Spilomicrus transversus 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 : 15-19

Spilomicrus transversus Chemyreva , sp. n.

Figs 34‒40

TYPE MATERIAL. Holotype – ♀, Russia: Primorskiy Terr., Anisimovka ,

mountain Krinichnaya, 28.VIII 2001, S. Belokobylskij ( ZISP). Paratypes. Russia :

Primorskiy Terr.: same label as in holotype, 1♀, 1♂ ( ZISP); Lazo Reserve , 5-10.VII

2014, 7♂, 2♀, V. Chemyreva ( ZISP, BMNH); Ussuriysk Distr., 20 km SW Krounovka ,

4–5.VIII 1993, 2♂, SB ( ZISP); Spassk-Dalniy outskirts, Evseevka, 20–22.IX 1987,

1♀, SB ( ZISP); Sikhote-Alin’ Nature Reserve, Udachnaya Bay, 6–11.VIII 2012,

1♀, V . Loktionov ( ZISP); Southern Primorije , 1992 , 1♂, 4♀, A. Okulov ( CNCI) .

Japan: Hokkaido Island, Sapporo , 13.VIII 1987, 1♀, K. Maeto ( CNCI). Honshu

35 – habitus, lateral view; 36 – head, dorsal view; 37, 38 – antenna, lateral view; 39 – mesosoma, dorsal view; 40 – mesosoma and petiole, dorsal view. Scale bar: 35 ‒ 1.0 mm; 37, 38 –

500 μm; 34, 36, 39, 40 – 200 μm.

Island, Aichi Pref., Mt. Sanage-yama , 4–10. VI 1989, 1♂, A. Takano ( CNCI) .

Shikoku Island, Ehime Pref., Ishizuchi, N.P.Omogo Valley, 700 m, 21.IX 1980, 1♀,

S. Peck ( CNCI).

DESCRIPTION. Female (holotype). Body length 2.4 mm; fore wing length 2.1

mm; antenna length 1.4 mm. Colour. Body mainly black; tegulae, legs, palpi and

A13 yellowish brown; venation brown; A2–A12 dark brown.

Head in dorsal view as wide as long, narrower than mesosoma (21:24); in lateral view as high as long. Head covered with scattered setigerous punctures. Tentorial pits present, large, with weakly defined edge ( Fig. 34 ). Malar sulcus absent. Clypeus smooth and shining, strongly transverse (35:15), convex. Epistomal sulcus distinct and deep. Mandible long, bidentate, upper tooth shorter and narrower than lower tooth. Eye with long sparse pubescence, not enlarged, shorter than half of head height (13:15), oval (13:10). Malar space shorter than the longest diameter of eye

(10:16). Pleurostomal distance 0.75 times as long as width of head. Vertex gradually sloping behind ocelli. Ocelli medium-sized, oval (12:9), LOL larger than width of anterior ocellus (5:4) ( Fig. 36 ). POL 0.5 times OOL. Occipital flange narrow,

smooth. Postgenal areas with cushion of setae.

Antenna with non-abrupt clava ( Fig. 37 ). A1 cylindrical, slightly arcuate,

broadened apically, covered with sculpture and scattered long setae. Apical rim of

A1 with two moderately projecting lamellae. A2 rounded in apical part and compressed at base, rectangular in lateral view (5:6). A2–A13 covered with dense short and long setae. Clavomeres A9–A12 flattened on ventral side with distinct MGS

brush. In lateral view, articulation points between A8–A13 slightly displaced dorsally ( Fig. 35 ). A13 without ventral pit. Ratios of length to width of A1–A 13 in dorsal view: A1 23:6.5; A2 7:4.5; A3 6:5; A4 4:5; A5 4:5; A6 4:5; A7 4.5:5.5; A8

5:6; A9 6:6.5; A10 6:7.5; A11 6:7.5; A12 6:7; A13 7:5.

Mesosoma depressed, in lateral view longer than high (39:20), in dorsal view longer than wide (39:25). Neck bare, with longitudinal grooves posteriorly, fine rugose anteriorly ( Figs 36, 39 ). Median pronotal area narrow, perpendicular to mesoscutum, with few setae medially and dense setae laterally. Pronotal shoulders weakly convex and rounded. Lateral pronotal area smooth and bare. Propleuron smooth, with dense and short pilosity ( Fig. 34 ). Mesopleuron smooth, with two narrow longitudinal keels under tegula, shining and bare at median area. Sternaulus absent. Anterior incision of mesopleuron distinct, without setae. Acetabular carina strongly prominent laterally and somewhat flattened and medially not moved anteriad or posteriad. Ventral side of mesopleuron pubescent. Postacetabular sulcus absent. Mesodiscrimen distinct. Mesopleural epicoxal carina present only laterally;

