13–23 secondary rhinaria ( Fig. 1 c ). Rostrum long, reaching abdominal sternites 3 or 4, its ultimate rostral segment is elongated, slender, with 4–6 accessory hairs ( Fig. 1 b ). Ventral setae, and those on femora, tibiae, and trochanterics setae long. On femora and trochanters, setae are thin, pointed, and on the tibiae needle-like. Length of setae along the outer margin of hind femur 0.8–0.9 times as wide as femur at base; on hind tibia, length of setae 0.7–0.8 times as widest as of tibia in middle; on trochanters of hind legs, length of lower setae 0.83–0.85 times the diameter of the trochanter-femoral suture. There are 22–24 setae on the posterior margin of the genital plate, 8–10 on the anterior margin. Abdominal tergite 8 with 4–6 setae. The first segment of all tarsi with 3 setae. The cauda has 10–12 long setae.

Biology. This aphid lives on the leaves and base of stems of Serratula coronata L. ( Asteraceae ). It is attended by ants. The life cycle is unknown.

Taxonomical notes. The new species is close to A. (Acaudinum) longisetosum Holman, 1970 and A. (Acaudinum) roumanicum Holman, 1991 . It differs from both species URS/HII (1.47–1.71 versus 1.22–1.55), the number of accessory setae on last segment of rostrum (4–6 versus 2–5). Fewer setae on the anterior margin of genital plate (8–10 and 10–24). It also differs from A. longisetosum SIPH /BL (0.13–0.20 versus 0.20–0.30), fewer setae on cauda (10–12 and 13–17), and abdominal tergite 8 (4–6 in comparison with 5–9). From A. roumanicum it differs HII (0.14–0.19 mm and 0.12–0.15 mm). From A. centaureae (Koch, 1854) it is distinguished by setae on trochanters, femora, and ventral side of the body which is long and thin, and a fodder plant belonging to another genus of Asteraceae family.

Figures

FIGURE 1. Acaudinum rogeri sp. n.: a ‒ body; b ‒ ultimate rostral segment; c ‒ 3rd‒6th antennal segments; d ‒ siphunculus; e—genital plate; f ‒ cauda.