Xerobion ulytavicum Kadyrbekov, 2021

Kadyrbekov, R. Kh., 2021, A new species of Xerobion Nevsky, 1928 (Hemiptera: Aphidoidea, Aphididae) from Kazakhstan, with a key to apterous viviparous females of the genus, Far Eastern Entomologist 431, pp. 10-16 : 11-13

Xerobion ulytavicum Kadyrbekov , sp. n.

http://zoobank.org/NomenclaturalActs/ 9AECB84E-A135-4731-ABBA-92DE681CE5EE

Figs 1–5

TYPE MATERIAL. Holotype – apterous viviparous female, preparation No. 5248,

Kazakhstan: Karaganda Region, Ulytau Mountains, 5 km south-west of Ulytau small town,

Galatella biflora , h~ 600 m, 10.VII 2015, leg. R. H. Kadyrbekov. Paratypes : 9 apterous viviparous females were collected together with the holotype.

DESCRIPTION. Apterous viviparous female (by 10 specimens). The body is widely oval, 1.0–1.5. The cuticle is cellular. The frons is slowly concave ( Fig. 1 ). Frontal setae

(0.01–0.02) are equal to or slightly larger than the diameter of the third segment of the antennae at the base (1.0–1.25). Antennae five- or six-segmented ( Fig. 2 ), 0.43–0.53 to body length. The following number of setae on the antennae: 1st 2–3, 2nd 2–3, 3rd 3–5, 4th 1–3,

5th 1–3, 6th 4–6. The third segment of the antennae is 0.1–0.15 to body length, 1.25–1.5

times longer than the fourth, 1.65–2.5 is longer than the processus terminalis, 0.65–0.95 to the sixth segment, or 1.06–1.14 to the fifth segment with five-segment antennae, also in 1.7–

3.4 exceeds the length of the tubes. The fourth antennal segment is 0.41–0.8 to the length of the 3rd segment. The fifth segment is 0.7–1.2 to the length of the base of the 6th antennal segment. The base of the last antennal segment is 0.53–1.0 to the length of the 3rd antennal segment. The processus terminalis is 0.55–0.65 to the base of the last antennal segment, 0.3–

0.6 to the 3rd antennal segment and equal to 0.11–0.15 of the width of the head between the eyes. The fourth segment of the antennae is 0.75–1.1 to the length of the fifth segment. Half of the specimens have a secondary rhinaria on the third (0–3), fourth (0–4), and occasionally,

on the fifth (0–1) antennal segments. The setae of the 3rd antennal segment (0.01) are 0.5–

0.6 of its diameter at the base. Clypeus normal, not enlarged, rostrum reaches medium coxae.

The ultimate rostral segment ( Fig. 3 ) is stocky, not styletous, 1.15–1.3 times longer than the second segment of the hind tarsum, 2.3–2.8 times of its own width at the base, 1.0–1.4 to the length of the base of the last antennal segment, 0.25–0.37 to the width of head between eyes,

1.8–3 times as long as siphunculi, with 2 additional setae. The siphunculi are short, volcano-

shaped, with clear flanges ( Fig. 4 ), are 0.04–0.06 to the body length, 0.11–0.13 to the head width between the eyes, 0.40–0.66 to the base of the last antennal segment, 0.4–0.75 to the cauda, 0.5–0.75 to their maximum width, 0.4–0.65 to the length of 2nd segment of hind tarsum. The cauda is shortly triangular ( Fig. 5 ); it is 0.5–0.75 to its own width at the base,

0.07–0.09 to the body length, 0.87–1.0 to the length of the 2nd segment of the hind tarsum,

with 15–20 setae. The marginal tubercles, almost flat, are present on the prothorax, on the 1st

and 7th abdominal tergites. The diameter of the marginal tubercle on the 7th tergite of the abdomen (0.02) is 0.7–0.8 times the diameter of the marginal tubercle on the 1st tergite, 1.2–

1.4 times the diameter of the 3rd antennal segment at the base. The setae on the 3–6th

abdominal tergites (0.02–0.03) are 1.25–1.50 times longer than the diameter of the 3rd antennal segment at the base. On the 8th tergite of the abdomen, 4 setae (0.02–0.04) 1.5–2 times the diameter of the 3rd antennal segment at the base. The subgenital plate is oval, with 2 setae on the disk and 4–7 setae on the posterior margin. Legs are normally developed. The posterior femur is 0.14–0.2 to body length and is equal to 0.68–0.76 the width of the head between the eyes. The hind tibia is 0.25–0.34 to body length, 1.20–1.39 times the width of the head between the eyes. The second segment of the hind tarsum is 0.75–1.0 to the base length of the last antennal segment. The lower hair of the hind trochanter (0.03–0.04) is 0.5–0.6 to the diameter of the trochanter-femur suture, the longest hair on the outer side of the posterior femur (0.02)

is 0.35–0.4 to the diameter of the trochanter-femur suture. First segment of tarsum with 3: 3:

2 setae.

3 – ultimate rostral segment; 4 – cauda; 5 – siphunculus.

DIMENSION (holotype and paratypes). Body 1.0–1.5, antennae 0.45–0.7: 3rd segment

0.1–0.17, 4th segment 0.07–0.12, 5th segment 0.07–0.13, 6th segment 0.16–0.19 (0.09–0.13

+ 0.05–0.08), base of 3rd antennal segment 0.015 –0.016, weight of head 0.44–0.53, siphunculi length 0.04–0.06, siphunculi width 0.05–0.09, cauda length 0.02–0.1, cauda width 0.07–0.17,

ultimate rostral segment 0.11–0.14, second segment of the hind tarsum 0.08–0.11, length of hind femur 0.26–0.33, length of hind tibia 0.45–0.63.

INTRAVITAL COLOR. The body is dark green with weak gray bloom, head, upper half of the 3rd, 4–6th antennal segments, clypeus, coxae, trochanter, femur except the base, base and top of the legs, tarsi, subgenital plate – are light brown, siphunculi are black, the cauda is green.

PREPARATION COLOR. Head, 1st, 2nd, upper half of 3rd, 4th–6th antennal segments,

clypeus, coxae, trochanters, femora except the base, base and tops of the tibiae, tarsi, subgenital plate, are light brown or brown; cauda is light.

DIAGNOSIS. The new species is similar to Xeroboin caspicae . It differs by the ultimate rostral segment, the ratio of the length of siphunculi and cauda (0.4–0.75 compared to 0.7–

1.0), the proportion of frontal setae to the diameter of the 3rd antennal segment at the base

(1.0–1.2 versus 0.7–1.0) and the lower hair on the trochanter of the hind legs to the diameter of the trochanter-femoral suture (0.5–0.6 versus 0.25), as well as a host plant belonging to another genus.

BIONOMY. Aphids live on the stems and peduncles of the saltflower Galatella biflora

(L.) Nees. ( Asteraceae ) visited by ants.

DISTRIBUTION. Kazakhstan: Kazakh low mountains, Ulytau Mountains.

ETYMOLOGY. The name of the species is derived from the name of the Ulytau Mountains, where it was collected.

Figures

Figs 1–5. Xerobion ulytavicum Kadyrbekov sp. n. 1 – head; 2 – 3rd-6th antennal segments;