Plateros xenos Kazantsev, 2020

Kazantsev, S. V., 2020, New species of Plateros Bourgeois from Sulawesi (Coleoptera: Lycidae), Russian Entomological Journal 29 (2), pp. 161-172 : 170-172

Plateros xenos Kazantsev , sp.n.

Figs 36–38 .

MATERIAL: Holotype, ♂, [ Indonesia], Sulawesi Tengah, nr. Morowali, Ranu River Area , 27.I–20.IV.1980, M.J.D. Brendell, B.M. 1980–280 ( NHML); paratype, ♀, same label ( NHML).

DESCRIPTION. Male. Yellow testaceous; antennomeres 1–2 and abdomen light brown; antennomeres 3–11 dark brown ( Fig. 36 ).

Vertex with conspicuous round impression behind antennal prominence. Eyes moderately large, interocular distance ca. 1.5 times shorter than eye diameter. Labrum small, transverse, almost truncate anteriorly. Palps slender; ultimate palpomeres narrow, elongate, narrowing distally, widest in the middle. Antennal sockets separated by minute lamina. Antennae attaining to elytral three fourths, antennomeres 3–10 ramose, rami of antennomeres 5–7 subequal in length to stems; antennomere 3 (stem) ca. 3.3 times longer than antennomere 2 and ca. 1.5 times shorter than antennomere 4; antennomeres 3– 11 with relatively long erect pubescence ( Fig. 36 ).

Pronotum transverse, ca. 1.4 times as wide as long, trapezoidal, moderately bisinuate basally and noticeably semi-circularly produced anteriorly, with short acute posterior and distinct blunt anterior angles. Scutellum subquadrate, slightly narrowing distally, inconspicuously emarginate at apex ( Fig. 36 ).

Elytra long, ca. 3 times longer than wide at humeri, almost parallel-sided, with four equally developed primary costae, except noticeably stronger in proximal third humeral costa; interstices with even rows of small roundish cells; pubescence short and decumbent ( Fig. 36 ).

Legs slender, relatively long ( Fig. 36 ).

Median lobe of aedeagus elongate and narrow, slightly bent in distal fourth, without distinct swellings or dents ( Figs 37–38 ).

Female. Similar to male, but eyes smaller, with interocular distance subequal in length to eye diameter, and antennae serrate, with their pubescence shorter and decumbent.

Length: 4.2–4.8 mm. Width (humerally): 1.1–1.2 mm.

ETYMOLOGY. The name of the new species is derived from the Greek for´stranger´, alluding to the strange shape of its aedeagus.

DIAGNOSIS. Plateros xenos sp.n. is separable from P. princeps (Kleine, 1939) , also with long male antennal rami, by the smaller size, testaceous antennomeres 1–2, uniformly yellow head, legs, pronotum and elytra ( Fig. 36 ). It may be distinguished from the similarly coloured P. flavidus Kleine, 1933 , known only by the female holotype, by the smaller size, relative large female eyes and conspicuously produced forward anterior pronotal margin ( Fig. 36 ), while the male genital structures, with narrow simple slightly bent distally median lobe ( Figs 37–38 ), easily distinguish the new species from all Sulawesi congeners, where males have been described.

REMARKS. It is possible that the tip of the median lobe of aedeagus in the Holotype of P. xenos sp.n. is missing.

A KEY TO SPECIES OF PLATEROS FROM SULAWESI

1. Male antennae ramose ( Figs 8 , 14 ) ............................. 2

— Male antennae at most serrate (e.g. Figs 1–3 , 7 ) ........ 5

2. Upperside rusty red; male antennal rami at most 1.3 times shorter than relevant stems ( Fig. 8 ); aedeagus with more or less simple and straight median lobe, only noticeably widened and slightly bent in distal half ( Figs 27–28 ) ... ...................................................... P. rubiginosus sp.n.

— Upperside testaceous ................................................... 3

3. Male antennal rami about as long as relevant stems (e.g. Fig. 36 ) ......................................................................... 4

— Male antennal rami at most 2 times shorter than relevant stems ( Fig. 14 ); pronotum 1.6 times wider than long, anterior margin strongly produced forward, anterior angles conspicuous; aedeagus with conspicuously widened and twisted distal third ( Figs 31–32 ) ............................. .................................................. P. wartabonensis sp.n.

4. Larger (6.5 mm); antennae and head black, legs mostly black, with only basally yellowish femurs and tibiae, pronotal disk and elytral suture infuscated .................... ............................................ P. princeps (Kleine, 1939)

— Smaller (less than 5 mm); antennomeres 1–2 testaceous; head, legs, pronotum and elytra uniformly yellow ( Fig. 36 ); aedeagus with narrow, simple, only slightly bent median lobe ( Figs 37–38 ) ....................... P. xenos sp.n.

