Quadrastichus

Prinsloo, Rd. L. & Kelly, Ne. A., 2009, The tetrastichine wasps (Hymenoptera: Chalcidoidea: Eulophidae) associated with galls on Erythrina species (Fabaceae) in South Africa, with the description of five new species, Zootaxa 2083 (1), pp. 27-45: 30

publication ID

http://doi.org/ 10.11646/zootaxa.2083.1.3

persistent identifier

http://treatment.plazi.org/id/03B96467-FFE5-FFEA-7B98-FE790CFDE8B9

treatment provided by

Felipe

scientific name

Quadrastichus
status

 

Key to the species of Quadrastichus   and Aprostocetus   associated with galls on Erythrina spp.   in South Africa (Males and females)

1. Antennal funicle three-segmented ( Figs. 7 View FIGURES 3– 9 , 14 View FIGURES 10–16 , 21 View FIGURES 17–23 , 27 View FIGURES 24–30 , 32 View FIGURES 31–38 )...................................................................Females……..2

- Funicle four-segmented ( Figs. 6 View FIGURES 3– 9 , 13 View FIGURES 10–16 , 20 View FIGURES 17–23 , 28 View FIGURES 24–30 , 33 View FIGURES 31–38 )................................................................................... Males……….7

2. Submarginal vein of forewing with 1 dorsal seta; mesosoma without a metallic lustre, either generally brown to black, or black with mesoscutal side lobes yellow in contrast; antenna with a single anellus ( Figs.7 View FIGURES 3– 9 , 14 View FIGURES 10–16 , 21 View FIGURES 17–23 ); Quadrastichus species   ......................................................................................................................................................... 3

- Submarginal vein with 2–4 dorsal setae or, if rarely with a single seta, then mesosoma black with a distinct dark green lustre; antenna with 4 anelli ( Figs. 27 View FIGURES 24–30 , 32 View FIGURES 31–38 ); Aprostocetus species   .. .................................................................... 5

3. Large, at least 3 mm in length; ovipositor protruding strongly by at least one-third length of gaster; mesosoma black with mesoscutal side lobes yellow in contrast; associated with Erythrina latissima   ........................... Q. ingens   sp. n.

- Smaller species, less than 2 mm in length; ovipositor not or only slightly protruded; colour of mesosoma different; associated with species of Erythrina   other than E. latissima   ........................................................................................ 4

4. Meso - and metasoma generally brown to blackish-brown with yellowish-brown suffusions; gaster somewhat circular in outline, hardly longer than wide; mesoscutum with 1 pair of adnotaular setae ( Fig. 10 View FIGURES 10–16 ) ....... Q. gallicola   sp. n.

- Meso – and metasoma black save basal half or so of gaster yellow; gaster elongate, tapering to an acute apex, about 1.5 X as long as broad; mesoscutum with 2–3 pairs of adnotaular setae ( Fig. 18 View FIGURES 17–23 ) ............................. Q. bardus   sp. n.

5. Last gastral tergite (epipygium) extremely long and slender, tail-like, distinctly longer than head and remainder of body combined ( Fig. 38 View FIGURES 31–38 ).................................................................................................................. A. exertus La Salle  

- Last gastral tergite short, triangular to conical in shape, distinctly shorter than remainder of gaster ( Figs. 29 View FIGURES 24–30 , 36 View FIGURES 31–38 ).... 6

6. Head and body without a metallic lustre, blackish-brown to almost black save base of gaster yellowish; mesoscutum with a row of 6–8 adnotaular setae on each side ( Fig. 25 View FIGURES 24–30 ); submarginal vein of forewing with 4 dorsal setae ............. ................................................................................................................................................................ A. tritus   sp. n.

- Head and body black with a distinct dark metallic green tinge, the base of gaster suffused with yellow; mesoscutum with 2–3 adnotaular setae on each side ( Fig. 34 View FIGURES 31–38 ); submarginal vein usually with 2 setae, rarely with 1 ....................... ................................................................................................................................................................ A. nitens   sp. n.

7. Submarginal vein of fore wing with 1 dorsal seta; body without a metallic lustre; species of Quadrastichus   ........... 8

- Submarginal vein with 2–4 setae or, if rarely with 1, then mesosoma black with a distinct metallic greenish tinge; species of Aprostocetus   ............................................................................................................................................... 10

8. Head and body generally brown to blackish-brown with certain areas unevenly suffused with yellowish-brown; mesoscutum with 1 adnotaular seta on each side.............................................................................. Q. gallicola   sp. n.

- Head and body distinctly bicolorous, with certain areas black, others white; mesoscutum with more than 1 adnotaular seta on each side.................................................................................................................................................. 9

9. Gaster dorsally entirely blackish; mesoscutum with a row of 3–5 adnotaular setae on each side ...... Q. ingens   sp. n.

- Gaster blackish with basal half or so white in contrast; mesoscutum with a row of 2–3 adnotaular setae .................... ............................................................................................................................................................. Q. bardus   sp. n.

10. Head and body non metallic, entirely blackish-brown save base of gaster suffused with yellowish-brown; legs with all coxae largely dusky; mesoscutum with a row of 6–8 adnotaular setae on each side; flagellar segments with whorls of long setae, as in Fig. 28 View FIGURES 24–30 . ......................................................................................................... A. tritus   sp. n.

- Head and body black with a metallic green tinge, the basal third or so of gaster white in contrast; coxae entirely white; mesoscutum with 2–4 adnotaular setae on each side; flagellar segments without whorls of long setae ( Fig. 33 View FIGURES 31–38 ) .................................................................................................................................................................................... 11

11. Antenna with 3 anelli ....................................................................................................................... A. exertus La Salle  

- Antenna with 2 anelli ............................................................................................................................ A. nitens   sp. n.