Nicotikis korshunovi Zinchenko

Zinchenko, Vadim, 2014, Review of species of the genus Nicotikis Marseul, 1883 (Coleoptera: Histeridae) from Southeast Asia, Zootaxa 3860 (5), pp. 487-492 : 489-491

Nicotikis korshunovi Zinchenko sp. n.

( Figs. 7–12 )

Type material. Holotype (male): length: PEL: 3.1 mm, the total length 3.5 mm. Width: EW: 2.0 mm. With two labels, as follows: 1. White, printed: “ Thailand, Prov., Nakhon Ratchasima (Korat), Nong Bun Nak Vil., h= 240 m, 14°41.4' N, 102°27.25' E [,] 9.06.2010[.] V.K. Zinchenko leg.” 2. Red, printed: “ HOLOTYPE Nicotikis korshunovi V. Zinchenko det. 2013” ( ISEA). Paratypes: 2 specimens: 1♂ ( Fig. 8 ), “ Thailand, Lampang Prov., 30 km SE Lampang City, near Nat. Park Wiang Kosui[,] h= 450 m, on rotten bamboo, 18°4'1.2'' N, 99°39'52.5'' E [,] 1.06.2010. V.K. Zinchenko leg”. ( ISEA). 1♂, “ Thailand Province Nakhon Savan[,] 20–26.12.[20]08[.] [A.V.] Korschunov leg. (CK).

Diagnosis. Nicotikis korshunovi closely resembles Nicotikis lackneri and N. kabakovi . N. korshunovi mainly differs from these species by having the fifth elytral stria extend beyond the middle of elytra and in having a long fourth and sutural stria. From N. kabakovi the new species also differs in the shape of antennal club and aedeagus.

Description. Length of body: PEL: 2.9–3.2 mm, total: 3.3–3.5 mm. Width: EW: 1.95–2.0 mm. Body ( Fig. 7 ) oblong, slightly convex medially, pitch-brown, shiny. Antennae and legs dark reddish-brown. Antennal club tomentose, with V-shaped sutures, sutures interrupted medially ( Fig. 10 ). Ratio of width of pronotum to head about 2.7–2.8. Frons concave, very finely and sparsely punctuate. Frontal stria of head complete, impressed and carinate medially. Labrum relatively wide, indistinctly emarginate anteriorly. Mandibles convex, finely but rather densely (0.5–2.0) punctulate. Pronotal sides weakly arcuate and convergent on basal two-thirds, thence acutely convergent anteriorly. Marginal pronotal stria complete laterally. Outer pronotal stria well impressed and sinuate at sides, united with apical pronotal stria, the last one a little carinato-crenate. Basal end of outer lateral stria more or less distinctly prolonged along the pronotal base for about 1/14 to 1/8 of its length. Pronotal disc sparsely covered with fine ground puncturation, almost smooth in middle. Epipleura tristriate, besides complete epipleural marginal and elytral marginal stria there is also a third complete stria. The last two subcariniform, all of them sinuate medially. Oblique and fine humeral stria present on basal quarter. Subhumeral striae absent. First to third dorsal striae complete and clearly impressed. Fourth and fifth dorsal striae distinct in posterior half the elytra, the fourth present on apical 2/7 to 1/2, the fifth one on apical 2/7 to 3/5. Sutural stria present on apical half, its apical portion shortened in 1/7 to 1/ 4, reaching almost to midlength of elytra. All dorsal striae crenate apically. Propygidium ( Fig. 9 ) irregularly covered with ocelloid, large and round punctures, rather densely distributed (0.2–2.0). Pygidium almost smooth or with some punctures medially, with very deep, enlarged fovea on each side, united basally by a row of large punctures. Prosternal lobe broad and convex medially, its anterior margin rounded. Disc with several deep, round punctures at sides, rather distributed (0.2–0.5). Marginal stria complete. Prosternal process narrow, with two carinal striae united basally. Two lateral striae present, their outer edge carinate. Mesosternum transverse and flat, its anterior margin emarginate. Marginal mesosternal stria bifurcate, interrupted medially where it is replaced by a median mesosternal stria composed of two parts ( Fig. 8 ). Meso-metasternal suture fine. Intercoxal disc of metasternum with a little impressed median line, doubly margined laterally. Lateral metasternal disc densely covered with deep and semicircular punctures. Intercoxal disc of 1st abdominal sternum with two striae on each side, the outer abbreviated basally.

Protibia with 5 spiny denticles on outer margin and a pair of spines at inner angle. Mesotibia with 4 (rarely 5) denticulate spines on outer margin, the apical ones doubled. Metatibia with 3–4 dental spines on outer margin. Meso- and metatibial apical corner a little elongate, usually with two spines. Ventral surface of profemur alutaceous. Male genital structures as figured ( Figs. 11–12 ).

Etymology. The species is dedicated of my friend and colleague Alex Korshunov , who found the first specimen of this species.

Distribution. The species is known only from Thailand and has been collected in May and December.

Figures

FIGURES 7 – 12. Nicotikis korshunov i Zinchenko sp. n. (7, 9 – 12 — holotype; 8 — paratype). 7 — dorsal view; 8 — ventral view; 9 — pygidium; 10 — antenna; 11 — male genitalia, ventral view; 12 — same, lateral view.