Spilomicrus metopotrypus, Chemyreva, 2018

Chemyreva, V. G., 2018, The Eastern Palaearctic parasitic wasps of the genus Spilomicrus Westwood, 1832 (Hymenoptera: Diapriidae), Far Eastern Entomologist 357, pp. 1-20 : 9-12

Spilomicrus metopotrypus Сhemyreva, sp. n.

Figs 17–25

TYPE MATERIAL. Holotype – ♀, Russia: Primorskiy Terr., 30 km NW from

Spassk-Dalniy, 24–25.VIII 1981, S. Belokobylskij ( ZISP). Paratypes. Russia :

Primorskiy Terr.: Lazo Nature Reserve, 18 km SE Lasorevskiy, 25–26.VIII 2006,

1♀, SB ( ZISP); Anisimovka , 29.VIII 2001 , 1♀, SB ( ZISP); vicinity of SpasskDalniy , 19–23.VIII 1987 , 1♂, SB ( ZISP). Japan: Hokkaido, 40 km S Sapporo ,

Shikotsuko Lake, 4.IX 1999, 1♀, SB ( ZISP). South Korea: Mt. Sudo , 500 m ,

36˚50′N, 125˚00′E, 16‒19.IX 1989, 1♀, K. Yamagishi ( CNCI).

Figs 17–25. Spilomicrus metopotrypus sp. n. 22‒24 – male; 17‒21, 25 ‒ female; 17 –

mesosoma, dorsal view; 18 – habitus, lateral view; 19 – face; 20 – frons; 21 – head, dorsal view; 22 – antennae; 23 – mesosoma and petiole, dorsal view; 24 – A1‒A5 of male; 25 –

female antennae. Scale bar: 18 ‒ 1.0 mm; 22, 23, 25 – 500 μm; 17, 19‒21, 24 – 200 μm.

DESCRIPTION. Female (holotype). Body length 3.3 mm. Fore wing length 3.0

mm. Antenna length 1.7 mm. Colour. Body mainly black; legs, venation, tegula,

anterior part of A1 and A2–A8 amber; teeth of mandible, posterior parts of A1 and antennal segments A9–A13 dark brown; palpi yellow.

Head in dorsal view transverse (35:30) and narrower than mesosoma (35:42), in lateral view higher than length (35:30). Head smooth and shine covered with scattered setigerous punctures and long setae. Tentorial pit absent. Malar sulcus absent (Fig.

19). Clypeus convex, semicircular, small, transverse (9:6). Mandibles weakly overlapping, bidentate: upper tooth shorter than lower. Ratio of eye height to head height (16:30), oval (16:12), with a few long setae; malar space shorter than eye height (7:16). Ratio of pleurostoma distance to width of head 20:31. Front above toruli with two deep pits (Fig. 20).Ocelli oval, LOL weakly longer than width of front ocellus (Fig. 21). POL shorter than OOL (5:7). Occipital flange narrow without sculpture. Postgenal cushion dense.

Antenna with non-abrupt clava (Fig. 25). Scape cylindrical, curved, broadened anteriorly, covered with fine coriaceous sculpture and numerous long setae. Apical rim of A1 with two small indistinct lamellae. A2 compressed, in lateral view tapering at base. A8–A13 distinctly flattened on ventral side with MGS brush. In lateral view, connection between A6–A13 situated dorsaly. A13 with ventral pit. Ratios of length to width of A1–A 13 in dorsal view: A1 35:9; A2 10:7; A3 12:6; A4 9:6.5; A5

9:7; A6 9:8; A7 9:8.5; A8 9:10; A9 10:11; A10 9:11; A11 9:11; A12 9:10; A13 10.5:8.

Mesosoma in lateral view longer than high (55:33); in dorsal view, longer than wide (55:38). Neck bare, with deep longitudinal grooves. Cervical pronotal area pubescent; pronotal cushion dense. Lateral area of pronotum smooth. Propleuron covered with short dense pubescence. Mesopleuron smooth, shining and bare laterally, with one longitudinal groove under tegula and without sternaulus. Ventral side of mesopleuron smooth and setose. Anterior incision of mesopleuron pubescent.

Acetabular carina sharp, strongly prominent and dislocated posteriorly in medial part; not disturbed medially. Postacetabular sulcus absent. Mesodiscriment moderately deep. Mesopleural epicoxal carina developed only laterally; mesopleural epicoxal sulcus and carina on ventral side absent. Mesoscutum convex wider than length (33:25). Notauli absent. Humeral sulcus narrow and shallow anteriorly.

Mesoscutum, axilla and scutellum with a few scattered setigerous punctures and setae, smooth and shine. Scutellum flattened with two large circular anterior scutellar pits. Axillar depression pubescent and smooth. Lateral scutellar pits large,

broad and long. Four posterior scutellar pits large not deep. Dorsellum pubescent with coarse sculptured; median and one lateral keels of dorsellum weakly projecting. Propodeum narrowed posteriorly, transverse (21: 13). Median propodeal keel projecting into high not sharp spine directed upwards (Fig. 18); entire propodeum coarse rugose, with pale pilosity and several longitudinal irregularly keels. Posterior margin of propodeum in dorsal view weakly arcuate (Fig. 23). All legs slender with trochantelli.

Fore wings clear. Marginal vein elongated (7:3); stigmal vein weakly longer than width of marginal. Submarginal vein and costa tubular, sclerotized. Basal vein nebulous. Ratio largest width to length of fore wing 15:35.

Metasoma. Petiole cylindrical, elongated (16:10), with irregular longitudinal keels and long setose on ventral and lateral sides, dorsal side bare. T2 with short sparse setae without micropunctures. T3–T5 bare with a few long setae. T5 expanded laterally. T6 small, T7 pointed, with a few setigerous punctures. S2 smooth with dense pale cushion at anterior margin; its posteriot surface with scattered setae.

S3‒S5 with dense punctuation and one row of long setae. Apical sternite with dense punctation and long setae apically.

VARIATION. Body length 2.6–3.3 mm. Head equal or wider than mesosoma.

Petiole 0.28–0.40 as long as mesosoma toruli with two deep pits Front above toruli with two deep rounded pits divided with a keel to only the keel developed and pits absent. A5 subquadrate to weakly elongated.

MALE. Body length 2.7 mm. Similar to female, but differs mainly in antennal structures and metasoma proportions. Antenna reddish brown; A1 and A2 covered with sparse setae and very fine coriaceous sculpture; flagellum with dense short setae (Fig. 22). A4 not excavated with straight keel extanding from base to 0.8 of its length (Fig. 24). Ratios of length to width of A1–A 13 in dorsal view: A1 20:4.5; A2

6:4; A3 18:5; A4 12:4.5; A5 9:4; A6 9:4; A7 8:4; A8 8:4; A9 8:4; A10 8:4; A11

8:3.5; A12 8:3.5; A13 11:3. T5 not expanded laterally. Acetabular carina disturbed medially; mesodiscriment very deep (perhaps, it is result of damage). S3–S7 with fine microsculptured medially.

DIAGNOSIS. The species is closely related to S. tentorialis sp. n. but differ from it by following characters: tentorial pits absent (large in S. tentorialis ); apical rim of female scape with very small indistinct lamella (lamella large in S. tentorialis );

male A3 distinctly longer than A4 (A3 and A4 ubequal in S. tentorialis ); T2 without setae protrude from under its (the setae present in S. tentorialis ).

DISTRIBUTION. Russia (Primorskiy Terr.), Japan (Hokkaido), South Korea.

ETYMOLOGY. Derived from Greek m é topo (forehead) and trýpa (hole).