Margaiostus sundukovi, Prosvirov, Alexander S., 2015

Prosvirov, Alexander S., 2015, Margaiostus sundukovi sp. nov., the first record of the genus in the Palaearctic region (Coleoptera: Elateridae), Zootaxa 3980 (3), pp. 442-446 : 443-445

Margaiostus sundukovi sp. nov.

( Figs. 1, 2 , 4–6 )

Type locality. Russia: Primorsky Province, Lazovsky district, Lazovsky State Nature Reserve.

Type material. Holotype, male, Russia: “Приморский край, Лазовский заповедник, кордон Корпадь, 43°15'17'' N, 134°07'59'' E, 19–20.V.2007, С. Холин leg.” [Primorsky Province, Lazovsky State Nature Reserve, Korpad’ guarding point, 43°15'17'' N, 134°07'59'' E, 19–20 May 2007, S.K. Kholin leg.] ( ZISP). Paratypes, 2 males, 8 females, Russia: 1 male, same data as holotype, “С. Холин leg.” [S.K Kholin leg.] (CPM); 1 female, “Приморский край, Лазовский заповедник, кордон Америка, 43°16'16'' N, 134°03'01'' E, 24.VI.2005, Ю. Сундуков, В. Шохрин leg. [Primorsky Province, Lazovsky State Nature Reserve, Amerika guarding point, 43°16'16'' N, 134°03'01'' E, 24 June 2005, Yu.N. Sundukov, V.P. Shokhrin leg.] ( ZISP); 1 female, same data, but 18–19 July 2006, “С. Холин leg.” [S.K. Kholin leg.] (CPM); 1 female, same data, but 19–20 July 2006, “Ю.Н. Сундуков leg.” [Yu.N. Sundukov leg.] (CPM); 1 female, same data, but 25–28 August 2006 “Ю.Н. Сундуков leg.” [Yu.N. Sundukov leg.] ( ZISP); 1 female, “Приморский край, Лазовский заповедник, ур. Америка, 18– 19.VI.2005, С. Холин leg.” [Primorsky Province, Lazovsky State Nature Reserve, Amerika landscape unit, 18–19 June 2005, S.K. Kholin leg.], ( ZMMU); 1 female, “Приморский край, Лазовский заповедник, б. Проселочная, 4–9.VI.2005, Ю. Сундуков, Л. Сундукова leg.” [Primorsky Province, Lazovsky State Nature Reserve, Proselochnaya Bay, 4–9 June 2005, Yu.N. Sundukov, L.A. Sundukova leg.] ( ZMMU); 1 female, “Приморский край, Лазовский зап-к, Сухой Ключ, дубрава на склоне, 25.VI.1981, Т.И. Олигер leg.” [Primorsky Province, Lazovsky State Nature Reserve, Sukhoy Klyuch spring, oak forest on slope, 25 June 1981, T.I. Oliger leg.] ( ZISP); 1 female, “Приморский край, Лазовский район, около 18 км СВ пос. Лазо, верховья р. Пасечная, правый берег ручья Лукьянов Лог, на злаке, h~600–800 м, N 43º29'40", E 134º04'15", 7.VIII.2011, А.С. Просвиров leg.” [Primorsky Province, Lazovsky District, ca. 18 km NE Lazo village, upper reaches of Pasechnaya river, right bank of Lukyanov Log stream, on a grass, h~ 600–800 m, N 43º29'40", E 134º04'15", 7 August 2011, A.S. Prosvirov leg.] (CPM); 1 male, “Южн. Приморье, Каменушка, бл. Уссурийска, 13–15.VI.1979, Михеечев, Никитский leg.” [Primorsky Province, Kamenushka village, near Ussuriysk city, 13–15 June 1979, A.V. Mikheetshev, N.B. Nikitsky leg.] ( ZMMU).

Diagnosis. M. sundukovi sp. nov. is closely related to M. grandicollis (LeConte, 1863) , the type species of the genus, but can easily be distinguished by the flatter and more densely pubescent body, by the presence of the distinct smooth line in the middle of the pronotum, by the more densely punctuate dorsum, by the dull or only slightly shining intervals on the hypomera and by the smaller and sparser punctures on the underside.

Description. Male: Length: 7.0– 7.9 mm (holotype 7.8 mm); width: 2.4–2.7 mm (holotype 2.7 mm). Body flattened, oblong. Dorsum chestnut brown, shining; anterior part of head, base and hind angles of pronotum, anterior slope of elytra and scutellum usually slightly lighter (anterior edge of scutellum darker than rest of scutellum); covered with bronze, moderately dense, long, recumbent setae. Underside varies from chestnut brown to reddish-brown, beaded part of prosternal lobe usually darker; covered with yellowish-grey, dense, long, recumbent setae; pubescence along median part of prosternum less dense than on other part of body. Antennae, legs and mouthparts (except chestnut brown apices of mandibles) reddish-brown.

