Mesochorus fulvus, Thomson, 1886

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 : 688-690

publication ID	https://doi.org/ 10.5281/zenodo.4031076
persistent identifier	https://treatment.plazi.org/id/03DA87AD-FF92-1264-FEFC-FA73FBF08653
treatment provided by	Admin
scientific name	Mesochorus fulvus
status

Treatment

Key of the Palaearctic species of the fulvus View in CoL -group

of Mesochorus GRAVENHORST

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1 Pterostigmas brown, usually with paler proximal and distal edges. ....................................2

- Pterostigmas hyaline, yellowish or pale hyaline-ochreous..................................................4

2 Ocelli small, OOD c.1.4 ( fig. 57 View Figs 56-59 ). Hind claws with about five long teeth ( fig. 59 View Figs 56-59 ). Mesopleura densely punctate. 2 nd tergite wider than long. Ovipositor sheaths blackish. ...... .......................................................................................................... M. lapponator nov.sp.

- Ocelli large, OOD <1 ( fig. 63 View Figs 60-64 ). Mesopleura with scattered punctures ventrally. 2 nd tergite longer than wide.......................................................................................................3

3 Lower mandibular teeth distinctly larger than the upper ones ( fig. 60 View Figs 60-64 ). Hind claws with six densely spaced basal teeth ( fig. 62 View Figs 60-64 ). Hind tibiae narrowly and indistinctly infuscate at apex. OOD c.0.8 ( fig. 63 View Figs 60-64 ). Russia (Far East)...................... M. pseudolapponicus nov.sp.

- Mandibles with equal teeth ( fig. 52 View Figs 52-55 ). Hind claws with 2-3 short basal teeth. Ocelli very large, OOD c.0.6. Hind tibiae not infuscate apically........... M. lapponicus View in CoL THOMSON, 1885

4 Lower mandibular teeth larger than the upper ones ( figs 14 View Figs 14-17 , 29). Ovipositor sheaths slender, length>7.5xwidth. Ocellismaller, OODatmost 1.0 ( figs 16 View Figs 14-17 , 26 View Figs 25-28 , 31)..................5

- Mandibular teeth of equal size. Ovipositor sheaths variable. Ocelli usually larger, OOD often>1.0............................................................................................................................7

5 Ocelli rather large, OOD c.1.0 ( fig. 16 View Figs 14-17 ). Lower mandibular teeth slightly larger than the upper ones. Area superomedia very long and slender, length c.3.3x width ( fig. 15 View Figs 14-17 )............. ......................................................................................... M. fulgurator View in CoL HORSTMANN, 2006

- Ocelli smaller, OOD 1.6-1.8 ( figs 26 View Figs 25-28 , 31). Lower mandibular teeth distinctly longer than the upper ones. Area superomedia wider, length 2.1-2.2x width ( fig. 30)...................6

6 Area basalis stalked apically, area petiolaris wider than long ( fig. 32). Face not widened, width 1.1x length of clypeus+face. Distal fore tarsomeres stouter, length c.2.3xwidth. ..................................................................... M. heterodon View in CoL HORSTMANN, 2006

- Area basalis trapezoid, not stalked apically; area petiolaris longer than wide. Face very wide, width 1.2x length of clypeus+face ( fig. 25 View Figs 25-28 ). Distal fore tarsomeres slender, length c.3.2xwidth........................................................................................... M. fulvoides nov.sp.

7 Genal carinae reaching the hypostomal ones close to mandibular bases (distance c.0.3x length of malar spaces. Distal tarsomeres slightly swollen, length c.2.7x width ( fig. 3 View Figs 1-4 ) ....... ........................................................................................... M. agnellonis View in CoL SCHWENKE, 1999

- Genal carinae reaching the hypostomal ones far from mandibular bases (distance>0.5x length of malar spaces). Apical tarsomeres differing ..........................................................8

8 Propodeum - seen from lateral - strongly arched ( fig. 48 View Figs 46-51 ). Area petiolaris large, longer than wide, length about half the length of propodeum ( fig. 47 View Figs 46-51 ). Hind claws slender and long, with 5-6 densely spaced teeth in the basal half. Sides of face slightly divergent ventrally ( fig. 46 View Figs 46-51 ) ............................................................................. M. propodealis nov.sp.

- Propodeum roundly sloping to apex. Area petiolaris distinctly shorter than half the length of propodeum ...........................................................................................................9

9 Ocellismaller, OOD 0.8-1.0 ( fig. 12 View Figs 9-13 ). Face often two-coloured; mandibles, genae and ventral facial orbits cream-yellow or yellowish, face reddish. ..........................................10

- Ocelli very large, OOD 0.5-0.7 ( fig. 22 View Figs 18-24 ). Face reddish, usually without distinct creamyellow orbits......................................................................................................................12

10 Face narrower, width c.0.9x eye length. Smaller, body length 5-6 mm. Distal fore tarsomeres slender ( fig. 7 View Figs 5-8 ) ................................................. M. britannicus View in CoL SCHWENKE, 1999

- Face wide, width 1.0-1.1x eye length. Usually larger, body length 6-8 mm .....................11

11 Distal fore tarsomeres slightly swollen, length 2.5-2.6x width ( fig. 11 View Figs 9-13 ). Temples moderately narrowed behind eyes ( fig.12 View Figs 9-13 ). Occipital carina complete medially................... ....................................................................................................... M. flavoorbitalis nov.sp.

- Distal fore tarsomeres slender, length c.3x width. Temples strongly narrowed behind eyes ( fig. 68 View Figs 65-69 ). Occipital carina shortly interrupted medially. ............. M. caucasicus nov.sp.

12 Ovipositor sheaths very short, length <5x height ( fig. 44 View Figs 39-45 ). Hind claws with long teeth ( fig. 43 View Figs 39-45 ), strongly bent at apex. Subbasal cells of front wings almost bare in proximal half ( fig. 40 View Figs 39-45 ) ............................................................................... M. pelvis View in CoL SCHWENKE, 2002

- Ovipositorsheathslonger, length>6x height ( figs 24 View Figs 18-24 , 38 View Figs 33-38 ). Hindclawssometimeswith finer pectination, less strongly bent apically. Subbasal cells of front wings at least with scattered hairs in proximal half .........................................................................................13

13 Hind claws with strong teeth over whole length ( fig. 23 View Figs 18-24 ). Distal fore tarsomeres slightly swollen, length 2.4-2.6xwidth ( fig. 20 View Figs 18-24 ) ..................................... M. fulgurans View in CoL CURTIS, 1833

- Hind claws with fewer basal teeth ( fig. 36 View Figs 33-38 ). Distal fore tarsomeres slender, length c.2.8- 3xwidth ( fig. 37 View Figs 33-38 )............................................................................ M. laricis View in CoL HARTIG, 1838