5. Elytra uniformly orange or yellow testaceous ( Figs 1 , 12 ) ...................................................................................... 6

— Elytra dark brown to black, sometimes with paler margins, at most testaceous with wide dark sutural stripe ( Figs 2–7 , 10 ) ...................................................................... 11

6. Female antennomeres 3–10 serrate, males unknown ... 7

— Female antennomeres 3–10 almost parallel-sided, male antennae at most serrate ............................................... 8

7. Legs dark; pronotum ca. 1.45 times wider than long, anterior pronotal angles inconspicuous ......................... .............................. P. toliensis Tvardik et Bocák, 2001

— Legs yellow; pronotum ca. 1.83 times wider than long, anterior pronotal angles distinct .................................... ............................................... P. flavidus Kleine, 1933

8. Legs uniformly yellow testaceous ( Fig. 33 ); aedeagus with relatively short and robust median lobe, with elongate rounded dents in distal half ( Figs 34–35 ) .............. ......................................................... P. xanthellus sp.n.

— At least some parts of legs dark (e.g. Fig. 1 ) .............. 9

9. Femurs and tibiae testaceous with dark distal parts ( Fig. 12 ); aedeagus with elongate narrow curved median lobe; phallobase with fused lateral sutures ( Figs 29–30 ) ....... ...................................................... P. unisuturalis sp.n.

— Femurs testaceous (e.g. Fig. 1 ); phallobase with nonfused lateral sutures (e.g. Figs 15–16, 27–28 ) .......... 10

10. Legs testaceous, except dark distal tarsomeres ( Fig. 1 ); aedeagus with conspicuously widened distal two thirds ( Figs 15–16) ............................. P. bantaengensis sp.n.

— Tibiae dark distally; aedeagus with inconspicuously widened distal third ......... P. lalui Tvardik et Bocák, 2001

11. Pronotum reddish, with dark spot ............................. 12

— Pronotum dark brown to black, at most with paler margins (e.g. Figs 2–6 ) ............................................................ 13

12. Pronotum narrowed anteriorly, with basal dark spot ..... .................................................. P. celebensis Pic, 1921

— Pronotum not narrowed anteriorly, with anterior dark spot ( Fig. 7 ); aedeagus with narrow straight medial lobe, abruptly bent distally, retroussé and dentate at apex ( Figs 25–26 ) ............................................ P. rimbaensis sp.n.

13. Elytra uniformly dark brown to black (e.g. Figs 2–3 ) .. 14

— Elytra dark brown to black with paler margins or apices, or testaceous with wide dark sutural stripe (e.g. Figs 5–6 , 10 ) .............................................................................. 19

14. Eye diameter greater than interocular distance (e.g. Fig. 2 ) .................................................................................... 15

— Eye diameter shorter than interocular distance (e.g. Fig. 4 ) .................................................................................... 17

15. Eye diameter 1.1 times greater than interocular distance; aedeagus slender, straight, widened distally .................. ......................... P. kalamensis Tvardik et Bocák, 2001

— Eye diameter 1.4–1.5 times greater than interocular distance ........................................................................... 16

16. Aedeagus with strongly curved and hooked distally medi- an lobe ................... P. milenae Tvardik et Bocák, 2001

— Median lobe of aedeagus relatively short and robust, with prominent toothed lobes in distal third ( Figs 17–18) .... ........................................................ P. curticauda sp.n.

17. Margins of pronotum lighter than disk; aedeagus slender .......................... P. orobuensis Tvardik et Bocák, 2001

— Pronotum uniformly black ......................................... 18

18. Antennomeres 3–10 serrate; aedeagus with robust, curved in apical half median lobe .............................................. ....................... P. mamasensis Tvardik et Bocák, 2001

— Antennomeres 3–10filiform ( Fig.4 ); aedeagus with straight median lobe, distinctly constricted in basal half, distally with dorsal hook and ventral triangular projection ( Figs 21–22) .................................... P. latimojongensis sp.n.

19. Elytra testaceous with wide dark sutural stripe ( Fig. 6 ) ........................................................ P. pangoensis sp.n.

— Elytra dark brown to black with paler margins or apices (e.g. Figs 3 , 5 , 10 ) ...................................................... 20

20. Elytra with paler apices ( Fig. 10 ) .... P. uluwayensis sp.n.

— Elytra dark with paler margins (e.g. Figs 3 , 5 ) ......... 21

21. Posterior pronotal angles strongly produced backwards ( Fig. 5 ); aedeagus with curved and hooked distally medi- an lobe, with two spines in proximal half and barbed hook ventrally ( Figs 23–24 ) ....... P. pallidimarginatus sp.n.

