Yezoceryx Uchida 1928
Creators: name: Achterberg, Cornelis Van
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Ichneumonidae
Yezoceryx

description: Key to Vietnamese species of Yezoceryx
1. Occipital carina medially down-curved dorsally (Figs 1 c, 9d, 10d, 11c)...........................................2
-. Occipital carina evenly curved dorsally (Figs 6 a, 12b, 13d, 15d, 17a).............................................5
2. Body colour blue purple, without yellow marks (Fig. 11)............................... .. Yezoceryx purpuratus Sonan
-. Body colour black with yellow marks...................................................................... 3
3. Body black except face, anterior face of fore leg, anterior face of mid trochanter, trochantellus and femur, very narrow apical bands on tergite 3 onwards yellow; mesosoma covered with whitish setae (Fig. 10)............... Yezoceryx phui sp. nov.
-. Body with more extensive yellow markings; mesosoma covered with golden setae..................................4
4. Face yellow, with small black spot medio-dorsally; flagellum entirely black in both sexes; mesosoma with many yellow spots on mesopleuron, metapleuron, scutellum, postscutellum, and sides of propodeum (Fig. 1)................................................................................................... Yezoceryx albimaculatus Sheng & Sun
-. Face medially with longitudinal black stripe reaching clypeus; median flagellomeres of female whitish; mesosoma without yellow spots except yellow apex of scutellum (Fig. 9)................................... Yezoceryx pacoensis sp. nov.
5. First metasomal tergite elongate, more than twice as long as its posterior width; posterior margin of first sternite extending at least to 0.6 of distance to spiracle or in most cases extending nearly to level of spiracle..............................6
-. First metasomal tergite broader, 1.4–2.0× longer than its posterior width; first sternite shorter, extending to 0.4–0.5 the distance to level of spiracle....................................................................................12
6. Body entirely reddish; fore wing about 11 mm [ovipositor about 4.5× as long as hind tibia] (Fig. 18)................................................................................................... Yezoceryx walkleyae Momoi
-. Body with different colour pattern, with some black markings on at least head or metasoma; fore wing shorter than 9 mm ...7
7. Female with flagellum uniform in colour, without whitish flagellomeres medially [mesopleuron with punctures dorsally] (Fig. 12)........................................................................... Yezoceryx qinlingensis Wang
-. Female with some whitish flagellomeres medially............................................................8
8. Body largely reddish, mesopleuron and propodeum without any black marks......................................9
-. Body reddish brown to blackish, always with black marks on mesosoma and/or metasoma........................... 10
9. Metasomal tergites entirely reddish; head dorsally and gena black [in male gena yellow]; scuto-scutellar groove with two longitudinal ridges (Fig. 2)......................................................... Yezoceryx bicarinatus sp. nov.
-. Metasomal tergite 3 onwards dark; head including face blackish; scuto-scutellar groove with six longitudinal ridges (Fig. 13)................................................................................... Yezoceryx rufus sp.nov.
10. Clypeus very short, about 0.25× as high as wide, at base deeply impressed; exposed part of labrum about 0.5× as long as its basal width; anterior part of second abscissa of hind wing vein Cu 1 absent (Fig. 15)......... Yezoceryx tamdaoensis sp. nov.
-. Clypeus about 0.5× as high as wide, without any impression at base; exposed part of labrum shorter, about 0.2 to 0.3× as long as its basal width (Figs. 7 b, 8b); second abscissa of hind wing vein Cu 1 present................................... 11
11. Face entirely yellow in both sexes; pronotum densely set with ridges; mesosoma reddish brown with black marks; ovipositor about 2.6–3.1× as long as hind tibia (Fig. 7)............................................ Yezoceryx maculatus Chao
-. Face of female largely black; pronotum smooth, without ridges; pronotum, mesoscutum and mesopleuron entirely black (Fig. 8); ovipositor about 4.0× as long as hind tibia.......................................... Yezoceryx nebulosus Wang
12. Flagellum with some median flagellomeres whitish; mesosoma entirely reddish, without any black marks (Fig.16)........................................................................................... Yezoceryx thaii sp. nov.
-. Flagellum black, some basal flagellomeres may be paler but never with median whitish flagellomeres; mesosoma yellow to reddish yellow, usually with black marks..................................................................13
13. Ovipositor short, about as long as hind tibia; mesosoma yellow, without any black marks; first sternite with round swelling (Fig. 3).......................................................................... Yezoceryx brevius sp. nov.
-. Ovipositor longer, at least 1.8× as long as hind tibia; mesosoma with black marks; first sternite with sharp forward pointing hook, sometimes present as blunt tubercle in small males.....................................................14
14. Mesoscutum with U-shaped black mark across lateral lobes and posterior margin, plus a black mark of varying size on median lobe (Figs 6 a, 17a)....................................................................................15
-. Mesoscutum with black marks differing from above.........................................................16
15. Median carina of frons extending to face forming a broad tubercle between antennal sockets; scuto-scutellar groove with one median and two lateral longitudinal ridges, lateral ridges sometimes weak (Fig. 6); first tergite 1.7–1.9× as long as its apical width; ovipositor about 2.5× as long as hind tibia................................... Yezoceryx maculataexcels Wang
- Median carina of frons forming a sharp lamella between antennal sockets (Fig. 17); scuto-scutellar groove with different numbers of ridges, but no ridges medially; first tergite shorter, 1.4–1.6× as long as its apical width; ovipositor about 1.8× as long as hind tibia...................................................................... Yezoceryx umaculosus Wang
16. Mesoscutum without black marks on lateral lobes; first sternite with pointed hook (Fig. 5)........ Yezoceryx lii Sheng & Sun
-. Mesoscutum with black marks on lateral lobes; first sternite with blunt hook......................................17
17. Mesoscutum with black mark nearly in the shape of a crown; fore wing with an apical dark spot, plus a blackish spot below pterostigma; first sternite with rounded hook; length of ovipositor 1.8× as long as hind tibia (Fig. 4)................................................................................................... Yezoceryx coronatus sp. nov.
-. Mesoscutum with rhombic black mark on median lobe connecting with black mark in front of scutellum and reddish brown stripe on lateral lobe fore wing with an apical dark spot but without a blackish spot below pterostigma; first sternite with a shallow longitudinal groove dividing the hook into two peaks; length of ovipositor 2.9× as long as hind tibia (Fig. 14).......................................................................................... Yezoceryx shengi sp. nov.
description: Published as part of Achterberg, Cornelis Van, 2017, First record of the genus Yezoceryx Uchida (Ichneumonidae: Acaenitinae) from Vietnam, with descriptions of nine new species, pp. 345-372 in Zootaxa 4311 (3) on pages 346-347, DOI: 10.11646/zootaxa.4311.3.2, http://zenodo.org/record/847854