Mesochorus propodealis, Riedel, 2018

Riedel, Ravenhorst Matthias, 2018, Contribution to the Palaearctic species of Mesochorus G (Hymenoptera, Ichneumonidae, Mesochorinae): 1. The M. fulvus-group, Linzer biologische Beiträge 50 (1), pp. 687-716 : 700-701

Mesochorus propodealis nov.sp. ( figs 46-51 )

Holotypus: (♀) Russia, East Siberia, Transbaikalia, Karymskaya, rightfeederof Ingoda River, 4.VIII.1975, leg. D. Kasparyan (St. Petersburg).

Paratypes: (♀♂) Russia, Kaliningrad Prov., Curonian Spit (=Kurshskaya kosa), 34-35 th km, Alnus, Betula, litter, 4.VII.1988, leg. A. Khalaim) (St. Petersburg); (3♀♀) Russia, East Siberia. Krasnoyarsk, Akademgorodok, betuletum, 28.VII.1988, leg. D. Kasparyan (St. Petersburg and coll. Riedel); (♀) W. Siberia, r. Taz, Krasnoselkup. 17.08.992, leg. D. Kasparyan (St. Petersburg); (♀) Yakutia, 10 km SSW of Yakutsk, Rechevaya shkola, “kolki” with Betula, Rosa (forest outliers), 13.VII.1990, leg. D. Kasparyan (St. Petersburg); (♂) Mongolia, 100 km E Iulanbatar, 20 km NE Terektz, Tuul riv., 15-21.VII.2003, J. Halada leg. (Linz); (♀) Italia Liguria, Triova (IM), Calla Sauson 26.VII.1986 Scaramozzino legit (Munich); (♀) TR: Artvin, Genya Mt. 28.VII.2004, 1625m, leg. S. Çoruh (Erzurum); (♂) S- Russia, Rostov reg., Veshenskaja, 2.8.2006, E. Khachikov leg. (Linz).

Description: ♀: Bodylength 7-9.5 mm. Flagellawith 41-43 segments; 1 st flagellomeres length c.6x width and 0.62-0.65x eye length; 2 nd flagellomeres length 4.0- 4.5x width; preapical flagellomeres c.2x longer than wide. Temples roundly but strongly narrowed behind eyes, length 0.5-0.6x eye width. Ocelli large, OOD 0.7-0.9. Face with parallel or divergent sides ventrally, densely and coarsely punctate, width 1.15x length of clypeus+face and 0.85x eye length. MI 0.2-0.4. Mandibles with equal teeth. Malar spaces and ventral 0.2 of facial orbits finely striate. Occipital carina complete medially. Genal carinae reach the hypostomal ones far from mandibular bases. Mesoscutum with coarse and dense punctures caudal-medially and with dense but superficial punctures laterally; mesopleura with fine dense punctures dorsally and coarse and moderately dense punctures ventrally; metapleura with dense fine punctures. Propodeum - seen from lateral - distinctly angled between frontal horizontal and apical vertical parts, not roundly declined. Area basalis rectangular, usually confluent with area superomedia, c.1.5x longer than wide; area superomedia short, length 2.0x width and 0.7-1.0x as long as area petiolaris, costulae in or slightly frontal to its middle; area petiolaris large, length almost half the length of propodeum and 1.1-1.2x width. Hind femora length 4.7-5.3x height; hind metatarsi length 0.47x length of hind tibiae; hind claws slender, their apices strongly bent, with about 4-5 short and narrowly spaced basal teeth; distal fore tarsomeres very slender, length 3.2-3.4x width. Areolets shortly stalked or pointed and oblique; 2 nd recurrent veins proximal to their middle; nervuli interstitial or slightly post- or antefurcal; postnervuli intercepted in basal 0.3-0.4; pterostigma length c.3.5-3.6x width, radial veins in their distal 0.63. 1 st tergite length 2.5-2.7x width; postpetiolus smooth, length 1.3-1.4x width; 2 nd tergite length 0.95-1.1x width; thyridia roundish. Ovipositor sheaths length 7.1-7.7x height and 0.85-0.9x length of hind metatarsi.

Colour: (Brownish)-red. Palps, mandibles except teeth, genae, wide facial orbits, hind edges of pronotum, tegulae, and wing bases yellow to cream-yellow. Pterostigmata hyaline or hyaline-ochreous.

♂: Body length 7-8 mm. Flagella with 39-41 segments. Hind femora length 5.0x height. Nervuli usually slightly postfurcal. 1 st tergite length 3.0x width; postpetiolus length 1.7x width. Hind claws with 2-3 short basal teeth. Claspers pointed apically, length 1.3-1.4x length of 2 nd hind tarsomeres. Otherwise as described for the ♀.

Colour: Reddish. Palps, mandibles, and genae cream-yellow. Mesoscutum yellowish, with two lateral and one median brownish-red stripe; scutellum pale yellow, with brownish-yellow baso-medial spot. Legs reddish-yellow.

Hosts unknown.

Distribution: Italy, Mongolia, Russia (Rostov region, Siberia, Far East), Turkey.

Figures

Figs 46-51: Mesochorus propodealis nov.sp. ♀: (46) head, (47) propodeum from dorsal, (48) propodeum from lateral, (49) head, (50) ovipositor sheaths, (51) clasper (♂).