First fossil representative of the net-winged beetles genus Plateros Bourgeois, 1879 (Insecta: Coleoptera: Lycidae) from Mexican amber, with redescription of Electropteron avus gen. n., sp. n. from Dominican amber and a note on the time of origin of the family Author Kazantsev, S. V. text Russian Entomological Journal 2020 2020-12-31 29 4 377 387 http://dx.doi.org/10.15298/rusentj.29.4.04 journal article 10.15298/rusentj.29.4.04 0132-8069 13165470 Plateros jardinesi Kazantsev , sp.n. Figs 1 –6. MATERIAL: Holotype , ♂ , specimen No. MLSC 0001, Mexican amber, Early Miocene , Simojovel area , Chiapas , Mexico ) ( MLSC ); Paratype , ♀ , same data, in copula with the Holotype ( MLSC ) . SYNINCLUSIONS. Several Hymenoptera and Diptera . DESCRIPTION. Male. Dark brown to black ( Figs 2–4 ). Head transverse, narrowed posteriorly. Eyes moderately large, eye diameter ca. 1.5 times smaller than head width behind eyes. Mandibles slender, relatively long, evenly round- ed. Palps slender, ultimate palpomeres securiform, distally noticeably narrowed. Antennae 11–segmented, slightly dentate, extending to elytral two fifths, with antennomere 3 ca. 1.6 times longer than pedicel (antennomere 2) and ca 1.5 times shorter than antennomere 4; antennal pubescence relatively short and suberect ( Figs 2–4 ). Pronotum transverse, semicircular, with explanate sides, rounded anterior and short rectangular posterior angles ( Figs 2–4 ). Elytra elongate, ca. 4 times longer than wide, somewhat narrowing distally, with almost equally developed and almost converging near apex primary costae, interstices with double rows of small subquadrate cells; uniform suberect pubescence ( Figs 2–4 ). Legs relatively short, with robust femora and narrow tibiae, tibiae and femora straight, subequal in length; hind tarsomere ratio: 2: 1.6: 1.1: 1: 2.4; tibiae with distinct spurs; tarsomeres 2–4 conspicuously widened, tarsomeres 2–4 split almost to base; claws simple ( Figs 2–4 ). Ultimate tergite triangularly incised distally; ultimate ventrite oval, narrowing distally ( Figs 2–5 ). Aedeagus with noticeably bent and dented about the middle median lobe, with robust proximal and narrower distal halves (apex of median lobe and phallobase obscured by overlaying segments) ( Figs 5 –6). Length (from anterior head margin to end of elytra): 5.3 (male)–6.2 (female) mm; width (at humeri): 1.4 (male)–1.5 (female) mm. Female.Similar to male, but somewhat larger, with smaller eyes and somewhat shorter and less dentate antennae. External genitalia elongate coxites and elongate tapering distally styli with a bunch of long hairs at apex ( Fig. 5 ). Fig.1. General view of the amber piece with Plateros jardinesi sp.n. Рис. 1. ОбЩий вид обраЗца ЯнтарЯ с Plateros jardinesi sp.n. ETYMOLOGY. The new species is named after Mr. Antonio Ramirez Jardines (San Cristobal, Chiapas , Mexico ) through whose courtesy I was able to study the Mexican amber inclusions under his care. DIAGNOSIS. Plateros jardinezi sp.n. seems to resemble P . cadenai Zaragoza Caballero, 1999 in the shape of the aedeagus [ Zaragoza Caballero, 1999 ], but is easily separable by the distinctly more robust proximal and straighter distal halves of the median lobe of the aedeagus ( Figs 5 –6). Fig. 2. General view of Plateros jardinesi sp.n. , holotype male (above) and paratype female (below) in copula. Рис. 2. ОбЩий вид Plateros jardinesi sp.n. , голотип, самец (сверху) и паратип, самка (сниЗу), во времЯ копулЯции. Figs 3–4. General view of Plateros jardinesi sp.n. , 3 - holotype male, dorso-laterally; 4 - paratype female, dorsally. Рис. 3–4. ОбЩий вид Plateros jardinesi sp.n. , голотип, самец (сверху) и паратип, самка (сниЗу), во времЯ копулЯции. REMARKS. The inclusion is well preserved in a relatively large, 30×19× 11 mm , almost rectangular and clear amber piece. Leptolycinae Leng et Mutchler, 1921 Leptolycini Leng et Mutchler, 1921