Acanosema (Cardiopsilus) setigerum 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 : 21-23

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

http://zoobank.org/NomenclaturalActs/ C0E34B04-E01C-4891-85FE-280F7A313A67

Figs 64–69

TYPE MATERIAL. Holotype – ♀, Russia: Sakha Republic (=Yakutia), Tomtor ,

soil traps, 8–27.VIII 1990, S. K. Alekseev leg. ( ZISP). Paratypes – Russia: Sakha

Republic, Nizhny Bestyakh, Disogudai Lake, soil traps, 9–15. VIII 1990, 1 ♀, S. K.

Alekseev ( ZISP). Sweden: S: Sm.Torsås. Tjärekulla, 18. VI .1989, 1 ♀, R . Danielsson

( NMPC).

DESCRIPTION. Female. Body length 3.3 mm; fore wing length 1.1 mm;

antennae length 1.8 mm.

Colour. Head, mesosoma and distal part of antenna dark brown; metasoma, venation, proximal half of antennae, mandibles and legs reddish brown; palpi pale brown.

Head in dorsal view weakly nasiform, 1.1 times as long as wide, as wide as mesosoma, smooth and covered by numerous scattered semi-recumbent setae ( Fig.

65). Temples gradually receding behind eye. Occipital flange very narrow, bare.

Head in lateral view slightly higher than length (38:35). Eyes setose, its largest diameter shorter than malar space (13:16). Face mainly smooth, only with coriaceous sculpture below toruli. Head in front view with mouth conus ( Fig. 68 ).

Clypeus 0.67 times as high as wide. Tentorial pits small. Labrum small, semicircular,

distinctly visible. Mandibles simple.

Antennae slender, weakly broadened apically. A1 0.7 times as long as width of head. Ratios of length to width of A1‒A15 shown on Fig. 69 .

Mesosoma slightly compressed, slightly higher than wide (19:17). Neck and pronotal collar almost perpendicular to each other ( Fig. 67 ). Pronotal anterior corners weakly prominent, rounded. Pronotal collar, corners, pronotal pits and areas in front of pronotal spiracle covered by scattered long setae; neck dorsally and sides of pronotum bare. Mesoscutum 0.82 times as long as wide, convex, covered by scattered long setae. Notauli deep and complete throughout. Anterior scutellar pit deep, large,

rounded and bare. Scutellum large, convex, weakly widened posteriorly. Axillar depression with one verriculate tubercle anteriorly. Mesopleuron bare medially and pubescent dorsally and ventrally, without subalar bridge postero-dorsally and epicnemial bridge antero-ventrally; epicnemial pit deep and densely pubescent;

mesopleural pit totally absent ( Fig. 67 ). Metanotum narrow, with almost smooth and bare lateral sides and setose metascutellum; metascutellum with three short longitudinal keels, median keel the highest. Propodeum 0.4 times as long as wide,

bare; median propodeal keel bifurcate from base, plicae process complete ( Fig. 66 ).

Side of propodeum entirely pubescent, with two longitudinal keels ( Fig. 67 ). Legs slender.

head and propodeum, dorsal view; 66 – mesosoma and base of metasoma, dorsal view; 67 –

mesosoma, lateral view; 68 – face; 69 – antenna. Scale bar: 64 – 1 mm; 69 – 0.5 mm; 65–68 –

0.2 mm.

Wing venation. Fore wing short, reaching to middle of T2, with distinct costal,

subcostal, basal and marginal veins; radial cell open; distance from marginal vein to basal vein as long as marginal vein; marginal vein 4.4 times longer than its width;

stigmal vein indistinct, nebulous. Poststigmal and postmarginal veins absent. Radial vein absent.

Metasoma. Petiole 0.8 times as long as wide, weakly broadened posteriorly, with inrregular sculpture and median longitudinal keel which higher projecting posteriorly,

bare dorsally and pubescent laterally and ventrally; posterior margin of petiole weakly arcuate. T2 with few setae, short longitudinal grooves at base ( Fig. 66 ), and covered by numerous homogeneous upstanding short setae in posterior half; T3‒T6

and S3‒S5 narrow, entirely with upstending short setae and with micropunctuation medially; T7 and T8 elongate, compressed laterally, pubescent. S2 with very small protuberance and dense pubescent at base and entirely pubescent posteriorly ( Fig.

64); S6 with numerous setae, smooth, distinctly elongate and compressed.

Male. unknown

VARIATION. Body length 3.0– 3.3 mm. Genae in front view more or less convex. Holotype with short wings, paratypes with wings broken at base and with long wings almost reaching to the top of metasoma. Distance from marginal vein to basal vein as long as marginal vein to slightly longer; marginal vein 4.4–5.2 times longer than its width; stigmal vein nebulous to distinct, twice as long as width of marginal vein. Radial vein absent in brachypterous specimen or as long as stigma vein in macropterous specimen. Median keel on petiole distinct and quite high posteriorly to absent.

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

А15 as wide as А14; side of pronotum antero-ventrally from pronotal spiracle setose; mesopleuron without subalar bridge and epicnemial bridge; S2 with very small protuberance at base; posterior part of T2 and S2, T3–T7 and S2–S6 covered by homogenous semi-erect pubescence.

DISTRIBUTION. Russia (Sakha Republic), Sweden.

ETYMOLOGY. The name is derived from the Latin adjective setigeris (bristly)

and refers to homogenous short pubescence of metasomal terga and sterna.

Figures

Figs 64–69. Acanosema setigerum sp. n., ♀ (holotype): 64 – habitus, lateral view; 65 –