Chrysolina (Arctolina) tshingilica Mikhailov, 2021

Mikhailov, Yu. E., 2021, New and little known representatives of the genus Chrysolina Motschulsky, 1860 (Coleoptera: Chrysomelidae) from China, Far Eastern Entomologist 443, pp. 6-16 : 12-15

Chrysolina (Arctolina) tshingilica Mikhailov , sp. n.

http://zoobank.org/NomenclaturalActs/ 0124DA18-EF3B-48B8-B277-BD47EAAC6C80

Figs 7–10

TYPE MATERIAL. Holotype: ♂, with labels: China, Xinjiang, S Altai Mts. , / Keshtau

Mt., ENE Qinghe / (Chinggil), h= 2920–3345 m, / 46º48’30”N, 90º44’05”E / 46º46’16”N,

90º46’36”E / 12.08.2013 / I.I. Kabak leg. [p] | HOLOTYPUS / Chrysolina (Arctolina) /

tshingilica sp. n. / Yu. Mikhailov design. 2020 [p, r] ( ZIN). Paratypes, 1♂, 5♀ with labels:

locality label same as in holotype | PARATYPUS / Chrysolina (Arctolina) / tshingilica sp. n.

/ Yu. Mikhailov design. 2020 [p, r] ( YMC).

DESCRIPTION. Male (holotype) ( Fig. 7 ). Moderately convex, ovate. Body length - 5.9

mm, width - 3.8 mm. Dorsum shining, finely shagreened, bicolor, elytra emerald green,

pronotum and head green with violet reflex; underside and legs black, with feeble bronze reflex. Antennae, maxillary palpi and tarsi dark brown, antennomeres 1 and 2 beneath and claws rufous.

female (paratype). Scale bar = 1 mm.

Head: frontoclypeus coarsely and sparsely punctured; frontal and epicranial sutures slightly deepened. Last maxillary palpomere barrel-shaped, narrowly truncate apically, 1.2x longer then broad, 1.5x longer and 1.2x wider than previous palpomere. Relative length of antennomeres 1–3 as ratios 7, 3, 4. Tenth antennomere 1.5x longer than broad, eleventh antennomere –

2.1x. Orbital lines narrow, almost reach antennal insertion. Antenna inserted 1.2x closer to clypeus than to eye.

Thorax: pronotum transverse, almost twice (exactly 1.9x) broader than long, broadest anterior to middle; pronotal disc evenly convex, except for smooth ovate area medially covered with dense fine punctures; sides slightly rounded; width between anterior angles 1.5x less than basal width. Anterior angles moderately produced, rounded triangular; basal angles obtuse;

anterior side margined and ciliate, widely incised in bracket-shape; basal edge arcuately covex;

lateral sides swollen along entire length, lateral callus narrow, separated from disc by deep groove with vertical outer border in basal 2/5 and by slight impression with large punctures in anterior part. Prothoracic hypomera slightly convex, outer side almost flat and shagreened with impression at basal 1/4 covered with merged coarse punctures; basal fold pronounced and very deep; prosternal process slightly convex longitudinally; anterolateral portion of prosternum narrow, with slightly impressed furrow medially; prosternum 1.5x shorter than metasternum; metasternum of the same length as first ventrite. Scutellum triangular, with sparse, fine punctures.

sp. n.: 9 – holotype; 10 – paratype; 11 – Ch. (Pleurosticha) shapkini Mikhailov et Gus’kova

( Mongolia, Mongolian Altai); 12 – Ch. borochorensis Lopatin , paratype ( China, Tien-Shan

Mountains). Scale bars = 1 mm.

Elytra with very weak humeral callus and flat intervals, each elytron 2.25 times longer than wide, elytral length 4.2 mm. Medium-sized primary punctures form scutellar row of 8–9

punctures and 9 partly confused rows, from which rows 4 - 6 strongly confused. Secondary puncturation consists of very fine and fine punctures; latter almost of the same size as on pronotum, they predominate on odd intervals and together with fine wrinkles conceal puncture rows. Marginal stria with large sparse impressed punctures. Sutural stria distinct at apical slope. Epipleura inclined outside, visible along entire length. Hind wings absent.

Tarsi only slightly broadened, fore tarsi 2.5x as long as broad, ratio of width of fore tarsomeres 1–3 as 1.1, 0.9, 1.2. All tarsomeres with entire sole beneath.

Abdomen: pygidium without any impressions. Ventrite 1 broadly margined on anterior edge, covered with sparse medium-sized punctures, only anterior intercoxal process covered with large wrinkles. Last ventrite very slightly convex, with slightly incised apex, medially covered with sparse medium-sized punctures. Aedeagus ( Fig. 9 ) laterally crescent with slightly broadened rounded triangular apex and small alae.

Variability. Male (paratype). Body length 5.4 mm, width 3.5 mm. Dorsum shining, bicolor,

elytra violetish green, pronotum and head green with bronze reflex. Aedeagus slightly different from holotype ( Fig. 10 ).

Female. Body moderately convex, obovate; length 6.1–7.1 mm, width 4.0– 4.4 mm. Dorsum shining, finely shagreened, unicolor green with violet reflex, golden green or bicolor, elytra emerald green, pronotum and head green with violet or bronze reflex ( Fig. 8 ). Underside,

legs, antennae same colour as in males. Tarsi narrow, fore tarsi 2.3x as long as broad, ratio of width of fore tarsomeres 1–3 as 1.1, 0.9, 1.2. All tarsomeres with entire sole beneath.

DIFFERENTIAL DIAGNOSIS. Habitus and colour pattern is somewhat similar to the representatives of Allohypericia , namely Ch. centralasiae Lopatin, 1970 but pronotum structure and absence of wings readily distinguish the new species. The combination of characters makes it a member of the subgenus Arctolina and the first representative of this subgenus in the

Chinese part of Altai Mountains. The closely related subgenus Pleurosticha Motschulsky,

1860 also has the only representative Ch. shapkini Mikhailov et Gus’kova, 2013 recently described from Mongolian Altai (Hovd aimak of Mongolia). This species also has flat elytral intervals but peculiar aedeagus shape with larger and much more exposed alae ( Fig. 11 ).

Two previously known Chinese Arctolina species were found in Tien-Shan Mountains.

The combination of such peculiar characters as slightly broadened male tarsi, completely flat elytral intervals with confused rows of relatively small punctures, which are hardly visible and concealed by secondary puncturation, readily distinguish the new species in the subgenus.

Ch. borochorensis and Ch. boreosinica have somewhat similar aedeagus shape ( Fig. 12 ), but both have dilated male tarsi, regular rows of large and dense elytral punctures with flat or convex intervals and shallow pronotal impressions. In some species from Dzhungarian Alatau,

namely Ch. kryzhanovskii (Lopatin, 1968) and Ch. valichanovi Lopatin, 1990 , males also have flat elytral intervals, but in females intervals are convex. The new species has flat elytral intervals in both sexes and different aedeagus shape.

ETYMOLOGY. The name is derived from the Latinized common local name Chingil

(also Chinggil or Qingil) of the Qinghe County, where the type locality is situated.

Figures

Figs 7–8. Habitus of Chrysolina (Arctolina) tshingilica sp. n. 7 – male (holotype); 8 –

Figs 9–12. Aedeagus in lateral and dorsal view. 9, 10 –Chrysolina (Arctolina) tshingilica