Spilomicrus tentorialis 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 : 12-15

Spilomicrus tentorialis Chemyreva , sp. n.

Figs 26‒33

TYPE MATERIAL. Holotype – ♀, Russia: Primorskiy Terr., 25 km SW from

Spassk-Dalniy, Evseevka, 23.VII 2013, S. Belokobylskij” ( ZISP). Paratypes.

Russia: Primorskiy Terr.: 25 km SW from Spassk–Dalniy, Evseevka , 23.VII 2013 ,

3♀, 2♂, SB ( ZISP, BMNH); 15 km SSE of Nezhino , 16–18.VII 1993 , 1♀, 1♂, SB

( ZISP); 5 km E from Chernigovka, Gornyy Khutor, 2.VII 1993, 1♂, SB ( ZISP) ;

vicinity of Spassk-Dalniy, 12.VII–7.VIII 1993, 2♂, SB ( ZISP); Lazo Nature

Reserve, 22–24.VII 1993, 1♂, SB ( ZISP); same locality, VII 2007, 1♀, K. Makarov

( ZISP). Japan: Honshu Island: Iwate Pref., Iwaizumi, Hitsutori , 770 m, 11–17.VIII

1991, 3♀, A. Smetana ( CNCI); Aichi Pref., Shitara, Ubarani, 900 m, 23. V –3.VII

1994, 11–17.VII 1994, 18–24.VII 1994, 10♀, 4♂, K. Yamagishi, ( CNCI); Aomori

Pref., Towadako, Yakeyama nr. Tsuta riv. 250 m, 40ᵒ35′N, 140ᵒ59′E, 22–23.VIII

1996, 1♀, L. Masner ( CNCI). Shikoku Island: Ehime Pref., Ishizuchi Mt. National

Park, Omogo Valley, 700 m, 20.VIII 1980, 1♀, S. Peck ( CNCI); Ehime Pref.,

Ishizuchi Mt. National Park, Tsuchigoya 1400 m, 11‒18.VIII 1980, 1♂, S. & J. Pek

DESCRIPTION. Female (holotype). Body length – 3.4 mm. Fore wing length

3.2 mm. Antenna length 2.4 mm. Body mainly black; tegulae, legs, mandibulae and

A1–A6 reddish brown; palpi yellow.

Figs 26–33. Spilomicrus tentorialis sp. n. 26‒29, 31, 33 – female; 30, 32 – male; 26 –

face; 27 – habitus, lateral view; 28 – head, dorsal view; 29 – antennae, lateral view; 30 –

A1‒A6 of male; 31 – mesosoma, dorsal view; 32 – antenna; 33 – mesosoma and petiole,

dorsal view. Scale bar: 27 ‒ 1.0 mm; 29, 30, 32, 33 – 500 μm; 26, 28, 31 – 200 μm.

Head in dorsal view transverse (26:21), narrower than mesosoma (26:28), in lateral view higher than length (25:21). Temples and vertex, frons, face and cheek covered by sparse setigerous punctuation, which denser on face (Figs 26, 28).

Tentorial pits distinct. Malar sulcus absent. Clypeus semicircular, transverse (9:7),

convex. Mandibles projecting forwards, overlapping and bidentate: upper tooth shorter than lower. Eye twice shorter than high of head, oval (12:10), with a few short setae; malar space shorter than eye height (7:12). Pleurostomal distance 2.2

times shorter than wide of head. Front at base toruli smooth. Ocelli oval, triangle,

LOL weakly longer than width of anterior ocellus (Fig. 28). POL much shorter than

OOL (6:13). Occipital flange narrow smooth. Postgena with dense cushion (Fig. 31).

Antennae. A1 cylindrical, slightly curved and sparsely covered by fine setigerous punctuation with long setae. Apical rim of A1 with two projecting lamellae overlapping base of A2. A2 compressed, in lateral view quadrate. Antenna with non-abrupt clava (Fig. 29). A8–A13 distinctly flattened on ventral side with MGS brush. In lateral view, connection between A6–A13 situated dorsaly. A13 without ventral pit.

Ratios of length to width of A1–A 13 in dorsal view: A1 24:5.5; A2 5:4; A3 7:4; A4

6:4.5; A5 5:4.5; A6 6:5; A7 6:5.5; A8 7:7; A9 7:7.5; A10 7:7.5; A11 7:7.5; A12

7:7; A13 8:6.

