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Key to African Megastigmus species (Roques et al 2016)

(Life: Kingdom: Metazoa (animals); Phylum: Arthropoda; Class: Hexapoda; Order: Hymenoptera; Superfamily: Chalcidoidea; Family: TorymidaeSubfamily: Megastigminae; Genus: Megastigmus)

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1 Ovipositor sheaths shorter (0.40.9) than metasomal length 2

Ovipositor sheaths longer (1.1ז1.8) than metasomal length 5

2 Ovipositor sheaths much shorter (0.40.6) than metasomal length 3

Ovipositor sheaths 0.80.9 as long as metasomal length 4

3 Body colour nearly entirely orange-yellow; only a narrow black band along anterior suture of pronotum Megastigmus helinae Roques & Copeland, 2016

Body colour with a large longitudinal, median rufous band extending from pronotum to scutellum and parts of metasomal dark brown Megastigmus smithi Roques & Copeland, 2016

4 Pilosity on head entirely pale; pilosity on propodeum, coxa and legs entirely pale; body extensively orange except a few black patterns Megastigmus copelandi Roques & Copeland, 2016

Pilosity pale on face but dark on other parts of head; pilosity on propodeum, coxa and legs dark; body colour yellow and black Megastigmus ozoroae Roques & Copeland, 2016

5 Minute species, body length less than 1.5 mm; Thorax pilosity pale; 2 pairs of hairs on scutellum 6

Larger species, body length more than 2.5 mm; Thorax pilosity dark; from 3 to 8 pairs of hairs on scutellum 7

6 Body colour mostly black Megastigmus pretorianensis Doǧanlar, 2011

Body colour nearly completely orange-yellow Megastigmus icipeensis Roques & Copeland, 2016

7 Thorax colour orange or pale yellow without extensive dark markings 8

Thorax with extensive dark markings 12

8 Ovipositor sheaths less than 1.2 as long as metasomal length 9

Ovipositor sheaths at least 1.4 as long as metasomal length 10

9 Forewing with an elongate stigma, 1.7 as long as wide Megastigmus thomseni (Hussey, 1956)

Forewing with an oval- rounded stigma, 1.21.3 as long as wide Megastigmus pistaciae Walker, 1871

10 Ovipositor sheaths at least 1.8 as long as metasomal length and 0.8 as long as body length; forewing stigma oval, 1.5 as long as wide Megastigmus laventhali Roques & Copeland, 2016

Ovipositor sheaths at most 1.6 as long as metasomal length and 0.6 as long as body length; forewing stigma more elongate, at least 1.6 as long as wide 11

11 Forewing stigma oblong, 1.7 as long as wide, with a very short stigmal vein, at most 0.2 as long as stigma length; metasomal tergites pale yellow with translucent median longitudinal stripes, transversely infumate Megastigmus zebrinus Grissell, 2006

Forewing stigma elongate-oval, 2.0 as long as wide, with an elongate stigma vein, 0.4 as long as stigma length; metasomal tergites light orangish-brown with transverse dark brown bands Megastigmus transvaalensis (Hussey, 1956)

12 Ovipositor sheaths never longer than 1.5 metasomal length 13

Ovipositor sheaths at least 1.8 longer than metasomal length 15

13 Pronotum with a large median dark brown band progressively decreasing in size from the anterior to posterior suture; scutellum with 34 pairs of hairs; in seeds of Ozoroa Megastigmus hypogeus (Hussey, 1956)

Pronotum yellow or brownish, without median dark band; scutellum with 78 pairs of hairs; in seeds of Juniperus procera 14

14 Propodeum smooth; forewing stigma elongate, more than 2 as long as broad Megastigmus asir Ghramh & Shati

Propodeum rugose, with reticulate striae; forewing stigma oval, 1.5 as long as broad Megastigmus somaliensis Hussey, 1956

15 Ovipositor sheaths at least 1.2 longer than body length. In Rosa seeds Megastigmus aculeatus (Swederus, 1795)

Ovipositor sheaths never longer than body length. In Malvaceae or Anacardiaceae Seed 16

16 Pronotum orange with a conspicuous longitudinal black stripe on each side; in Malvaceae seeds Megastigmus grewianae Roques & Copeland, 2016

Pronotum without lateral black stripes but with a large, nearly rectangular dark brown band medially extending from anterior to posterior suture; in Anacardiaceae seeds Megastigmus lanneae Roques & Copeland, 2016

References

Roques A, Copeland RS, Soldati L, Denux O, Auger-Rozenberg M-A 2016. Megastigmus seed chalcids (Hymenoptera, Torymidae) radiated much more on Angiosperms than previously considered. I- Description of 8 new species from Kenya, with a key to the females of Eastern and Southern Africa. ZooKeys 585: 51124. doi: 10.3897/zookeys.585.7503

Credits

Photographs Simon van Noort (Iziko Museums of South Africa).


Web author Simon van Noort (Iziko South African Museum)

 

Citation: van Noort, S. 2021. WaspWeb: Hymenoptera of the Afrotropical region. URL: www.waspweb.org (accessed on <day/month/year>).

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