— Posterior pronotal angles only slightly produced backwards (e.g. Fig. 3 ) ...................................................... 22

22. Posterior pronotal angles long and narrow ( Fig. 3 ); aedeagus with relatively straight and narrow median lobe, conspicuously widened distally, provided with long and broad bidental blade ( Figs 19–20) .............. P. gorochovi sp.n.

— Posterior pronotal angles not very narrow ................ 23

23. Antennomeres 3–10 serrate; pronotal margins lighter than disk; aedeagus with slender, curved in the middle and widened distally median lobe; internal sac membranous .................... P. tanatorajensis Tvardik et Bocák, 2001

— Antennomeres 3–10 almost parallel-sided; pronotum uniformly black; aedeagus with robust median lobe; internal sac partly sclerotised ....................................................... .............. P. rubromamasensis Tvardik et Bocák, 2001

Figures

Figs 33–38. General view and aedeagi of Plateros, holotypes, males: 33–35 — P. xanthellus sp.n.; 36–38 — P. xenos sp.n.; 33, 36 — general view; 34–35, 37–39 — aedeagi; 33–34, 36–37 — dorsally; 35, 38 — laterally. Scale bars: 0.5 mm. Рис. 33–38. ОбЩий вид и Эдеагусы Plateros, голотипы, самцы: 33–35 — P. xanthellus sp.n.; 36–38 — P. xenos sp.n.; 33, 36 — обЩий вид; 34–35, 37–39 — Эдеагусы; 33–34, 36–37 — сверху; 35, 38 — сбоку. Масштабные линейки: 0.5 мм.

Figs 7–9. General view of Plateros: 7 — P. rimbaensis sp.n.; 8–9 — P. rubiginosus sp.n.; 7–8 — holotypes, males; 9 — paratype female. Рис. 7–9. ОбЩий вид Plateros: 7 — P. rimbaensis sp.n.; 8–9 — P. rubiginosus sp.n.; 7–8 — голотипы, самцы; 8 — паратип, самка.

Figs 10–14. General view and anterior part of body of Plateros, holotypes: 10–11 — P. uluwayensis sp.n.; 12–13 — P. unisuturalis sp.n.; 14 — X. wartabonensis sp.n.; 10, 12, 14 — general view; 11, 13 — anterior part of body, dorsally; 10–11 — female; 12–14 — males. Рис. 10–14. ОбЩий вид и переднЯЯ часть тела Plateros, голотипы: 10–11 — P. uluwayensis sp.n.; 12–13 — P. unisuturalis sp.n.; 14 — X. wartabonensis sp.n.; 10, 12, 14 — обЩий вид; 11, 13 — переднЯЯ часть тела, сверху; 10–11 — самка; 12–14 — самцы.

Figs 1–3. General view of Plateros, holotypes, males: 1 — P. bantaengensis sp.n.; 2 — P. curticauda sp.n.; 3 — P. gorochovi sp.n. Рис. 1–3. ОбЩий вид Plateros, голотипы, самцы: 1 — P. bantaengensis sp.n.; 2 — P. curticauda sp.n.; 3 — P. gorochovi sp.n.

Figs 23–32. Aedeagi of Plateros, holotypes, males: 23–24 — P. pallidimarginatus sp.n.; 25–26 — P. rimbaensis sp.n.; 27–28 — P. rubiginosus sp.n.; 29–30 — P. unisuturalis sp.n.; 31–32 — P. wartabonensis sp.n.; 23, 31 — dorsally; 25, 27, 29 — ventrally; 24, 26, 28, 30, 32 — laterally. Scale bars: 0.5 mm. Рис. 23–32. Эдеагусы Plateros, голотипы, самцы: 23–24 — P. pallidimarginatus sp.n.; 25–26 — P. rimbaensis sp.n.; 27–28 — P. rubiginosus sp.n.; 29–30 — P. unisuturalis sp.n.; 31–32 — P. wartabonensis sp.n.; 23, 31 — сверху; 25, 27, 29 — сниЗу; 24, 26, 28, 30, 32 — сбоку. Масштабные линейки: 0.5 мм.

Figs 4–6. General view of Plateros, holotypes: 4 — P. latimojongensis sp.n.; 5 — P. pallidimarginatus sp.n.; 6 — P. pangoensis sp.n.; 4–5 — males; 6 — female. Рис. 4–6. ОбЩий вид Plateros, голотипы: 4 — P. latimojongensis sp.n.; 5 — P. pallidimarginatus sp.n.; 6 — P. pangoensis sp.n.; 4–5 — самцы; 6 — самка.