Trichogramma pusillum 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 : 7-8

Trichogramma pusillum Querino & Zucchi , new species ( Figures 1d , 2d )

Antenna: flagellum long (0.17); ratio of the length to width of flagellum (7.08­7.55); flagellum length to hind tibial length (1.11­1.13); unsocketed setae absent; flagelliform setae long (0.06­0.07), evenly tapering to apex; longest flagelliform setae length to flagellum width (2.63­3.00); basiconic sensilla with formula 2­2­2­1­1­1; three placoid sensilla, the basal one 0.05. Forewing: width to length ratio of the forewing (0.55); fringe setae short (0.03 ­ N=1); fringe setae length to hind tibial length (0.17 ­ N=1); fringe setae length to forewing width (0.10 ­ N=1); 7­8 setae between the 4 th and 5 th setal tracks. Hind wings: anterior track absent; posterior track with 4 setae reaching the mid­point of the middle track. Scutellum: anterior setae short; ratio of anterior to posterior setae (0.06 ­ N=1). Male genitalia: genital capsule small (0.09­0.11) and wide (0.04­0.05); ratio of the width to length of the genital capsule (0.46­0.51); apical distance to genital capsule length (0.29­ 0.35); apical width to genital capsule width (0.62­0.68); dorsal lamina short (0.04) and wide (0.03­0.04); dorsal lamina length to dorsal lamina width (1.17­1.24); dorsal lamina length to genital capsule length (0.38­0.49); posterior extension of the dorsal lamina short (0.03) with apex rounded or slight pointed at level of volsellae; posterior extension of the dorsal lamina length to dorsal lamina length (0.67­0.76); dorsal aperture length to dorsal lamina length (1.52­1.57); dorsal ridge present; ventral ridge difficult to discern under light microscope; basal distance to genital capsule length (0.88­0.71); ventral processes anterior to the base of the intervolsellar process; intervolsellar process minute. 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 ­ Trichogramma pusillum is characterized mainly by the small genital capsule; the dorsal lamina with a wide posterior extension and the obsolescent intervolsellar process. T. pusillum is similar to T. bennetti , a species that occurs in Colombia (John D. Pinto, pers. com.). Both species have a broad genital capsule, wider in anterior half and a wide dorsal lamina, which is abruptly narrowed immediately at its base, with a posterior extension conceals most of the volsellae but not the parameres. However, T. pusillum has shorter intervolsellar process, shorter flagelliform setae, unmodified volsellae and a narrower genital capsule. In T. bennetti , the intervolsellar process is longer, flagelliform setae are long, the volsellae are modified, lobate, constricted apically and have a gibbose apical projection at the base of spine ( Pinto, 1999).

ETYMOLOGY ­ The scientific name is a Latin adjective, which means very little and refers to the minute intervolsellar process 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).