Head. Depressed, distinctly transverse (ratio length/width varies from 0.65 to 0.72), anterior margin of frons strongly depressed medially, so thus clypeal area sharply narrowed in center. Punctures coarse and slightly larger than on pronotum, umbilicate, intervals between punctures subequal to diameter of puncture or slightly smaller. Antennae almost reaching bases of hind angles of pronotum (not reaching apices of hind angles by approximately 2–2.5 length of last few antennomeres), slightly serrate beginning with antennomere 4. Antennomere 1 broadened, clearly flattened; 2nd and 3rd antennomeres elongate, about two times as long as wide, slightly expanded to apex, 3rd slightly longer than 2nd; 4th about as long as 3rd, more clearly expanded to apex; subsequent antennomeres about as long as 4th, a little more expanded to apex; last antennomere ovate oblong. Apical segment of maxillary palpus expanded at base forming right-angled triangle.

Thorax. Pronotum more than twice as wide as head, slightly wider than long (length: 2.1–2.3 mm; width: 2.2– 2.6 mm), widest near middle, narrowed toward anterior angles more sharply than toward hind angles, slightly sinuate in front of hind angles. Hind angles of pronotum rather thin and long, clearly divergent; carina distinct, short and not reaching posterior third of pronotum. Disc of pronotum slightly convex, at posterior third with clearly visible middle impression, along midline with distinct smooth line. Punctures rather dense and gently elongate laterally; intervals between punctures equal to diameter of puncture or slightly smaller; on disc punctures sparser, circular, intervals between punctures usually noticeably larger than diameter of puncture, smaller along the anterior margin. Pubescence of pronotum directed caudad at lateral sides and medio-caudad on disc. Punctures of hypomera very dense, circular, consisting of mixed, shallow small ones and considerably larger, deep ones; intervals between punctures dull or slightly shiny. Prosternum as well as hypomera punctate, but punctures less dense, intervals between punctures shining. Prosternal lobe arcuate in front, separated from rest of prosternum by obsolete transverse impression and coarsely punctured by homogeneous large punctures. Prosternal process flat, widely bordered at sides; carina clearly surpassing beyond other surface. Mesosternum and metasternum as well as prosternum punctate. Hind coxal plates widened inwards. Scutellum flat, oblong oval, longer than wide, truncated at anterior margin. Elytra ellipsoidal, slightly wider than pronotum, widest near middle, about twice as long as pronotum (length: 4.2–4.7 mm; width: 2.4–2.7 mm); tapering more strongly to apex than to base; shoulders obtusely rounded. Disc of elytra slightly convex, elytral striae with fine circular punctures; intervals flat, with fine, sparse punctures. Wings normally developed.

Abdomen. Abdomen as well as metasternum punctate. Ratio of length of abdominal sternite 2 and length of metasternum 0.4.

Aedeagus. ( Fig. 4 ). Typical, trilobate. Parameres about as long as penis, almost straight, specifically expanded in anterior quarter. Penis slender, narrow, its apophyses very short, about 0.25 times as long as penis.

Female. Usually slightly darker than male. Notably larger than male (length: 9.3–10.3 mm; width: 3.1–3.6 mm); body more convex. Pronotum slightly wider than long (length: 2.7–2.9 mm; width: 2.9–3.1 mm); widest near middle or behind it. Antennae shorter than in males, reaching short of hind angles of pronotum by as much as length of last 3–3.5 antennomeres. Elytra longer and wider than in males (length: 5.6–6.4 mm; width: 3.1–3.6 mm). In all other respects, females similar to males.

Female genital tract. ( Figs. 5, 6 ). Typical scelorotised cordiform plate, consisting of conjoined spines, situated at bursa copulatrix.

Larva. Unknown.

Variability. Size, body proportions and coloration somewhat variable.

Etymology. Named in honour of the collector of the type series and my friend, the distinguished Russian entomologist Dr. Yuriy N. Sundukov.

Distribution. Russia: Primorsky Province.

Remarks. The biology of this species remains unknown, but one female was collected on a grass near a forest stream. It is possible that M. sundukovi sp. nov., as well as the other species of the genus, inhabits forest biotopes.

Additional material. ( Fig. 3 ). Margaiostus grandicollis (LeConte, 1863) , 1 ♀, Canada: “P.–Au-Saumon (Char. E), Que., 5.VI.1995, Y. Bousquet leg.”

Figures

FIGURES 1 – 3. HabItus of Margaiostus specIes, dorsal vIew. 1. M. sundukovi sp. nov., male, holotype (7.8 mm). 2. M. sundukovi sp. nov., female paratype (9.8 mm). 3. M. grandicollis, female (8.7 mm). Not to scale.

FIGURES 4 – 6. GenItalIa of Margaiostus sundukovi sp. nov. 4. Aedeagus, ventral vIew. 5. Female genItal tract, general vIew. 6. CordIform plate In bursa copulatrIx. Not to scale.