Trichogramma acuminatum Querino & Zucchi, 2003

Querino, R. B. & Zucchi, R. A., 2003, Six new species of Trichogramma Westwood (Hymenoptera: Trichogrammatidae) from a Brazilian forest reserve, Zootaxa 134 (1), pp. 1-11 : 2-5

Trichogramma acuminatum Querino & Zucchi , new species ( Figures 1a , 2a )

Antenna: flagellum long (0.15­0.17); ratio of the length to width of flagellum (6.73­8.30); flagellum length to hind tibial length (1.06­1.14); flagelliform setae long (0.08), evenly tapering to apex; longest flagelliform setae length to flagellum width (3.82­4.00); basiconic sensilla ovaliform, with formula 2­2­2­0­1­1; three placoid sensilla, the basal one 0.04. Forewing: width to length ratio of forewing (0.51­0.52); fringe setae length (0.04); fringe setae length to hind tibial length (0.25­0.29); fringe setae length to forewing width (0.15); 8­10 setae between the 4 th and 5 th setal tracks. Hind wings: anterior track absent; posterior track with 4­6 setae, reaching the mid­point of the middle track. Scutellum: anterior setae short and fine; ratio of anterior to posterior pair (0.11­0.14). Male genitalia: genital capsule longer (0.12) than wide (0.04); ratio of the width to length of genital capsule (0.32­0.34); apical distance to genital capsule length (0.24­0.25); apical width to genital capsule width (0.70­0.79); dorsal lamina originating anterior to middle of genital capsule without basal notching; dorsal lamina gradually tapers from base to apex; posterior extension of the dorsal lamina length (0.03­0.04); dorsal lamina length to dorsal lamina width (1.35­1.59); dorsal lamina length to genital capsule length (0.39­0.47); dorsal aperture length to dorsal lamina length (1.15­1.43); posterior extension of the dorsal lamina length to dorsal lamina length (0.67­0.74); dorsal ridge absent; ventral ridge indistinct, reaching the middle of the genital capsule (0.03­0.04); ventral ridge length to basal distance (0.34­0.43); basal distance to genital capsule length (0.75­0.76); ventral processes near base of intervolsellar process; intervolsellar process elongate, reaching half of the length of volsellae (0.008). Quantitative data were obtained from two males.

TYPE MATERIAL ­ Holotype male. BRASIL. SÃO PAULO. Piracicaba, Tupi (forest reserve), suction trap, R.B. Querino collr. ( ESALQ). One paratype (male) with same data as holotype ( UCR).

DIAGNOSIS ­ The triangular aspect of the dorsal lamina, without basal notching, posterior extension with a pointed apex and intervolsellar processes elongate reaching the half of the length of volsellae allow recognition of Trichogramma acuminatum . These characters separate T. acuminatum from other South American species, but it can be confused with T. tupiense . However, T. acuminatum differs from T. tupiense by having more elongate intervolsellar process and placement of the ventral processes close to the base of the intervolsellar process. In T. tupiense , the intervolsellar is relatively short and placement of the distinct ventral processes at or very near the base of the intervolsellar process.

ETYMOLOGY ­ The scientific name is a Latin adjective acuminatum for sharp, in reference to the pointed apex of the dorsal lamina of the male genitalia.

Figures

FIGURE 1. Male genital capsule: a­Trichogramma acuminatum n. sp.; b­Trichogramma alloeovirilia n. sp.; c­Trichogramma parrai n. sp.; d­Trichogramma pusillum n. sp.; e­Trichogramma tupiense n. sp.; f­Trichogramma zucchii n. sp. (1­ventral; 2­ dorsal; scale 20 m).

FIGURE 2. Male genital capsule: a­Trichogramma acuminatum n. sp.; b­Trichogramma alloeovirilia n. sp.; c­Trichogramma parrai n. sp.; d­Trichogramma pusillum n. sp.; e­Trichogramma tupiense; n. sp. f­Trichogramma zucchii n. sp. (1­ventral; 2­ dorsal; scale 10 m).