Gastrozona nigrifemur, David, K. J. & Hancock, D. L., 2017

David, K. J. & Hancock, D. L., 2017, A new species of Gastrozona Bezzi (Diptera: Tephritidae: Dacinae: Gastrozonini) with an updated key to species from India, Zootaxa 4216 (1), pp. 55-64 : 56-58

Gastrozona nigrifemur sp. nov.

( Figures 1 ̄17)

Diagnosis. Small to medium sized (4.3̄6.0 mm), predominantly black species ( Fig. 1), scutum black without yellow lateral postsutural vittae in females, with narrow lateral postsutural vittae in males; scutellum broadly black medially; wing with broad radial-medial band fused with anterior apical band; anterior apical band without a broad triangular hyaline indentation from vein R4+5; posterior apical band narrowly or indistinctly fused with anterior apical band; legs with fuscous apical markings on hind femora in both sexes. Aculeus without lateral serrated margin, trilobed with preapical steps.

Description (holotype female). Head ( Fig. 2 ), 1.54 mm high, 1.18 mm long; 1.74 mm wide; frons 1.45 times longer than wide, fulvous with a medial fuscous band as wide as ocellar triangle and extending from vertex to frontal lunule; 3 frontal setae, 2 orbital setae, 1 ocellar, 1 postocellar, 1 medial and 1 lateral vertical seta. Occiput light fuscous above and fulvous below, with 5̄6 thick postocular setae. Parafacial fulvous, gena light fuscous with well developed genal seta and 6¯8 subvibrissal setae, postgena fulvous with numerous postgenal setae; face fulvous without dark markings. Antenna shorter than face, scape (0.12 mm) and pedicel (0.07 mm) fulvous, first flagellomere (0.36 mm) light fuscous, not dorsoapically pointed; arista plumose, rays as wide as first flagellomere. Thorax: 2.65 mm long, 1.94 mm wide. Scutum ( Fig. 3 ) predominantly black except for red-brown dorsocentral band extending from scapular seta to dorsocentral seta, curved dorsocentral fulvous vitta from the base of dorsocentral seta to intra-alar seta and presutural fulvous vitta from postpronotal lobe to notopleuron. Pleura black, anepisternum black except for a broad anepisternal stripe reaching postpronotal lobe, with two setae posterior to phragma; anepimeron and katepisternum black, each with single seta; 2/3 of anatergite and katatergite fulvous, remainder black. Chaetotaxy: 2 scapular, 1 postpronotal, 1+1 notopleural, 1 presutural supra-alar, 1 postsutural supra-alar, 1 dorsocentral, 1 postalar, 1 intra-alar, 1 prescutellar acrostichal seta. Scutellum yellow with medial black subrectangular spot and two scutellar setae, subscutellum and mediotergite black. Legs ( Fig. 4 ): Coxa and trochanter fulvous. Forefemur fulvous with stout dorsal and ventral spines, 0.7 of mid and hindfemur with fuscous markings. Tibiae fulvous, mid tibia with stout ventral spine. Tarsal segments fulvous. Wing ( Fig. 6 ): 5.68 mm long, with banded pattern. Humeral band and subcostal band fused, radial-medial band fused with anterior apical band, subapical band not joining anterior apical band, posterior apical band weakly connected with anterior apical band. Veins R1 and R4+5 setulose dorsally, crossvein r-m placed beyond the middle of cell dm. Abdomen ( Figs 4, 5 ): 2.60 mm long and 2.40 mm wide, tergites I and II fulvous, tergite III black except for a fulvous line basally, tergites IV and V dark fuscous basally and fulvous apically, tergite VI fulvous with lateral black patches, sternites IV̄VI with elongate anterior apodemes.

Female genitalia: Oviscape black, 1.56 mm long, taeniae elongate (1.18 mm), eversible membrane (1.63 mm long) ( Fig. 7 ) with spicules at proximal end, well sclerotised with single conical projections ( Fig. 8 ) whereas spicules at distal end of eversible membrane with 6̄7 sharp projections ( Fig. 9 ), medial one higher than lateral ones; aculeus (1.90 mm long) tip trilobed with preapical steps and lateral margins even, without serrations ( Fig. 10 ), sternite as in figure 10. Two black, club-shaped spermathecae with apical papillae ( Fig.11 ).

Male: Similar to female except for the presence of a narrow yellow, lateral postsutural vitta and absence of extensive fuscous markings on midfemur. Epandrium sclerotised, with well developed black, cap-like proctiger larger than epandrium ( Fig. 12 ), lateral surstylus narrow with posterior lobe longer than anterior, medial surstylus shorter than lateral surstylus with thick prensisetae. Epandrium and surstyli bulb-shaped in posterior view ( Fig. 13 ). Phallus (2.2 mm long) with sclerotised glans of phallus, acrophallus with two semitubular lobes, preaputium smooth without sculpturing, subapical lobe hook shaped, preglans lobe absent ( Figs 14, 15 ). Hypandrium Cshaped, phallapodeme broadened posteriorly, with vanes fused with lateral sclerite ( Figs 16, 17 ).

Host. Dendrocalamus strictus (Roxb.) . Nees ( Poaceae ).

Material examined. Holotype ♀, INDIA, Karnataka, Kunigal , 18.ix.2016, David, K. J. and Prabhu, G. ; Paratypes: 2♀, same data as of holotype ; 9♀, 13♂, INDIA, Karnataka, Chikkaballapur, Kaiwara , 03.ix.2014, David K. J. and Prabhu, G. ; 1♀, same data except date 09.x.2014. ( NBAIR).

Remarks. Gastrozona nigrifemur is similar to G. fasciventris and G. soror in general body colouration and wing pattern. It can be distinguished from G. fasciventris by having the anterior apical band confluent with vein R4+5 throughout its length and the posterior apical band not distinctly fused with the anterior apical band plus, in the male, the fuscous apex of the hindfemur and, in the female, absence of the lateral postsutural yellow vittae and having aculeus margin even. G. soror differs by wing pattern with the posterior apical band directed anteriorly towards the subapical band.

Figures

FIGURES 2 – 6. Gastrozona nigrifemur sp. nov. 2, head (profile); 3, scutum (dorsal view); 4, thorax (lateral view) and legs; 5, abdomen; 6, wing.

FIGURES 7 – 11. Female genitalia of Gastrozona nigrifemur sp. nov. 7, ovipositor; 8, spicules on proximal end of eversible membrane; 9, spicules on distal end of eversible membrane; 10, aculeus tip and sternite 8; 11, spermatheca.

FIGURES 12 – 17. Male genitalia of Gastrozona nigrifemur sp. nov. 12, epandrium, surstyli and proctiger (lateral view); 13, epandrium and surstyli; 14, glans of phallus (lateral view); 15, glans of phallus (dorsal view); 16, hypandrium, phallapodeme and lateral sclerite (posterior view); 17, hypandrium, phallapodeme and lateral sclerite (lateral view)