Nicotikis kabakovi Zinchenko

Zinchenko, Vadim, 2014, Review of species of the genus Nicotikis Marseul, 1883 (Coleoptera: Histeridae) from Southeast Asia, Zootaxa 3860 (5), pp. 487-492 : 488

Nicotikis kabakovi Zinchenko sp. n.

( Figs. 1–6 )

Type material. Holotype (male): length: PEL: 3.3 mm, the total length 4.35 mm. Width: EW: 2.2 mm. With two labels, as follows: 1. White, printed: “ 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, 2.06.2010[.] V.K. Zinchenko leg.” 2. Red, printed: “ HOLOTYPE Nicotikis kabakovi V. Zinchenko det. 2013” ( ISEA). Paratypes: 6 specimens, labeled as holotype: 1♂, 1♀, 30.05.2010; 1♂, 1$, 1.06.2010; 1♂, 1♀, 2.06.2010 ( ISEA). 1♂, “D.R. Vietnam [,] Bai- Tuong[Baithuong,] ~ 300 m. O. Kabakov [.] 27xii [1]964” ( ZISP).

Diagnosis. Nicotikis kabakovi closely resembles N. lackneri and N. korshunovi , but differs from these species in the following characters: fifth elytral stria confined to the basal part of elytra, stria four longer and slightly shorter than or equal to the sutural stria. From N. korshunovi the new species also differs in the shape of antennal club and aedeagus.

Description. Length of body: PEL: 3.2–3.6 mm, the total length 3.5–4.5 mm. Width: EW: 2.1–2.3 mm. Body ( Fig. 1 ) oblong, slightly convex medially black, shiny. Antennae and legs dark reddish-brown. Antennal club tomentose, with V-shaped sutures, basal suture widely interrupted medially ( Fig. 4 ). Ratio of width of pronotum to head about 2.56–2.85. 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 punctuate distributed by 0.5–2.0 times their diameter. Pronotal sides weakly arcuate and convergent on basal 2/3, 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 prolonged along the pronotal base on about 1/8–1/6 of its length. Pronotal disc sparsely covered with fine ground puncturation, almost smooth at middle. Epipleura tristriate in addition to the 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 in 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 2/5 to 1/2, the fifth on apical 2/5 to 3/5. Sutural stria present in apical half, its apical portion shortened in 1/7–1/5, reaching almost to mid-length of elytra. All the dorsal striae crenate apically. Propygidium ( Fig. 3 ) 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 ( Fig. 2 ) 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 weak 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 and replaced here by a median mesosternal stria composed of two parts ( Fig. 2 ). 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 one of them abbreviated basally. Protibia with 5 spiny denticles on outer margin and a pair of spines at inner angle. Mesotibia with 4, rarely 5 dental spines on outer margin, the apical ones doubled. Metatibia with 3–4 denticulate 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. 5–6 ).

Etymology. The species is dedicated the memory of Oleg Kabakov , the well-known coleopterist, who made a great contribution to the study of the fauna of Indochina.

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

Figures

FIGURES 1 – 6. Nicotikis kabakov i Zinchenko sp. n. (holotype). 1 — dorsal view; 2 — ventral view; 3 — pygidium; 4 — antenna; 5 — male genitalia, ventral view; 6 — same, lateral view.