Plateros baolokensis Kazantsev, 2021

Kazantsev, S. V., 2021, A review of Plateros Bourgeois, 1879 of Indochina (Coleoptera: Lycidae), Russian Entomological Journal 30 (1), pp. 47-73 : 53

Plateros baolokensis Kazantsev , sp.n.

Figs 58 , 183–184 .

MATERIAL: Holotype, ♂, S Vietnam, Bao Lak, 1500 m, 24– 28.IV.1993, V. Siniaev leg. ( ICM); paratypes: ♀, N Laos, 20 km NW Luang Namtha, 800–1000 m, 4–12.V.1997, Strba & Hergovits leg.; ♀, C Laos, Khammouan Pr., env. Nakai , Rte No. 8, 17°42.8´N, 105°08.9´E, 540–580 m, 4–8.V.1998, M. Strba & R. Hergovits leg. ( ICM).

DESCRIPTION. Male. Dark brown to black; pronotum light brown with dark brown middle; elytra reddish brown, with dark brown longitudinal sutural stripes below scutellar area ( Fig. 58 ).

Vertex with conspicuous round impression behind antennal prominence. Eyes moderately large, interocular distance ca. 1.2 times shorter than eye diameter. Labrum small, transverse, convex anteriorly. Palps slender; ultimate palpomeres longer than wide, narrow and almost parallel-sided, obliquely convex and flattened at apex. Antennal sockets separated by minute lamina. Antennae long, attaining to elytral four fifths, antennomeres 4–10 ramose, with ramus of antennomere 3 ca. 2 times shorter than stem, ramus of antennomere 7 ca. 1.15 times shorter than stem; antennomere 3 ca. 3 times longer than antennomere 2 and ca. 1.1 times shorter than antennomere 4; antennomeres 3–11 with long sub-erect pubescence ( Fig. 58 ).

Pronotum transverse, ca. 1.4 times wider than long, trapezoidal, bisinuate basally and triangularly produced anteriorly, with prominent acute posterior and distinct blunt anterior angles. Scutellum transverse, parallel-sided, slightly incised at apex ( Fig. 58 ).

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 dense, short and decumbent, almost obscuring reticulation ( Fig. 58 ).

Legs slender; femoris and tibiae narrow, subequal in length ( Fig. 58 ).

Aedeagus asymmetrical, with narrow phallobase and contiguous phallobasal lateral plates; median lobe spiral, moderately robust, provided with spine at coil bend and toothed at distal bend; coil plane perpendicular to proximal portion ( Figs 183–184 ).

Female. Similar to male, but eyes smaller and antennae noticeably less dentate.

Length: 6.6–7.2 mm. Width (humerally): 1.5–1.8 mm.

ETYMOLOGY. The new species is named after the locality where the type series was collected.

DIAGNOSIS. Plateros baolokensis sp.n. may be separated from P. phungi Pic, 1923 , also with ramose antennae, by the more narrow body and darker pronotum ( Fig. 58 ), as well as by the conspicuously more twisted median lobe of the aedeagus ( Figs 183–184 ).

DISTRIBUTION. Southern Vietnam, 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.