Diadegma (Neoangitia) caucasicum, Riedel & Japoshvili, 2021

Riedel, Matthias & Japoshvili, George, 2021, New records of Ichneumonidae from Northwestern Sakartvelo (Georgia), with additions to the fauna of Lagodekhi reserve, Linzer biologische Beiträge 53 (1), pp. 241-288 : 277-278

Diadegma (Neoangitia) caucasicum nov.sp. ( figs 7-13 )

H o l o t y p u s: (♀) " Georgia, Tsageri, Dogurashi, 997 m alt., 42.670582°N, 42.783149°E, 19- 25.VII.2020, Malaise trap, leg. G. Japoshvili" (Tbilisi).

P a r a t y p e s: (♀) " Georgia, Tsageri , Dogurashi, 997 m alt., 42.670582°N, 42.783149°E, 19- 25.VII.2020, Malaise trap, leg. G. Japoshvili "; (♀) " Georgia, Tsageri , Dogurashi, 1489 m alt., 42.696151°N, 42.812965°E, 19-25.VII.2020, Malaise trap, leg. G. Japoshvili " (coll. Riedel) .

D e s c r i p t i o n: ♀: Body length 4.5-5.5 mm. Flagellum with 22-24 flagellomeres, stout; preapical flagellomere 1.2× longer than wide. Head granulate, dull, covered with fine whitish hairs. Temple moderately and roundly narrowed behind eyes, dorsally 0.65×as long as eye. Distance between lateral ocellus and eye 0.8-0.9× and between lateral ocelli 1.1-1.2× ocellar diameter. Sides of face slightly convergent ventrally, minimally 0.47× as wide as head. Malar space 0.6× as long as width of mandibular base. Genal carina reaching hypostomal carina away from mandibular base, both carinae low.

Side of pronotum finely rugose dorsally, with fine longitudinal striation ventrally. Mesoscutum granulate, dull. Mesopleural disc granulate, without distinct punctation, dull, dorsally with few fine rugae; speculum with microsculpture but strongly shining. Propodeum granulate. Area basalis triangular, about as long as wide, with long apical stalk. Area superomedia slightly wider than long and confluent with area petiolaris, caudal sides slightly divergent. Anterior transverse carina (costula) absent. Area petiolaris moderately impressed medially, granulate, without rugae. Hind femur 4.4-4.6× as long as wide. Claws as long as their pulvilli; hind claw with two or three strong basal teeth. Areolet ± oblique, stalked frontally; vein 2m-cu distad its middle; vein 1cu-a postfurcal by 2-3× its width.

Metasoma rather slender. 1 st tergite 2.2-2.4× longer than wide, with strong glymma. Postpetiolus 0.90× as long as wide, with rounded sides. 2 nd tergite 1.25-1.40× longer than wide. 3 rd tergite 0.85-0.90× as long as wide. Basal tergites granulate and dull. Apical tergites from the 4 th on with fine microsculpture dorsally, smooth and with fine and scattered setiferous punctures laterally and apically. 6 th tergite distinctly excavate medio-dorsally; 7 th tergite with a deep, rectangular to trapezoid incision medio-dorsally. Ovipositor sheath 1.15-1.25× longer than hind tibia. Ovipositor continuously and distinctly curved upwards, not thickened medially; ventral valve smooth, tip of dorsal valve with triangular incision.

Color: black. Palps and tegula cream-yellow. Mandible reddish-yellow medially. Tergites entirely blackish. Coxae black; fore and mid trochanters yellowish, weakly infuscate basally, hind trochanter black. Trochantelli yellowish. Legs otherwise mainly reddish; hind tibia reddish-yellow, cream-yellow basally, with weak subbasal and distinct but narrow apical blackish bands. Hind metatarsus and 2 nd tarsomeres ±

yellowish basally, with infuscate tips; following hind tarsomeres blackish. Wings hyaline; pterostigma hyaline-yellowish.

♁ unknown.

R e m a r k: This new species belongs to the subgenus Neoangitia HORSTMANN. Members of this subgenus are characterized by the strongly shining apical tergites and the deep and rectangular or trapezoid form of the medio-dorsal excision of 7 th tergite.

Due to its long ovipositor and weak dark coloration of hind tibia, the new species runs to Diadegma coleophorarum (RATZEBURG) , but differs by a slightly longer ovipositor sheath, apically open area superomedia, distinct medio-dorsal excavation of 6 th tergite, black fore and mid coxae and entirely black scape.

Figures

Figs 7-8: Diadegma caucasicum nov.sp.: (7) apical tergites from lateral, (8) hind tibia and metatarsus from lateral.

Figs 9-13: Diadegma caucasicum nov.sp.: (9) face from frontal, (10) head from dorsal, (11) mesopleuron from lateral, (12) propodeum from dorsal, (13) apical tergites from dorsal.