Acanosema (Cardiopsilus) epicnemium Chemyreva et Kolyada, 2021

Chemyreva, V. G. & Kolyada, V. A., 2021, Review of the subtribe Psilommina (Hymenoptera: Diapriidae, Belythinae) from Russian fauna, Far Eastern Entomologist 436, pp. 1-34 : 14-16

Acanosema (Cardiopsilus) epicnemium Chemyreva et Kolyada , sp. n.

http://zoobank.org/NomenclaturalActs/ DAD77850-9C5B-47DD-B414-EC8A9A32C8C8

Figs 33–39

TYPE MATERIAL. Holotype – ♀, Russia: Primorsky krai, Suputinskiy zapo-

vednik [Ussuriysky Nature Reserve], 1.VIII 1961 O. Kovalev ( ZISP). Paratypes –

Russia: Primorsky krai: Ussuriysky Nature Reaserve , 26–30.VII 1972, 1 ♂ , M.

Kozlov; 10 km SE of Ussuriysk, 12–19.VII 2001, 2 ♂, S. Belokobylskij (all in

ZISP).

DESCRIPTION. Female. Body length 2.0 mm; fore wing length 1.8 mm; antennae length 1.5 mm.

Color. Head and mesosoma dark brown; metasoma, venation, tegulae, palpi, antennae, mandibles and legs pale brown.

Head in dorsal view slightly nasiform, as wide as long, slightly wider than mesosoma (16:15), smooth and covered by scattered upstanding setae (Fig. 36).

Temples gradually receding behind eye. Occipital flange very narrow, with trace of sculpture medially. Head in lateral view slightly higher than length (35:32). Eyes setose, its largest diameter as long as malar space. Antennal shelf in front view with coriaceous sculpture below toruli. Face smooth. Head in front view with mouth conus (Fig. 34). Clypeus 0.75 times as high as wide. Tentorial pits large. Labrum small, semicircular, distinctly visible. Mandibles simple.

Antennae slender, broadened apically. A1 0.6 times as long as width of head.

Ratios of length to width of A1‒A15 shown on Fig. 37.

Figs 33–39. Acanosema epicnemium sp. n., ♀ (33–37) and ♂ (38, 39): 33 – mesosoma and base of metasoma, dorsal view; 34 – face; 35 – mesosoma, dorsal view; 36 – head, dorsal view; 37, 38 – antenna; 39 – mesosoma, lateral view. Scale bar 0.2 mm.

Mesosoma weakly compressed, slightly higher than wide (32:29). Neck and pronotal collar situated almost in same plane (Fig. 39). Pronotal anterior corners weakly prominent, sharped. Pronotal collar, corners and pronotal pits covered by scattered long setae; neck dorsally and sides of pronotum bare. Mesoscutum 0.91

times as long as wide, almost flat, covered by few scattered long setae. Notauli deep and complete throughout. Anterior scutellar pit deep, large, rounded and bare. Scutellum large, convex, not widened posteriorly. Axillar depression with two small verriculate tubercle on inner side. Mesopleuron mainly bare medially, without subalar bridge postero-dorsally and with epicnemial bridge antero-ventrally; epicnemial pit deep and pubescent; mesopleural pit totally absent (Fig. 39). Metanotum narrow,

with smooth and bare lateral sides and setose metascutellum; metascutellum with three short longitudinal keels, median keel the highest. Propodeum 0.58 times as long as wide, bare; median propodeal keel simple, plicae process complete (Fig. 35).

Side of propodeum entirely pubescent, with two longitudinal keels. Legs slender.

Wing venation. Fore wing with distinct costal and subcostal veins; radial cell open; distance from marginal vein to basal vein slightly longer than marginal vein length (12:11); marginal vein 5.5 times longer than its wide; stigmal vein twice as long as wide of marginal vein. Poststigmal vein absent. Postmarginal and basal veins nebulous. Radial vein shorter than stigma vein.

Metasoma. Petiole as long as wide, weakly broadened posteriorly, with trace of longitudinal keels, sparsely pubescent dorsally and more densely laterally and ventrally; posterior margin of petiole not arcuate. T 2 anteriorly with three grooves medially, median the longest (Fig. 33); T 3‒ T 6 narrow, bare and smooth medially and with few scattered setae laterally; T 7 and T 8 elongate, compressed laterally,

with few setae. S2 with short longitudinal grooves and dense pubescent at base and weakly pubescent posteriorly; S3‒S5 narrow, smooth, with few scattered setae; S6

with few scattered setae, smooth, distinctly elongate and compressed.

Male. Body length 1.8 mm. Similar to female except following characters:

antenna filiform, slightly shorter than body length; antennomeres cylindrical,

covered by semi-recumbent setae; A1 stout, about 0.5 times as long as width of head; A3 with shallow emargination and keel extending to 0.7 of A3 length; ratios of length to width of A1‒A14 shown on Fig. 38; largest diameter of eyes longer than malar space; petiole elongate 0.80–0.85 times as wide as long; metasoma not compressed at top; T 7 transverse; T 8 and S8 semi-circular; S2–S8 with scattered setae.

VARIATION. Significant variation is not discovered because only one female is known.

DIAGNOSIS. This species distinctly differs from all other Acanosema species by the combination of the following characters: small (1.8–2.0) and sparsely setose species; eyes setose; A1 with simple apical rim; mesopleuron without subalar bridge and with epicnemial bridge; neck and pronotal collar situated almost in same plane

(Fig. 39).

DISTRIBUTION. Russia (Far East).

ETYMOLOGY. The name refers to the presence of the epicnemial bridge in this species which usually absents in Cardiopsilus subgenus species.