Plateros leptohelix Kazantsev, 2021

Kazantsev, S. V., 2021, A review of Plateros Bourgeois, 1879 of Indochina (Coleoptera: Lycidae), Russian Entomological Journal 30 (1), pp. 47-73 : 61

Plateros leptohelix Kazantsev , sp.n.

Figs 63 , 179–180 .

MATERIAL: Holotype, ♂, NE Laos, Hua Phan prov., Ban Saleui, Phou Pan Mt. , ~ 20°12´N, 104°01´E, 1300–1900 m, 1– 31.05.2011, C. Holzschuh leg. ( ICM); paratypes, 10 ♂♂ and 9 ♀♀, same label ( ICM and ZIN).

DESCRIPTION. Male. Dark brown to black; pronotal margins narrowly light brown; elytra with reddish pubescence ( Fig. 63 ).

Vertex with conspicuous round impression behind antennal prominence and two minute deep round excavations at its bottom.Eyes relatively small, interocular distance ca. 1.4 times greater than eye diameter. Labrum small, transverse, convex anteriorly. Palps slender; ultimate palpomeres noticeably longer than wide, widening distally, obliquely convex and flattened at apex. Antennal sockets separated by minute lamina. Antennae attaining to elytral middle, dentate; antennomere 3 ca. 1.9 times longer than antennomere 2 and ca. 1.25 times shorter than antennomere 4; antennomeres 3–11 with short sub-erect pubescence ( Fig. 63 ).

Pronotum transverse, ca. 1.6 times wider than long, with almost straight sides, almost straight basally and somewhat semi-circularly produced anteriorly, with minute acute posterior and rounded anterior angles. Scutellum transverse, parallel-sided, slightly incised at apex (Fig.).

Elytra long, ca. 3.5 times longer than wide at humeri, almost parallel-sided; with four prominent, almost equally developed primary costae, noticeably stouter than secondary ones; interstices with even rows of irregular subquadrate or roundish cells; pubescence relatively scarce, short and decumbent ( Fig. 63 ).

Legs slender; femoris and tibiae narrow, subequal in length ( Fig. 63 ).

Aedeagus asymmetrical, with narrow phallobase and contiguous phallobasal lateral plates; median lobe spiral, slender, considerably widened and toothed in distal fourth, with minute tooth in the middle ( Figs 179–180 ).

Female. Similar to male, but eyes slightly smaller and antennae somewhat shorter with broader antennomeres.

Length: 6.0– 7.3 mm. Width (humerally): 1.5–1.8 mm.

ETYMOLOGY. The name of the new species is derived from the Greek for ‘slender’ and ‘spiral’, alluding to the structure of the median lobe of its aedeagus.

DIAGNOSIS. Plateros leptohelix sp.n. may be distinguished from the similarly coloured congeners with spiral aedeagi by its slender spiral, considerably widened distally, with a tooth at its middle ( Figs 179–180 ).

DISTRIBUTION. North-eastern Laos.

Figures

Figs 53–63. General view of Plateros, males: 53 — P. kabakovi; 54 — P. siniaevi sp.n.; 55 — P. abbreviatus sp.n.; 56 — P. gemellus sp.n.; 57 — P. propinquus; 58 — P. baolokensis sp.n.; 59 — P. merulus; 60 — P. macrolycoides sp.n.; 61 — P. phoupanensis sp.n.; 62 — P. leptohelix sp.n.; 63 — P. stenohelix sp.n.; 53–56, 58–63 — holotypes. Рис. 53–63. ОбЩий вид Plateros, самцы: 53 — P. kabakovi; 54 — P. siniaevi sp.n.; 55 — P. abbreviatus sp.n.; 56 — P. gemellus sp.n.; 57 — P. propinquus; 58 — P. baolokensis sp.n.; 59 — P. merulus; 60 — P. macrolycoides sp.n.; 61 — P. phoupanensis sp.n.; 62 — P. leptohelix sp.n.; 63 — P. stenohelix sp.n.; 53–56, 58–63 — голотипы.

Figs 169–188. Aedeagi of Plateros, ventrally and laterally, males: 169–170 — P. merulus; 171–172 — P. kabakovi; 173–174 — P. siniaevi sp.n.; 175–176 — P. abbreviatus sp.n.; 177–178 — P. phoupanensis sp.n.; 179–180 — P. leptohelix sp.n.; 181–182 — P. stenohelix sp.n.; 183–184 — P. baolokensis sp.n.; 185–186 — P. gemellus sp.n.; 187–188 — P. propinquus; 169–186 — holotypes. Scale: 0.5 mm. Рис. 169–188. Эдеагусы Plateros, сниЗу и сбоку, самцы: 169–170 — P. merulus; 171–172 — P. kabakovi; 173–174 — P. siniaevi sp.n.; 175–176 — P. abbreviatus sp.n.; 177–178 — P. phoupanensis sp.n.; 179–180 — P. leptohelix sp.n.; 181–182 — P. stenohelix sp.n.; 183– 184 — P. baolokensis sp.n.; 185–186 — P. gemellus sp.n.; 187–188 — P. propinquus; 169–186 — голотипы. МасштабнаЯ линейка: 0,.5 мм.