Acanopsilus minimus 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 : 7-11

Acanopsilus minimus Chemyreva et Kolyada , sp. n.

http://zoobank.org/NomenclaturalActs/ 97B58500-1080-4E38-89A9-33659AC69867

Figs 4 , 18–24

TYPE MATERIAL. Holotype – ♀, Russia, Primorsky krai, near Spassk-Dalniy ,

6–10.IX 2001, S. Belokobylskij ( ZISP). Paratypes – Russia. Sakhalinskaya oblast :

Kunashir Island, 22.VIII–1.IX 1973, 1 ♂, D. Kasparyan; Primorsky krai: Lazo Nature Reserve, 18 km SE of Lazo, 26.VIII 2006, 1 ♀, S. Belokobylskij; near SpasskDalniy, 26.VI–5.VII 2007, 1 ♂, S. Belokobylskij; Shkotovskiy Distr. , Peyshula ,

25. VI 1972 , 1 ♂, V. Kuslitzky; Troitsa Bay , 12–16.VII 1972, 1 ♂, M. Kozlov;

Tachingouza Bay [Lazo Nature Reserve], 9–10.VIII 1972, 1 ♀, M. Kozlov (all in

DESCRIPTION. Female. Body length 2.1 mm; fore wing length 2.0 mm; antennae length 1.4 mm.

Color. Entirely body and A3–A14 brown; venation and tegulae pale brown;

mandibles, palpi, A1–A2, and legs yellow.

Head in dorsal view not nasiform, 0.9 times as long as wide, wider than mesosoma (30:28), smooth and covered by long scattered setae ( Fig. 18 ). Temples gradually receding behind eye. Occipital flange very narrow, smooth. Head in lateral view slightly

13 – head, dorsal view; 14 – mesosoma and base of metasoma, dorsal view; 15 – face; 16, 17

– antennae. Scale bar: 12 – 1 mm; 16, 17 – 0.5 mm; 13–15 – 0.2 mm.

higher than length (14:15). Eyes setose, its largest diameter as long as malar space.

Antennal shelf in front view smooth. Face smooth. Head in front view with mouth conus ( Fig. 19 ). Clypeus 0.71 times as high as wide. Tentorial pits large. Labrum small, semicircular, distinctly visible. Mandibles simple.

mesosoma, dorsal view; 19 – face; 20 – habitus, lateral view; 21, 22 – antennae; 23 – antenna,

proximal part; 24 – mesosoma, proximal part of metasoma and forewing venation, dorsal view. Scale bar: 20 – 1 mm; 22 – 0.5 mm; 18, 19, 21, 23, 24 – 0.2 mm.

Antennae slender, weakly broadened apically. A1 0.84 times as long as width of head. Ratios of length to width of A1‒A14 shown on Fig. 21 .

Mesosoma slightly compressed, slightly higher than wide (33:26). Neck and pronotal collar situated perpendicularly to each other ( Fig. 4 ). 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 0.8

times as long as wide, convex, covered by scattered long setae. Notauli deep and complete throughout. Anterior scutellar pit deep, large, bare and rounded.

Scutellum large, convex, widened posteriorly. Axillar depression without verriculate tubercles. Mesopleuron mainly bare, with subalar bridge postero-dorsally and without epicnemial bridge antero-ventrally; epicnemial pit deep and weakly pubescent; mesopleural pit totally absent ( Fig. 4 ). Metanotum narrow, with smooth and bare lateral sides and pubescent metascutellum; metascutellum with three short longitudinal keels, median keel the highest. Propodeum 0.53 times as long as wide, sparsely pubescent posteriorly and more dense anteriorly, median propodeal keel bifurcate from base, plicae process complete ( Fig. 24 ). 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; marginal vein longer than distance from it to basal vein (11:9); marginal vein 5 times longer than its wide; stigmal vein twice as long as wide of marginal vein ( Fig. 24 ). Poststigmal vein absent. Postmarginal vein nebulous. Radial vein as long as stigma vein.

Metasoma. Petiole cylindrical, elongate 0.73 times as wide as long, with traces of longitudinal keels, bare dorsally and densely pubescent laterally and ventrally;

posterior margin of petiole not arcuate. T2 anteriorly with short grooves, the medial slightly longer than others ( Fig. 24 ); T3‒T6 narrow, with few setae and fine micropunctation medially and numerous setae laterally; T7 and T8 elongate, compressed laterally, pubescent. S2 without protuberance anteriorly, with short grooves and dense pubescent at base and almost bare posteriorly; S3‒S5 narrow, with numerous long setae; S6 pubescent, distinctly elongate and compressed.

Male. Body length 1.6–1.9 mm. Similar to female except following characters:

antenna filiform, slightly longer than body length; antennomeres cylindrical, covered by long (about 1.3 times longer than width of appropriate antennomer) semi-erect setae; A1 stout, about 0.5 times as long as width of head; A3 with shallow emargination and keel extending to half of A3 length; ratios of length to width of A1‒A14

shown on Fig. 22 ; petiole weakly more elongate 0.60–0.65 times as wide as long;

metasoma not compressed at top; T7 transverse; T8 and S8 semi-circular; S2–S7

with numerous semi-recumbent scattered setae; S8 finely pubescent.

VARIATION. Female. Body length 1.8–2.1. Significant variation is not detected.

DIAGNOSIS. This species distinctly differs from all other Acanopsilus species by the combination of the following characters: small (1.6–2.1), brunneous and sparsely hairy species; eyes setose; A1 with simple apical rim; pronotal pit weakly setose; mesopleuron with subalar bridge and without epicnemial bridge; median propodeal keel bifurcate from base; marginal vein as long as distance from it to basal vein; base of Т2 with a few long setae laterally; S2 without protuberance anteriorly.

ETYMOLOGY. The name refers to the relatively small size of this new species.

Figures

Figs 1–4. Mesosoma, lateral view: 1 – Acanopsilus heterocerus; 2 – Acanosema nervosum;

Figs 18–24. Acanopsilus minimus sp. n., ♀ (18–21, 24) and ♂ (22, 23): 18 – head and