Chrysolina (Hypericia) changbaishana Mikhailov, 2024

Mikhailov, Yu. E., 2024, REVIEW OF LEAF BEETLES OF THE SUBGENUS HYPERICIA BEDEL, 1899 (COLEOPTERA: CHRYSOMELIDAE: CHRYSOLINA) FROM EAST ASIA, Far Eastern Entomologist 499, pp. 1-18 : 9-10

Chrysolina (Hypericia) changbaishana Mikhailov , sp. n.

https://zoobank.org/NomenclaturalActs/ E87DC5FA-8AC1-4F69-8BF8-2E20A6F24021

Figs 6 , 10

TYPE MATERIAL. Holotype: ♂, with labels: China: Jilin Prov., / S of Erdaobaihe / Town 800 m, / 42,40º N, 128,106º E / 17.07.2012 / R. Dudko leg. [p] | HOLOTYPUS / Chrysolina (Hypericia) / changbaishana sp. n. / Yu. Mikhailov design. 2022 [p, r] ( ISEA).

DESCRIPTION. Male (holotype) ( Fig. 6 ). Moderately convex, ovate. Body length – 6.2 mm, width – 4.0 mm. Dorsum shining, smooth, bicolor, elytra bronze, pronotum and head blackish violet; underside and legs black, with feeble greenish reflex. Antennae, maxillary palpi and tarsi dark brown.

Head: frontoclypeus finely and sparsely punctured with smooth median stripe; frontal and epicranial sutures slightly deepened. Last maxillary palpomere axe-shaped, apically truncated, 1.2x longer then broad, 1.4 x longer and 1.2x wider than previous palpomere. Relative length of antennomeres 1–3 as ratios 7, 4, 6. Tenth antennomere 2x longer than broad, eleventh antennomere – 3.1x. Orbital lines short and narrow, far not reach antennal insertion. Antenna inserted 1.2x closer to eye than to clypeus.

Thorax: pronotum transverse, twice broader than long, broadest behind middle; slightly rounded laterally, almost straight basally and apically; pronotal disc evenly convex, covered with dense fine punctures; 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 convex. Lateral sides steeply swollen along entire length, lateral callus narrow, separated from disc by deep groove with vertical outer border in basal 2/5 and by broad almost obsolete impression with large punctures in anterior part. Prothoracic hypomera with longitudinal furrow, outer side slightly convex and smooth, basal 1/4 covered with coarse wrinkles; basal fold short and moderately deep; prosternal process narrow, slightly convex longitudinally; anterolateral portion of prosternum with convex bulge medially; prosternum 1.3x shorter than metasternum; metasternum of the same length as first ventrite, smooth.

Elytra with weak humeral callus, each elytron 2.1 times longer than wide, elytral length 4.7 mm. Large primary punctures form scutellar row of 8 punctures and 9 regular paired rows. Punctures in rows sparsely placed. 5th puncture row consists of 24–26 punctures. Secondary punctures fine and sparse (same as on pronotum) on wider intervals and very fine on narrow intervals between paired rows. Marginal stria with large sparse impressed punctures. Sutural stria distinct at apical slope. Epipleura inclined outside, visible along entire length. Hind wings developed.

Tarsi narrow, fore tarsi (tarsomeres 1–3) 2.6x as long as broad; ratio of width of fore tarsomeres 1–3 as 1.5, 1.3, 2.0. All tarsomeres with entire sole beneath.

Abdomen: pygidium with impression in basal 2/3. Ventrite 1 broadly margined on anterior edge, covered with very sparse fine punctures, only anterior intercoxal process covered with medium-sized punctures. Last ventrite evenly convex, with slightly incised apex, smooth, covered with very sparse fine punctures. Aedeagus ( Fig. 10 ).

DIFFERENTIAL DIAGNOSIS. From Ch. difficilis ( Fig. 7 ) also found in Jilin Province is readily distinguished by smaller size, narrow scutellum, longer and narrower distinctly rounded apical projection of aedeagus ( Fig. 10 ) and narrow, very steeply swollen lateral calli of pronotum. In Ch. difficilis pronotal lateral calli are broader and flatter. Body size of the new species is closer to Ch. nikkoensis , presented below, which has different combination of dorsal punctation (larger elytral and smaller pronotal one) and broad apical projection of eadeagus ( Figs 11, 12 ).

ETYMOLOGY. The name is derived from the Changbai Mountains (Changbaishan), in the foothills of which the type locality is situated.

REMARKS. In Japan two Hypericia species are known ( Saitoh, 2012), namely Ch. difficilis and Ch. nikkoensis ( Jacoby, 1885) . The latter is described and known mainly from Honshu with only few records from Hokkaido ( Hirano, 2003; Araki et al., 2013). No Hypericia species have been recorded from the Kurile Islands so far. But as a part of long term entomological survey in South Kurile Islands organized by Dr. Kirill Makarov ( MPSU) in the year 2012 a series of relatively small beetles ( Figs 13, 14 ) from the genus Chrysolina was collected by Dr. Yuri Sundukov in Shikotan Island. After careful examination these beetles proved to be Ch. nikkoensis .

Although the place of housing of Jacoby’s collection is well known, the types of Ch. nikkoensis have not been controlled so far ( Kimoto & Takizawa, 1994; Saitoh, 2012; Bienkowski, 2019). Thanks to Dr. Michael Geiser ( NHMUK) I got the opportunity to study the types ( Figs. 15, 16 ) and therefore can exactly prove the identity of the beetles from Shikotan. This is the first record not only for Kurile Islands but for the fauna of Russia as well.

Figures

Figs 6–7. Habitus in dorsal view. 6 – Chrysolina changbaishana sp. n., holotype, male (S of Erdaobaihe, Jilin province, China); 7 – Ch. difficilis Motschulsky, male (Naitoushan Mts., Jilin province, China). Scale bar = 1 mm.

Figs 8–12. Aedeagus in dorsal and lateral view. 8 – Chrysolina difficilis Motschulsky (Lazo village, Maritime province, Russia); 9 – Ch. difficilis (Naitoushan Mts., Jilin Province, China); 10 – Ch. changbaishana sp. n., holotype (S of Erdaobaihe, Jilin Province, China); 11, 12 – Chrysolina nikkoensis Jacoby (Krabovaya bay, Shikotan Island, Russia). Scale bar = 1 mm.

Figs 13–16. Habitus in dorsal view of Chrysolina nikkoensis Jacoby. 13, 14 – male and female from Shikotan Island, South Kurile Islands; 15, 16 – syntypes, males from Japan. Scale bar = 2 mm. 11