Chrysolina (Chalcoidea) ivanovi Mikhailov, 2022

Mikhailov, Yu. E., 2022, Review of Chrysolina immarginata species group from the subgenus Chalcoidea (Coleoptera: Chrysomelidae) with description of a new species, Russian Entomological Journal 31 (3), pp. 278-282 : 280-282

Chrysolina (Chalcoidea) ivanovi Mikhailov sp.n.

Figs 5 , 10.

Holotype, ♂ with the labels: 1) Вост. КаЗахстан, 46 км ЮВ п. Маканчи, пески, 12.05.2017, А. В. Иванов [East Kazakhstan, 46 km SE Makanchi, sands, 12.05.2017, A. V. Ivanov ]; 2) HOLOTY- PUS, Chrysolina (Chalcoidea) ivanovi sp.n., Yu. Mikhailov design. 2021 [red] ( ZIN).

DESCRIPTION of holotype. Moderately convex, oblong ovate, dorsum shining, unicolor, black with bronze reflex, antennae, maxillary palpi and tarsi blackish brown, antennomeres 1 and 2 and claws reddish. Body length — 6.3 mm, width — 3.9 mm.

Head: frontoclypeus finely and sparsely punctured; frontal suture slightly deepened, epicranial suture barely indicat- ed. Last maxillary palpomere almost square, with rounded sides and truncated apex, 1.2x longer then broad, 1.4x longer and only 1.1x wider than previous palpomere. Antenna inserted 2.2x closer to clypeus than to eye. Relative length of antennomeres 1–3 as ratios 7, 4, 6. Tenth antennomere 2x longer than broad, eleventh antennomere — 2.6x. Orbital lines slightly deepened, short, can be traced only in distal 1/ 3 and far not reach antennal insertion.

Thorax:pronotum transverse, almost twice (exactly 1.97x) broader than long, broadest before middle, evenly rounded laterally; pronotal disc distinctly convex, covered with dense medium-sized and not deep punctures. Width between anterior angles 1.4x less than basal width. Anterior angles moderately produced, rounded triangular; basal angles obtuse. Both anterior and posterior setiferous pores bear short setae. Anterior side widely margined and ciliate, incised in bracketshape; basal edge moderately arcuately convex. Lateral sides

10 11 12 13

swollen along entire length, lateral calli narrow, both constitute slightly less than ¼ of basal width of pronotum. Lateral impressions in basal 1/3 moderately deepened, consist of coarse, partly merged deep punctures, in anterior part punctures are large but less deep and not merged. Prothoracic hypomera smooth, almost flat in the middle, slightly impressed along outside and covered with coarse transverse wrinkles; basal fold short and deep. Prosternal process with longitudinal impression only before apex; anterolateral portion of prosternum narrow, with slightly impressed furrow medially.Prosternum 1.4x shorter than metasternum; metasternum 1.3x shorter than as first ventrite. Scutellum triangular, 1.4x broader than long, with sharp apex and sparse fine punctures only at base.

Elytra slightly wider than base of pronotum, with weak humeral callus, each elytron 2.3x longer than wide, elytral length 4.7 mm. Large primary punctures form long scutellar row of 10–12 punctures and 9 paired rows. Rows mostly regular, only 6 th row slightly confused. Intervals flat, smooth, secondary punctures fine and sparse, but wider odd intervals are covered not only with fine but also with medium-sized punctures same as on pronotum. Marginal stria with large dense punctures. Sutural stria distinct at apical slope. Epipleura inclined outside, visible along entire length. Hind wings developed.

Tarsi narrow, fore tarsi 2.7x longer than broad; ratio of width of fore tarsomeres 1–3 as 1.0, 0.8, 1.2. 3 rd tarsomere 1.2x broader than long. All tarsomeres with entire sole beneath.

Abdomen: pygidium with deep impression along entire length. Ventrite 1 broadly margined anteriorly, covered with sparse fine punctures, only anterior intercoxal process covered with large wrinkles. Last ventrite distinctly and evenly convex, with slight transverse oval impression in the middle; its apex very slightly incised.

Aedeagus ( Fig. 5 ) 2.1 mm long, with long narrow apical process gradually narrowed towards slightly bent apex.

DIFFERENTIAL DIAGNOSIS. The new species is peculiar with very slighty dilated tarsi (in Ch. immarginata tarsi more dilated, fore tarsomere 3 is 1.4–1.6x broader than long) and aedeagus smaller (2.1 mm long instead of 2.5–3.0 mm in Ch. immarginata ) and narrower than in other species of the group; its apical process is long and narrow, gradually narrowed towards apex (neither spoon shaped as in Ch. immarginata , nor short and broad as in Ch. dieckmanni and Ch. alaiensis ). Also relatively large primary punctures on elytra and distinctly convex pronotal disc covered with medium sized punctures are peculiar; setiferous pores bear short setae (in Ch. immarginata — long setae).

ETYMOLOGY. The species is dedicated to Alexander Vladimirovich Ivanov, an entomologist from the Institute of Plant and Animal Ecology UB RAS (Yekaterinburg), active researcher of the fauna of Kazakhstan and Central Asia, who passed away in 2021.

Figures

Figs 1–5. Chrysolina immarginata species group, aedeagus in dorsal and lateral view: 1 — Ch. immarginata; 2 — Ch. dieckmanni; 3 — Ch. alaiensis; 4 — Ch. luchti; 5 — Ch. ivanovi sp.n. (4 — after Lopatin, 2000, others original). Scale bar — 1mm. Рис. 1–5. ВидоваЯ группа Chrysolina immarginata, Эдеагус сверху и сбоку: 1 — Ch. immarginata; 2 — Ch. dieckmanni; 3 — Ch. alaiensis; 4 — Ch. luchti; 5 — Ch. ivanovi sp.n. (4 — иЗ Лопатин, 2000, остальные — оригинал). МасШтаб — 1мм.