Mesosoma in lateral view longer than high (33:20); in dorsal view longer than wide (33:24). Neck bare, with deep longitudinal grooves. Cervical pronotal area pubescent; pronotal cushion dense (Fig. 28). Pronotum with sparse setigerous points dorsally near mesonotum. Lateral pronotal area smooth. Anterior incision of mesopleuron small and deep. Propleuron smooth, covered with short silvery pubescence. Mesopleuron with smooth and pubescent ventral side, smooth and bare lateraly, with one longitudinal keel under tegula and sternaulus extending from anterior incision of mesopleuron to posterior margin of mesopleuron as sharp keel.

Acetabular carina sharp, strongly prominent and moved posteriorly in medial part;

not disturbed medially. Postacetabular sulcus absent. Mesodiscriment deep.

Mesopleural epicoxal carina developed only laterally; mesopleural epicoxal sulcus and carina on ventral side absent. Mesoscutum wider than length (28:22). Notauli absent. Humeral sulcus partly shallow anteriorly. Mesoscutum, axilla and scutellum with scattered setigerous punctuation. Scutellum flattened with two large circular anterior scutellar pits. Axillar depression poorly pubescent and faintly sculptured

(Fig. 33). Lateral scutellar pit broad and long. Posterior scutellar pits small and deep. Metascutellum pubescent with deep punctuation; median and one lateral keels weakly projecting. Propodeum narrowed posteriorly, transverse (45:25); median propodeal keel projecting into spine directed upward; propodeum entirely coarsely rugose, with pale pilosity and several longitudinal irregular keels. Posterior margin of propodeum in dorsal view weakly arcuate. All legs with delimited trochantelli.

Fore wings clear, three times longer than wide. Marginal vein elongate (5:3);

stigmal vein longer than width of marginal vein (Fig. 27). Submarginal vein tubular, sclerotized. Costa and basal vein nebulous.

Metasoma. Petiole cylindrical, weakly broadened posteriorly, elongated (11: 9),

with longitudinal grooves which deep anteriorly and shallow posteriorly, entirely pubescent excluding area near base of T 2. Several long setae protrude forward from under anterior margin of A2 (Fig. 33). T 2 with a few short sparse setae without micropunctures. T 3– T 5 each with dense fine punctation and one row setigerous punctures with long setae, the setae becoming denser on lateral part of tergites. T 5

expanded lateraly and covered with numerous short and long setae at sides. T 6

small, T 7 pointed. S2 smooth, with dense white cushion at anterior margin; its posterior surface with scattered setae. S3‒S5 with dense fine micropunctures and one row of long setae. Apical sternite with denser punctation and short setae apically.

VARIATION. Body length 2.6–3.4 mm. A3 equal to slightly longer than A2.

A8–A11 subquadrate to weakly transverse. Front at base toruli smooth or with very shallow pressure. Petiole 0.25–0.30 as long as mesosoma.

MALE. Body length 2.8–3.7 mm. Similar to female, but differs mainly in antennal structures and some proportions. Eyes of male larger, ratio of its high and head high 17:32. A3‒A13 dark brown covered with short and dense pale pubescence, A1

and A2 amber, smooth, with long sparse setae. A4 weakly excavated, with keel extending from base to 0.8–0.9 segment length (Figs 30, 32). Length to width of

A1–A 13 in dorsal view: A1 20:4.5; A2 5:4; A3 15:4; A4 15:5; A5 10.5:4.5; A6

11:4.5; A7 12:4.5; A8 12:4.5; A9 12:4.5; A10 12:4.5; A11 11:4; A12 11:4; A13 14:3,

but sometimes A3 much more shorted. A3 as long as A4 or longer than it. Petiole elongated (6:21), 0.30–0.35 as long as mesosoma. T 5 not expanded lateraly and without setae at sides.

DIAGNOSIS. S. tentorialis sp. n. can be differentiated from the all known

Spilomicrus species by the combination of these states: tentorial pits large; malar sulcus and notauli absent (Figs 26, 31); female antennae with non‒abrupt clava,

apex of A13 pale; male A4 weakly excavated, with keel extending from base to

0.8‒0.9 segment length; distal margin of propodeum in dorsal view weakly arcuate;

long setae protrude forward from under T 2 anterior margin (Fig. 33). The species is closely related to S. integer Thomson, from European fauna, but differs from it by following characters: head of male and female strongly transverse in dorsal view

(subquadtare in S. integer); marginal vein short, no longer than its width (elongate in S. integer). In the East Palaearctic fauna the new species is most similar to S.

bicarinatus sp. n. but differs by several states: male A5 without keel (with keel in S.

bicarinatus); body length 2.6–3.7 mm (1.3–2.9 mm in S. bicarinatus ); female with non-abrupt clava (abrupt 6-segmented clava in S. bicarinatus )

DISTRIBUTION. Russia (Primorsky Terr.), Japan (Honshu, Shikoku).

ETYMOLOGY. The name refers to the big and well observed tentorial pits.