Hemerodromia cercusdilatata, Câmara, J. T., Plant, A. R. & Rafael, J. A., 2014

Câmara, J. T., Plant, A. R. & Rafael, J. A., 2014, Neotropical Hemerodromia Meigen (Diptera: Empididae), a world of discovery I: new generic record and new species from Brazilian Amazon Basin, Zootaxa 3893 (2), pp. 209-231 : 214-216

Hemerodromia cercusdilatata sp. nov.

( Figs 16–24 )

Diagnosis. External characters as in H. amazonensis sp. nov. Cercus greatly enlarged, with bluntly pointed apical process incurved with serrate posteroapical margin ( Fig. 20 ); epandrium rather inflated basally, narrower and somewhat hook-shaped distally ( Fig. 20 ); subepandrial sclerite with two posterior finger-like processes ( Fig. 22 ); hypandrium membranous ( Fig. 20 ).

Description. Male ( Fig. 16 ). Head. Dark brown to black, antenna and mouthparts yellow with all setae whitish; ocellar triangle with 1 pair of proclinate setae; anterior ocellus larger. Eyes iridescent black, very narrowly separated on face bearing fine reclinate setulae. Frons with 1–2 setulae; occiput bearing scattered fine hairs. Clypeus with rather dense short downwardly directed pile. Proboscis slightly curved with yellow setae. Antenna with scape and pedicel bearing distinct short dorsal setulae; postpedicel about 1.5X as long as wide, stylus ~ 0.9X as long as postpedicel. Thorax ( Fig. 16 ). Elongate, slightly arched ventrally; thoracic dorsum yellow, brownish on prothoracic collar, narrowly behind postpronotal lobe, on scutum posterolaterally above wing base, suture between katepisternum and meron and on katepisternum ventrally behind C1; antepronotum with anterior margin almost straight; scutum with setae yellow, very small and fine except one notopleural. Legs ( Fig. 16 ). Whitish yellow. C1 ~ 1.2X longer than distance between C1 and C2, 5X as long as wide with a few pale dorsoapical setae. F1 ~ 1.2X as long as C1, 3.5–4.0X as long as wide. Femoral formula 7/ 19/17/7; denticles confined to distal 0.8, becoming closer together distally, black, 2 rows linear, parallel, without distal discontinuity ( Fig. 18 ). T1 ~ 0.7X as long as F1, evenly curved, ventral face shallowly concave; with 2 rows of 15–17 sharply pointed spinose setae ventrally; dorsal ciliation of decumbent short pale setulae, denser distally; without apicoventral extension on T1 but with strong apical spine ( Fig. 18 ). Mid and hind legs slender with only fine setae but T3 with ‘comb’ of short setae posteroapically. Wing ( Fig. 17 ). Membrane slightly yellow, veins yellowish; R2+3 long and straight, not strongly curved towards C apically, joining C ~ 0.7–0.8 distance between end of R1 and R4; R4+5 fork acute (~ 60°), distal to position of M1+2 fork by about same length as R4; R5 and M1 convergent distally, diverging slightly at extreme apex; vein R5 ~ 2X as long as R4; cell bm+dm short, ending at level of R1, ~ 2X as long as cell br. Halter whitish yellow. Abdomen ( Figs 16, 19 ). Tergites 1–6 brown with distinct setae on posterior margin. Tergites 7–8 and sternites yellow with scattered pale setae stronger on posterior margin; tergite 8 shorter than sternite 8. Terminalia. Cercus brown, greatly enlarged, a bluntly pointed apical process incurved with serrate posteroapical margin ( Figs 19, 20 ), left and right cerci closely approximated anterodorsally ( Fig. 21 ), distinctly setose. Epandrium brownish, narrow, rather inflated basally, narrower and somewhat hook-shaped distally ( Fig. 20 ), with distinct row of strong setae on outer face ( Fig. 20 ), spine-like setae on inner margin apically ( Fig. 22 ). Hypandrium yellowish, membranous, rather rectangular in ventral view, not markedly inflated, lacking strong setae ( Fig. 24 ); gonocoxal apodemes projecting as narrow process just beyond anterior margin of hypandrium ( Fig. 23 ). Subepandrial sclerite with two finger-like posterior processes ( Fig. 22 ). Phallus strongly sclerotized, extending well beyond of the hypandrium apex, bluntly pointed apically, with subapical membranous area ventrally, covered with minute dark spicules ( Fig. 23 ). Ejaculatory apodeme absent. Body length: 2.4 mm; wing length: 2.3 mm. Female. Unknown.

Type material. HOLOTYPE ♂ “ Brasil, AM[azonas], Pq.[arque] N.[acional] Jaú. IG.[arapé] Miratucu/ IG.[arapé] Gerlei. 01º57'00''S- 61º49'00''W / 23–28.vii.1995. Rafael & J. Vidal” ( INPA) PARATYPES. Same data as holotype (8 ♂, INPA); Idem, Ipiranga. 02º03'05''S- 61º33'32''W, 29–31.viii.1995, Arm. Cola. Rafael & J.F.Vidal (10 ♂, MZUSP); Idem, Res. Ducke, Ig. Ipiranga, Arm. Malaise, v.2003, J.M.F.Ribeiro, J. Vidal & J Vidal (11 ♂, INPA); Idem, Ig. Tinga, iii.2003 (3 ♂, MNRJ); Idem, 5.viii.1993, IG. Acara, Malaise, Vidal (2 ♂, MPEG); Idem, Rod. AM 0 10 Km 26, Ig. Acará, x.2001, Arm. Malaise, J. Vidal (10 ♂, NMWC); Idem, Novo Airão, AM-352, Ig. Mato Grosso. 21–23.x.1994 (3 ♂, CNC).

Holotype condition. Good condition. Notopleural bristles lost. Not dissected.

Variation. Body ranging from 2.4 mm to 3.0 mm. Wing length varying from 2.3 mm to 2.7 mm. In some paratypes the femoral formula is 7/16–18/18 –21/6.

Etymology. From the Latin dilatatus (enlarged) which refers to greatly enlarged cercus.

Remarks. Hemerodromia cercusdilatata sp. nov. appears to belong in the informal melangyna species - group (sensu Vaillant & Gagneur 1998: 376) in having the cercus greatly enlarged, fore tibia without an apical spur but with a long, slender and pointed apical spine. Hemerodromia cercusdilatata sp. nov. is similar to H. melangyna Collin, 1961 , by tergites 7–8 and sternites yellow and similar shape of epandrium. Hemerdromia cercusdilatata sp. nov. differs from the latter by fore tibia with 2 rows of pointed spinose setae ventrally; cercus with a bluntly pointed apical process incurved with serrate posteroapical margin; subepandrial sclerite with two finger-like posterior process; and phallus sclerotized, with subapical membranous area ventrally, covered with minute dark spicules. In H. melangyna T1 with 1 row of pointed spinose setae ventrally; the cercus is hemispheric; subepandrial sclerite with 2 triangular posterior process; and phallus membranous, without minute dark spicules.

Figures

FIGURES 16 – 24. Hemerodromia cercusdilatata sp. nov., 16 – 18, holotype ♂. 19 – 24, paratype ♂. 16. habitus, lateral view; 17. wing; 18. fore coxae, femur, tibia and tarsomeres; 19. abdomen from segment 2 to terminalia, lateral view; 20. terminalia, lateral view; 21. cercus, epandrium and subepandrial sclerite, dorsal view; 22. subepandrial sclerite and epandrium, dorsal view; 23. phallus, hypandrium, gonocoxal apodeme and subepandrial sclerite, lateral view; 24. hypandrium, epandrium and cercus, ventral view.