Cyrtosia trivitta, Hakimian & Nozari & Gharali & Evenhuis, 2018

Hakimian, Saeedeh, Nozari, Jamasb, Gharali, Babak & Evenhuis, Neal, 2018, A study of the genus Cyrtosia Perris (Diptera: Mythicomyiidae: Platypyginae) in Yazd province, Iran, with description of a new species, Zootaxa 4387 (1), pp. 195-200 : 196-199

Cyrtosia trivitta sp. nov.

Material examined. Holotype. Male, Iran, Yazd Province, Ashkezar , Shorbolein , 31˚49'8.33" N, 54˚01' 32.78" E, 1813m, pan trap, 7.v.2015, leg. S. Hakimian (dried by brown’s method) ( HMIM) ; 1♂ (genitalia dissected) and 1♀, Iran, Yazd Province, Taft city, Aliabad , 31˚39'54.02" N, 53˚48' 19.95" E, 2425m, pan trap, 7.v.2015, leg. S. Hakimian (BG) ; 1♂ and 1♀, Iran, Yazd Province, Ashkezar, Tagavieh , 31˚50'50,31" N, 54˚01'37,92" E, 1610 m, 7.v. 2015, leg. S. Hakimian ( BPBM).

Diagnosis. Frons completely yellow; mesonotum with three black stripes; halter completely yellow; scutellum completely yellow; epandrium with single apicolateral process; gonocoxites fused medially with sclerotized, black, Ч-shaped processes.

Description. Holotype male ( Fig. 1). Lengths. Body: 2.03 mm; Wing: 2.01 mm. Head ( Fig. 2c ). Subglobular; eyes dichoptic, width at vertex 1.5 times distance between lateral ocelli; occiput and vertex black; ocellar triangle black; frons slightly depressed medially, completely yellow ( Fig. 2c ); face and oral margin yellow; antennae brown, scape minute, pedicel cylindrical, slightly longer than wide, first flagellomere cylindrical, length about four times greatest width, second flagellomere cylindrical, length 0.4 times of first flagellomere, with minute apical style; proboscis yellow; length slightly shorter (0.8 times) than head length, labrum medially brown, sclerotized, stiff, pointed apically, shorter than proboscis in length ( Fig. 2c ). Thorax. Pronotum black; mesonotum yellow ( Fig. 2a, d ), with three black stripes, median stripe reaching to anterior margin, ending much before than scutellum, leaving prescutellar area yellow; lateral margin of mesonotum completely yellow; postpronotal lobe and postalar callus yellow; scutellum yellow ( Fig. 2d ); pleura ( Figs. 2b ) yellow except black on following: small spots at anterior half on anepisternum, lower half of katepisternum and lower margin of anepimeron; halter stem and knob yellowish white. Legs ( Fig. 1) completely yellow; claws black. Wing ( Fig. 2e ). Hyaline, Sc, Rs basally, vein separating basal cells and anal vein white to translucent; costal, radial, and medial veins brown; costa ends slightly beyond end of R4+5; vein Sc incomplete, ending at level about equal to origin of vein R2+3; vein R2+3 end in wing margin equidistance from vein R1 and R4+5, apically curved; vein R4+5 thicker than other veins, curved; cell dm open, without crossvein closing it apically; vein M1+2 shorter than length of fork point to margin of wing; length of cell br about 1.5 times that of cell bm, anal cell narrowly open at wing margin, width subequal to r-m crossvein; fringe of hair on posterior margin of wing minute. Abdomen ( Fig. 1). Tergites anteriorly brown, posteriorly yellow; sternites almost all yellow. Male genitalia. Epandrium ( Fig. 3a, b ) subquadrate in dorsal view, apicolaterally with short process, cercus linearly sclerotized; gonocoxites ( Figs. 3b, c ) fused medially, subquadrate in ventral view, medioventrally with Ч-shaped processes ( Fig. 3b ), gonostyli small, triangular ( Fig. 3c, d ); lateral aedeagal apodemes subquadrate, aedeagal bulb narrow, much narrowing as very long aedeagus; ejoculatory apodeme extended beyond end of aedeagal bulb.

Female. Similar to male but larger.

Female genitalia. Not dissected

Etymology. The name of the new species, trivitta , is composed of two Latin words: tri [= three] + vitta [stripe] and refers to three black stripes on the mesonotum.

Distribution. Cyrtosia trivitta sp. nov. is currently known only from Yazd province in the centre of Iran.

Figures

FIGURE 2. Cyrtosia trivitta sp. nov., a. mesonotum (anterior view); b. pleura; c. head (laterodorsal view); d. mesonotum (dorsal view); e. wing

FIGURE 3. Cyrtosia trivitta sp. nov., male genitalia: a. epandrium (ventral view); b. epandrium (dorsal view); c. male genitalia without epandrium (dorsal view); d. male genitalia without epandrium (ventral view)