Syzeuctus FORSTER 1868
Creators: name: Riedel, Matthias
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Ichneumonidae
Syzeuctus

description: Key to the ♀♀ of the Oriental species of Syzeuctus FÖRSTER
adopted from CHANDRA & GUPTA (1977) and NIKAM & KANHEKAR (1987)
1 Metasomal spiracles strongly enlarged and specialized. Propodeum yellow, with long black mark below spiracle and a pair of submedian basal black marks. ............................... .............................................................................................................. claripennis group: 2
- Metasomal spiracles not enlarged and specialized. Propodeum various. ............................3
2 Specialized spiracles roundish, located on the 3 rd and following tergites. Fore and mid trochanters and femora blackish dorsally. Hind tarsus ochreous. India, Sri Lanka. .............. .......................................................................................... S. claripennis (CAMERON, 1902)
- Specialized spiracles elliptic and located on the 1 st to 4 th tergites. Fore and mid trochanters and femora entirely yellow. Hind tarsus blackish-brown. Philippines ................ ...................................................................................... S. macrospiracularis MOMOI, 1971
3 Metasoma reddish or red with black markings (fig. 2). Fore and mid femora often with black dorsal lines........................................................................................ villosus group: 4
- Metasoma black, apical margins and sometimes also basal bands yellow (figs 1, 3). Fore and mid femora usually without black lines, rarely mid femur black dorsally.............. ............................................................................................................... zanthorius group: 9
4 Apical transverse carina of propodeum complete................................................................5
- Apical transverse carina of propodeum medially or completely absent. .............................6
5 Ovipositor shorter than metasoma, 1.2× longer than hind tibia. Mesosoma covered with long setae. Fore and mid coxae and trochanters black; fore coxa and trochanter frontally yellow. Metasoma red; 1 st tergite apically and 2 nd tergite basally blackish. India ........................................................................................ S. villosus (CAMERON, 1899)
- Ovipositor longer than metasoma, 2.5× longer than hind tibia. Mesosoma covered with shorter setae. Fore and mid coxae and trochanters cream-yellow. Metasoma red; 1 st tergite yellow basally and apically (fig. 4). Indonesia: Sulawesi ........................................... ........................................................................................................... S. achterbergi nov.sp.
6 Ovipositor about as long as metasoma (fig. 2). Mesosoma entirely black. Coxae and trochanters black, fore coxa entirely and spot on mid coxa yellow. Basal tergites dark reddish (fig. 9). Thailand ....................................................................... S. siamensis nov.sp.
- Ovipositor distinctly longer than metasoma. Mesosoma with ± extended yellow coloration (figs 1, 3). Coxae and trochanters yellow, with black markings.........................7
7 4 th to 7 th tergites entirely red; 1 st to 3 rd tergites black, with apical yellow bands; 2 nd and 3 rd tergites reddish centrally (fig. 5). Flores. ...................................... S. floresiensis nov.sp.
- Metasoma red, all tergites apically and 1 st tergite basally yellowish. ..................................8
8 Mesoscutum, mesopleuron and propodeum entirely black. Vein 1cu-a interstitial. Body small and slender. India ..................................................... S. apicipennis (CAMERON, 1902)
- Mesoscutum black, with large median yellow spot confluent with antero-lateral yellow marks. Mesopleuron and propodeum largely yellow. Vein 1cu-a postfurcal. Body larger and stouter. Pakistan. ...................................... S. baluchistanensis (CAMERON, 1906)
9 Apical transverse carina of propodeum incomplete medially or absent. ...........................10
- Apical transverse carina of propodeum complete. Mesopleuron and propodeum entirely punctate.. ...........................................................................................................................12
10 Apical transverse carina of propodeum absent, indicated by an obtuse ridge. MI 1.0. Dorsal half of mesopleuron and dorso-median part of propodeum unsculptured. Fore wing not infuscate apically. Hind claw simple. Philippines. ................................................. .................................................................................................. S. torrevillasi MOMOI, 1971
- Apical transverse carina of propodeum present laterally, absent medially. MI 0.6-0.8. Propodeum and mesopleuron densely punctate. Fore wing ± infuscate apically. Hind claw sometimes pectinate..................................................................................................11
11 Ovipositor 1.25× longer than fore wing. Hind femur black, with narrow yellow apical band (fig. 1). Hind claw simple. Laos. ..................................................... S. laoticus nov.sp.
- Ovipositor 0.7-0.9× as long as fore wing. Hind femur red, ± yellowish medially. Hind claw with basal teeth. India. ...................................... S. indicus NIKAM & KANHEKAR, 1987
12 Ovipositor shorter than metasoma. Hind claw simple. Java. ................................................. .......................................................................................... S. incompletus SZÉPLIGETI, 1908
- Ovipositor at least as long as metasoma. Hind claw pectinate. .........................................13
13 Propodeum with distinct pleural carina. 2 nd and 3 rd tergites black medially, red or ochreous basally, yellowish apically. Flagellum with 44-48 flagellomeres.......................14
- Propodeum without pleural carina. 2 nd and 3 rd tergites black, yellow basally and/or apically. Flagellum with 27-48 flagellomeres. ..................................................................15
14 Clypeus smooth apically. Epicnemial carina ending near lower hind corner of pronotum. Speculum smooth. Fore wing with brown spot apically. 1 st tergite basally and apically yellow. Widespread in Oriental region.............................................................. ............................................................................ S. immedicatus CHANDRA & GUPTA, 1977
- Clypeus finely punctate. Epicnemial carina ending at center of mesopleuron. Speculum punctate. Fore wing hyaline, not distinctly infuscate apically. 1 st tergite subbasally with lateral cream-yellow marks and apical cream-yellow band. India ......................................... ............................................................................... S. nagzirae NIKAM & KANHEKAR, 1987
15 Ovipositor 1.7× longer than fore wing and 4.0× longer than hind tibia. All tergites smooth and shining, with small scattered punctures. 6 th to 8 th tergites without yellow apical margins. Hind coxa and trochanter entirely reddish. India .......................................... ........................................................................ S. leptopunctatus CHANDRA & GUPTA, 1977
- Ovipositor at most as long as fore wing. Hind coxa black, yellowish apically. Hind trochanter black. Tergites except 1 st tergite densely punctate, all tergites with yellow apical bands. .....................................................................................................................16
16 Malar space long, 1.0× as long as width of mandibular base (fig. 12). Flagellum with 42 flagellomeres. Hind femur yellow. 1 st tergite 1.6× longer than wide. Ovipositor 2.3× longer than hind tibia. Vietnam. ............................................................... S. genator nov.sp.
- Malar space shorter, 0.4-0.6× as long as width of mandibular base (as fig. 14). Flagellum with 37-40 flagellomeres. Hind femur red. 1 st tergite 1.7-2.3× longer than wide. Ovipositor 2.6-2.8× longer than hind tibia. India, Myanmar. ...................................... ............................................................................................ S. zanthorius (CAMERON, 1902)
description: Published as part of Riedel, Matthias, 2022, Contribution to the knowledge of Oriental Syzeuctus FÖRSTER (Hymenoptera, Ichneumonidae, Banchinae), with description of six new species, pp. 257-273 in Linzer biologische Beiträge 54 (1) on pages 271-272, DOI: 10.5281/zenodo.7507419