Syzeuctus Forster 1869
Creators: name: Heydari, Maryam Zardouei
name: Riedel, Matthias
name: Rakhshani, Ehsan
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Ichneumonidae
Syzeuctus

description: Genus Syzeuctus Förster, 1869
Type species: Ichneumon maculatorius Fabricius, 1787.
Syzeuctus Förster, 1869: 167. Type species— Ichneumon maculatorius Fabricius, 1787
Diceratops Förster, 1869: 167. Type species— Pimpla bicornis Gravenhorst, 1829
Meyva Cameron, 1899: 191. Type species— Meyva villosa Cameron, 1899.
Rhynchotrevoria Cameron, 1906: 125. Type species— Rhynchotrevoria rostrata Cameron, 1906
Ephialtina Szépligeti, 1908: 74. Type species— Ephialtina apicalis Szépligeti, 1908.
Leptoglyphis Brèthes, 1927: 319. Type species— Leptoglyphis minasensis Brèthes, 1927.
Paratanera Rao, 1953: 171. Type species— Paratanera indica Rao, 1953.
Diagnosis. Syzeuctus species can be differentiated from other genera of the tribe Atrophini by the combination of the following morphological features: genal carina usually reaching the base of mandible; epomia distinctly developed; propodeum without lateral longitudinal carina (Brock 2017), small and triangular areolet with a long frontal stalk, fore wing vein 2m-cu reclivous, with one bulla, sometimes tergal spiracles distinctly enlarged (Townes 1970).
Distribution. This is a large worldwide genus, its members usually adapted to relatively dry habitats (Townes 1970).
Key to the females of the Iranian species of Syzeuctus Förster, 1869
1. Fore wing vein 1cu-a interstitial; body mostly pale yellow, head shiny yellow, thorax pale yellow, metasomal tergites with a narrow pale yellow band on posterior margins; eyes slightly divergent in lower part........................................................................................... Syzeuctus flavocephalus Zardouei & Riedel sp. nov.
- Fore wing vein 1cu-a postfurcal; body with extensive dark patches, at most head and thorax yellow and metasomal tergites with a narrow yellow band on posterior margins; eyes parallel or slightly convergent in lower part......................... 2
2. The posterior transverse carina of propodeum complete....................................................... 3
- The posterior transverse carina of propodeum absents or shortly developed, laterally................................ 5
3. POL 1.5× OD; face mainly yellow; first to third metasomal tergites red with a narrow yellow band on posterior margins, the following tergites more brownish....................................... Syzeuctus brunneomaculatus Riedel, 2021
- POL 2.1× OD; face mainly black; first to fourth metasomal tergites black with a narrow yellow band on posterior margins... ................................................................................................... 4
4. Frons strongly swollen laterally; malar space about 0.5–0.6× as long as basal width of mandible; fore wing with apical brown spot; eyes slightly convergent in lower part; hind femur mostly black, yellow in apical 0.2; first to fourth metasomal tergites black with wide apical yellow bands........................................... Syzeuctus bicolor Szépligeti, 1899
- Frons slightly swollen laterally; Malar space about 0.6–0.8× as long as basal width of mandible; fore wing with subapical brown spot; eyes parallel in lower part; hind femur usually reddish; first to third metasomal tergites red, sometimes first to fourth metasomal tergites with apical yellow bands........................... Syzeuctus maculipennis (Costa, 1883)
5. Face mainly black, at most clypeus and orbits yellow......................................................... 6
- Face entirely ivory or mainly yellow; at most black medially................................................... 7
6. Temple narrowed behind eye (0.45× as long as eye); clypeus 1.5× wider than long; first metasomal tergite stout (1.2–1.5× longer than wide); ovipositor 0.8–1.1× as long as fore wing; first metasomal tergite black with subbasal and apical yellow bands......................................................................... Syzeuctus irrisorius (Rossi, 1794)
- Temple strongly narrowed behind eye (0.3× as long as eye); clypeus 1.8× wider than long; first metasomal tergite slender (1.9–2.0× longer than wide); ovipositor 1.2–1.4× as long as fore wing; first metasomal tergite black with wide apical yellow band.................................................................. Syzeuctus paraturcator Riedel, 2021
7. Face entirely ivory; OOL shorter than 1.7× (0.9–1.4) OD; clypeus 1.8× wider than long.... Syzeuctus persicus Riedel, 2021
- Face mainly yellow; OOL about 1.7× OD; clypeus 1.5–1.7× wider than long...................................... 8
8. Lateral ocellus large, OD as long OOL; temple narrowed behind eye (0.45× as long as eye); fore wing usually with a distinct dark spot apically........................................................ Syzeuctus kasparyator Aubert, 1977
- Lateral ocellus small, OD shorter than OOL; temple strongly narrowed behind eye (0.3× as long as eye); fore wing with a weak dark spot apically..................................................................................... 9
9. Posterior transversal carina of propodeum widely present laterally, obsolete medially; OOL about 1.1× OD; thorax mainly yellow, with extended black coloration; fifth to seventh metasomal tergites red....... Syzeuctus pseudoceballosi Riedel, 2021
- Posterior transversal carina of propodeum entirely absent or shortly present laterally and absent medially; OOL about 1.4× OD; thorax black, with extended yellow coloration; fifth to seventh metasomal tergites black, sometimes laterally red................................................................................... Syzeuctus turcator Aubert, 1984
description: Published as part of Heydari, Maryam Zardouei, Riedel, Matthias & Rakhshani, Ehsan, 2022, Review of Syzeuctus Förster, 1869 (Hymenoptera: Ichneumonidae: Banchinae) in Iran, with description of a new species, pp. 259-268 in Zootaxa 5100 (2) on pages 260-261, DOI: 10.11646/zootaxa.5100.2.5, http://zenodo.org/record/6145741