Acanosema (Cardiopsilus) dentigastrum 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 : 12-14

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

http://zoobank.org/NomenclaturalActs/ 92E9DEB8-24F1-4AD0-8ECD-366CCCFAC45D

Figs 25–32

Figs 25–32. Acanosema dentigastrum sp. n., ♀ (25–27, 30–32) and ♂ (28, 29): 25 –

mesosoma and base of metasoma, dorsal view; 26, 28 – face; 27, 29 – antenna; 30 – mesosoma, lateral view; 31 – head, dorsal view; 32 – habitus, lateral view. Scale bar: 32 – 1 mm;

26–31 – 0.2 mm.

TYPE MATERIAL. Holotype – ♀, Russia: Primorsky krai, vicinity of Anisimovka, Krinichnaya Mt. , 14–15.VIII 2006, S. Belokobylskij ( ZISP) . Paratypes –

Russia: Primorsky krai: Lazo Nature Reserve , 9–17.VII 2008, 1 ♂, A. Khalaim ;

Lazo Nature Reserve, 18 km SE of Lazo, 26.VIII 2006, 1 ♀, S. Belokobylskij (all in

ZISP).

DESCRIPTION. Female. Body length 2.8 mm; fore wing length 2.1 mm; antennae length 1.8 mm.

Color. Head dark brown, mesosoma weakly pale than head; metasoma reddish brown; venation, tegulae, palpi, proximal part of antennae and legs pale brown;

mandibles and distal part of antennae brown.

Head in dorsal view slightly nasiform, 0.92 times as long as wide, wider than mesosoma (38:32), smooth and covered by long semi-erect setae (Fig. 31). Temples gradually receding behind eye. Occipital flange very narrow, smooth. Head in lateral view slightly higher than length (20:19). 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. 26). Clypeus 0.8

times as high as wide. Tentorial pits large. Labrum small, semicircular, hardly visible. Mandibles simple.

Antennae slender, broadened apically. A1 0.7 times as long as width of head.

Ratios of length to width of A1‒A15 shown on Fig. 27.

Mesosoma slightly compressed, slightly higher than wide (41:34). Neck and pronotal collar almost perpendicular to each other (Fig. 30). 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 0.93

times as long as wide, convex, covered by fine long pubescent. Notauli deep and complete throughout. Anterior scutellar pit deep, large, rounded and bare. Scutellum large, convex, widened posteriorly. Axillar depression with one verriculate tubercle anteriorly. Mesopleuron bare medially, and pubescent elsewhere, with subalar bridge postero-dorsally and without epicnemial bridge antero-ventrally; epicnemial pit deep and weakly pubescent; mesopleural pit totally absent (Fig. 30). Metanotum narrow, with smooth and bare lateral sides and setose metascutellum;

metascutellum with three short longitudinal keels, median keel the highest.

Propodeum 0.55 times as long as wide, bare; median propodeal keel simple, plicae process complete (Fig. 25). Side of propodeum entirely finely pubescent, with two longitudinal keels. Legs slender.

Wing venation. Fore wing with distinct costal, subcostal and basal veins; radial cell open; distance from marginal vein to basal vein longer than marginal vein length

(15:13); marginal vein 6 times longer than its wide; stigmal vein twice as long as wide of marginal vein. Poststigmal vein absent. Postmarginal vein nebulous. Radial vein as long as stigma vein.

Metasoma. Petiole weakly transverse 0.85 times as long as wide, weakly broadened posteriorly, with few longitudinal keels, bare dorsally and densely pubescent laterally and ventrally; posterior margin of petiole weakly arcuate. T 2 anteriorly with few setae short longitudinal striation medially and small pointed projection laterally (Fig. 25); T 3‒ T 6 narrow, with fine micropunctation medially and few setae laterally; T 7 and T 8 elongate, compressed laterally, with few setae. S2 with large protuberance and dense pubescent at base and entirely pubescent posteriorly (Fig.

32); S3‒S5 narrow, smooth, with few scattered setae; S6 with few scattered setae,

smooth, distinctly elongate and compressed.

Male. Body length 2.3 mm. Similar to female except following characters:

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

covered by semi-erect setae; A1 stout, about 0.5 times as long as width of head; A3

with shallow emargination and keel extending to 0.6 of A3 length; ratios of length to width of A1‒A14 shown on Fig. 29; temples sharply receding behind eyes; genae sharply receding to mouthparts above eyes (Fig. 28); petiole elongate 0.8 times as wide as long; metasoma not compressed at top; T 7 transverse; T 8 and S8 semicircular; S2–S7 with numerous semi-recumbent scattered setae; S8 finely pubescent.

VARIATION. Female. Body length 2.8–3.6. Distance from marginal vein to basal vein longer to equal to marginal vein length.

DIAGNOSIS. This species distinctly differs from all other Acanosema species by the combination of the following characters: eyes setose; A1 with simple apical rim;

mesopleuron with subalar bridge and without epicnemial bridge; T 2 anteriorly with small pointed projection laterally; S2 with large protuberance at base.

DISTRIBUTION. Russia (Far East).

ETYMOLOGY. The name is derived from the Latin nouns dente and gaster and refers to the pointed basolateral projection on T 2.