Oligosita Walker

Begum, Salma, Anis, Shoeba Binte & Khan, Mohd Talib, 2015, A revision of the Indian species of Oligosita Walker (Hymenoptera: Trichogrammatidae), Zootaxa 3973 (3), pp. 401-424 : 402

Oligosita Walker

Oligosita (Haliday MS) Walker, 1851: 213. Type species Oligosita collina Walker , by monotypy. Westwoodella Ashmead, 1904: 359 . Type species Oligosita subfasciata Westwood , by monotypy and original designation. Paroligosita Kurdjumov, 1911: 434 . Type species Paroligosita bella Kurdjumov , by original designation. Orioligosita Hayat, 2009: 214. Type species Oligosita (Orioligosita) similiana Hayat , by original designation (as subgenus of

Oligosita ).

Diagnosis. Female. Body colour variable, from yellow to brown, rarely red. Antennal segments variable, from pale yellow to pale brown to dark brown. Wings generally hyaline, rarely with infuscate spots below stigmal and premarginal veins. Legs usually pale yellow to pale brown, last segment of tarsi pale yellow to pale brown to dark brown. Antennal formula, 1113; one anellus present between pedicel and funicle segment; apex of clava with or without a prominent rod-like or drumstick-like projection. Maxillary palp present, unsegmented. Mandible with 2 or 3 teeth. Mesosoma with pronotum undivided or medially membranous, consisting of two plates; mid lobe of mesoscutum rarely without but usually with 2 setae; scutellum with 2 setae; propodeum medially with a small subtriangular lobe. Fore wing with apex narrowed or rounded; disc with a few to many setae, either arranged in lines or irregularly distributed; marginal fringe usually long; marginal vein long and stigmal vein well developed. Metasoma usually longer than mesosoma; ovipositor length variable, either hidden or exserted.

Male. Male genitalia without digiti and denticles ( Yousuf & Shafee, 1988: fig. 30F; Viggiani, 1971: fig. X. 2)

Hosts. Hemiptera : primarily Cicadellidae ( Noyes 2014) .

Species. World, 93; 16 species from India (including the new species described here).

Distribution. Cosmopolitan.

Comments. Pinto & Viggiani (2004) divided the tribe Oligositini into two subtribes, Oligositina and Eteroligositina, based on a phylogenetic analysis employing morphological characters. They removed Pseudoligosita Girault from synonymy under Oligosita , and placed it in Eteroligositina. They also transferred several species earlier described in Oligosita to Pseudoligosita . The subtribe Oligositina contains five genera, viz. Epoligosita Girault , Megaphragma Timberlake , Oligosita , Prestwichia Lubbock , and Prosoligosita Hayat & Husain. Pinto & Viggiani (2004) divided Oligosita into 3 broad groups—Collina group ( Oligosita -C), Minima group ( Oligosita -M) and a generalized group ( Oligosita -G). They considered Oligosita -C monophyletic, based on a clavate antenna in female, the apical placoid sensillum forming a terminal process on the clava ( Fig. 23 ); and a distinctly triangular propodeal disk ( Pinto 2004: fig. 27). The Oligosita -M group was identified by the arcuate retinacular margin of the fore wing, the presence of a single campaniform sensillum at the apex of the premarginal vein and absence of an apical premarginal seta. The generalized group, Oligosita -G, is a heterogeneous assemblage without well-defined features.

Oligosita is similar to Prosoligosita except for the presence of a distinct funicle segment and a 3-segmented clava. Prosoligosita is characterized by the absence of funicle and presence of a 4-segmented clava ( Hayat & Husain 1981).

Figures

FIGURES 23 – 25. Oligosita meerutensis Yousuf & Shafee, female: 23, antenna, Uttarakhand specimen; 24, fore wing, Uttarakhand specimen; 25, pronotum divided, Uttarakhand specimen.