mesopleural epicoxal sulcus and carina on ventral side absent. Mesoscutum flattened,

wider than long (25:20), with few separate setigerous punctures and long setae,

shine ( Fig. 39 ). Notauli distinct, developed only in posterior third of mesoscutum,

well impressed, convergent posteriorly. Humeral sulcus indistinct. Anterior scutellar pits small, convergent anteriorly and diverging in posterior part. Axilla smooth and shine, with scattered setigerous punctures and long setae. Axillar depression pubescent and smooth. Lateral scutellar pits distinct, broad. Posterior scutellar pits very large. Metascutellum and propodeum coarsely rugose and entirely with numerous erect setae ( Fig. 40 ). Median and laterals keels of metascutellum weakly projecting. Propodeum strongly transverse (45:18); median propodeal keel moderately projecting anteriorly and directed upwards.

Wings. Marginal vein elongate (8:3); stigmal vein longer than width of marginal vein (4:3). Submarginal vein tubular, sclerotized. Costa nebulous distally and sclerotized at base. Basal and cubital veins nebulous. In fore wing ratio of length to width 7:18.

Metasoma. Petiole cylindrical, in dorsal view longer than median width (8:5),

with fine longitudinal grooves anteriorly ( Fig. 40 ). Petiole entirely covered with short and long setae ventrally and laterally, and dorsally in anterior half. Metasoma behind petiole rounded, elongate (21:12). Posterior part of T 2, T 3– T 6 and S3–S5

medially with traces of microsculpture and covered with long erect and scattered setae. T 5 not expanded laterally, without additional short setae. T 7 with few setigerous punctures and setae. S2 with dense cushion of setae at base, remaining surface of S2 with scattered long setae. S6 with dense setigerous punctures and numerous long erect setae.

VARIATION. Body length 2.4–3.2 mm. A1–A13 dark brown to reddish brown;

legs yellowish to reddish brown. A3 shorter to distinctly longer than A2. Trochantelli of middle femora indistinct or partly marked. Costal vein sclerotized in various length. Mesopleuron with two or three keels under tegula. Posterior scutellar pits of variable size and number. Median keel of propodeum strongly to weakly expressed.

Petiole cylindrical or broadened medially, covered with long keels entirely or in anterior parts only.

MALE. Body length 2.3–3.3 mm. Similar to female, but differs mainly in antennal structures and metasoma proportions. A3–A13 reddish brown, covered with short dense pale pilosity, A1 and A2 amber yellow to dark brown, with long sparse setae and coriaceous sculpture ( Fig. 38 ). A4 emarginate below, with keel extended from base to 0.65–0.70 of segment length. Keel surrounded by bare and shine areas. Ratios of length to width of A1–A 13 in dorsal view: A1 25:6; A2 7:5;

A3 13:5.5; A4 11:6; A5 9:6; A6 9:6; A7 9:6; A8 9:6; A9 9:6; A10 9:5.5; A11 8:5.5;

A12 8:5.5; A13 11:5. Notauli short, developed in posterior third to posterior half of mesonotum. Petiole elongate (20:11), 0.26–0.33 as long as mesosoma. T 5 not expanded laterally.

DIAGNOSIS. Spilomicrus transversus sp. n. can be differentiated from other

Palaearctic species by the combination of these states: clypeus strongly transverse,

more than two times wider than high ( Fig. 34 ); pleurostomal distance much greater than half of head width; propodeum, especially in female, transverse, posterior margin strongly emarginate between plicae ( Fig. 40 ); all legs in female stout: femora shortened, widest at its basal third and with sharp ventral margin ( Fig. 35 ); mesosoma of female depressed, distinctly wider than high; trochantelli marked in fore and mid femora, hind femur with unmarked trochantelli. The species is closely related to S.

compressus, but differs from them by the following combination of characters: female petiole more elongate, in dorsal view longer than median width (8:5) (wider in S.

compressus (9:8)); head distinctly transverse (subquadrate in S. compressus); median propodeal keel elevated (flattened in S. compressus); A4–A12 of female strongly transverse (at least A4–A9 weakly transverse in S. compressus); antenna with nonabrupt clava (abrupt in S. compressus).

DISTRIBUTION. Russia (Primorskiy Terr.), Japan (Hokkaido, Honshu,

Shikoku).

ETYMOLOGY. The name derived from the Latin adjective transversus and refers to transverse clypeus, propodeum and female antennomeres.

Figures

Figs 34–40. Spilomicrus transversus sp. n. 34‒37, 39, 40 – female; 38 – male; 34 ‒ face;