Trichogramma species

Querino, R. B. & R. A. Zucchi, 2005, An illustrated key to the species of Trichogramma (Hymenoptera: Trichogrammatidae) of Brazil, Zootaxa 1073 (1), pp. 37-60 : 39-43

Key to the Trichogramma species recorded in Brazil (males)

1. Antenna with flagellar segments separate, flagellum consisting of two distinct funicular and three claval segments, with a second funicular segment subquadrate, only slightly longer than wide (fig. 3a); marginal vein of forewing with a seta near posterior border (fig. 3b); hind wing without a posterior vein track (subgenus Vanlisus ) (fig. 3c); male genitalia with posterior extension of dorsal lamina with a rounded apex (fig. 3d) (Figures based on Pinto, 1992, 1999) ....... T. atropos Pinto

FIGURE 3.

1’. Antenna with flagellar segments joined, forming a single structure (fig. 4a); marginal vein of forewing without a setae near posterior border and with three robust and long setae on the dorsal surface (fig. 4b); hind wing with at least a short posterior tracks (fig. 4c); male genitalia with posterior extension variable (subgenus Trichogramma ) ...................................................................................................... 2

FIGURE 4.

2(1’). Dorsal lamina without lateral lobes ....................................................................... 3

2’. Dorsal lamina with lateral lobes extending laterally beyond margin of genital capsule (fig. 5a); intervolsellar process short, distinctly notched at apex (fig. 5b) [commonly associated with Erinnyis ello ( Lepidoptera , Sphingidae ) in cassava] ... ................................................................. T. manicobai Brun, Moraes & Soares

FIGURE 5.

3(2). Dorsal lamina broad, not narrowing appreciably from base to apex (fig. 6a); dorsal ridge present (fig. 6b) ............................................................................................ 4

FIGURE 6.

3’. Dorsal lamina not so broad or narrowing gradually from base to apex or the basal wider than apex (fig. 7a); dorsal ridge absent ....................................................... 6

FIGURE 7.

4(3). Parameres arcuate (fig. 8a); volsellae curved (fig. 8b); genital capsule broad (width greater than 0.6 genital capsule length) ..................................................... 5

FIGURE 8.

4’. Parameres not arcuate (fig. 9a); genital capsule small (width less than 0.6 genital capsule length); volsellae not modified (fig. 9b); intervolsellar process minute (fig. 9c) ( Plate 1a ) ................................................ T. pusillum Querino & Zucchi

FIGURE 9.

5(4). Volsellae with a strong constriction apically, broadly bulging laterally (fig. 10a); parameres arcuate (fig. 10b); intervolsellar process very short (fig. 10c); ventral processes distinctly tubular(fig. 10d) ( Plate 5a , 8a ) ................................................. ......................................................................... T. atopovirilia Oatman & Platner

FIGURE 10.

5’. Volsellae without an apical constriction, curved with pointed apex and spine long, narrow and straight (fig. 11a); parameres arcuate (fig. 11b); intervolsellar process absent or obsolescent (fig. 11c). ( Plate 5b , 8b ) ...................................................... ....................................................................... T. acacioi Brun, Moraes & Soares

FIGURE 11.

6(3’). Dorsal lamina long and narrow and posterior extension with apex rounded or just slightly and usually extending beyond volsellae (aspect linguiform) (fig. 12a) ... 7

FIGURE 12.

6’. Dorsal lamina long or short, narrowing gradually from base to apex (fig. 13a) or divided more or less into two portions, a wider basal section and a narrower apical section (fig. 13b); posterior extension with apex pointed or slightly rounded, extending beyond volsellae or not ......................................................................... 9

FIGURE 13.

7(6). Posterior extension of dorsal lamina very narrow (fig. 14a), its width near apex is distinctly less than that of aedeagus ( Plate 5c ).... T. pratissolii Querino & Zucchi

FIGURE 14.

7’. Dorsal lamina with posterior extension narrow, its width near apex is approximately the same as width of aedeagus (tongue­like)............................................. 8

8(7’). Dorsal lamina with posterior extension distinctly narrow and long, extending beyond volsellae (fig. 15a); intervolsellar process short and pointed (fig. 15b) ( Plate 1b )................................................................................... T. zucchii Querino

Figures

PLATE 1. Male genital capsule: a—Trichogramma pusillum; b—Trichogramma zucchii; c ­ Trichogramma parrai (1­ventral; 2­ dorsal; scale 10 mm).

PLATE 5. Male genital capsule: a—Trichogramma atopovirilia (1—ventral: 1680x, 10m; 2—dorsal: 1730x, 10m); b—Trichogramma acacioi (ventral—800x, 20m; dorsal—750x, 20m); c—Trichogramma pratissolii (ventral—1460x, 10m; dorsal—1460x, 10 m); d ­Trichogramma rojasi (ventral—800x, 20m; dorsal—900x, 20 m).

PLATE 8. Details of apex of genital capsule: a­Trichogramma atopovirilia (2500x, 5m); b­ Trichogramma acacioi (1300x, 10m); c­Trichogramma rojasi (2400x, 5m); d­Trichogramma esalqueanum (4440x, 3 m); e­Trichogramma lasallei (1750x, 10m); f­Trichogramma pretiosum (3m; 4450x); g­Trichogramma exiguum (pointed apex—3000x, 5m; truncate apex —3000x, 5m); h­Trichogramma galloi (5060x, 3 m).