Hemerodromia cornuhypandrialis, Câmara, Josenir T., Takiya, Daniela M., Plant, Adrian R. & Rafael, José A., 2015

Câmara, Josenir T., Takiya, Daniela M., Plant, Adrian R. & Rafael, José A., 2015, Neotropical Hemerodromia Meigen (Diptera: Empididae), a world of discovery II: New species from Atlantic forest, Brazil, Zootaxa 4028 (2), pp. 197-214 : 202

Hemerodromia cornuhypandrialis sp. nov.

( Figs 15–21 )

Diagnosis. Yellow species ( Fig. 15 ). Epandrium with a long subapical flattened projection directed dorsally ( Fig. 17 ); and subepandrial sclerite with subtriangular anterior projection, with small, median finger-like posterior process ( Fig. 19 ).

Description. Male. Head ( Fig. 15 ). 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 frontal setulae; 1 pair of distinct vertical setae contiguous with uniseriate row of smaller postocular setae. Occiput bearing scattered fine hairs. Clypeus with rather dense, short downwardly directed pile. Proboscis slightly curved with setae yellow. Antenna with scape and pedicel bearing distinct, short dorsal setulae; postpedicel about 2X as long as wide, stylus ~ 0.8X as long as postpedicel. Thorax ( Fig. 15 ). Elongate, slightly arched ventrally; thoracic dorsum yellow except brownish on prothoracic collar, posterolateral area above scutellum and mediotergite; antepronotum with anterior margin almost straight and scutum with yellow setae, very small and fine except 1 notopleural and 1 pair of scutellars. Legs ( Fig. 15 ). Whitish yellow. C1 ~ 1.3X longer than distance between C1 and C2, 6X as long as wide with some pale dorsoapical setae. F1 ~ 1.2X as long as C1, 3.5–4.0X as long as wide. Femoral formula 6/20–21/18 –19/6–7; basal spines stronger; denticles confined to distal 0.8, becoming closer together distally, black, 2 rows linear, without distal discontinuity. T1 ~ 0.6X as long as F1, evenly curved, ventral face shallowly concave; about 15–17 sharply pointed spinose setae ventrally, posteroventral row more distinct; dorsal ciliation of decumbent short pale setulae, denser distally; with small apicoventral extension on T1 bearing strong apical spine. Mid- and hind legs slender with fine setae; T3 with ‘comb’ of short setae posteroapically. Wing. 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; 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 15, 16 ). Tergites 1–6 and 8 brownish; tergites 7 and sternites yellow with pale setae most conspicuous on posterior margin; tergite 8 shorter than sternite 8. Terminalia. Brownish ( Figs 16, 17 ). Cercus narrow, wide basally and pointed at apex ( Fig. 17 ), left and right cerci closely approximated anterodorsally ( Fig. 18 ), distinctly setose. Epandrium rounded at apex, with long subapical flattened projection directed dorsally ( Fig. 17 ), scattered distinct setae on outer face and spine-like setae on inner face of dorsal projection; articulated to hypandrium by weak point anteriorly. Surstylus absent. Hypandrium subtriangular ( Fig. 20 ), with 2 posterior hornlike projections ( Fig. 21 ) with distinct setae; gonocoxal apodeme projecting as narrow process just beyond anterior margin of hypandrium. Subepandrial sclerite with subtriangular anterior projection, with small, median finger-like posterior process ( Fig. 19 ), with distinct setae at apex. Phallus strongly sclerotized ( Fig. 21 ), extending well beyond hypandrium apex, rather rounded at apex. Ejaculatory apodeme absent. Specimen length: 4.4 mm; wing length: 3.9 mm. Female. Unknown.

Geographic distribution. Brazil (Rio de Janeiro State).

Type material. HOLOTYPE ♂, “ Brazil, RJ[Rio de Janeiro], Itatiaia, Parque Nacional do Itatiaia. Córrego Maromba, abaixo da Cachoeira Véu de Noiva, Malaise trap. S 22º25'38.6" W 44º37'9.7" 1140m, 10.i–02.ii.2015, PNI01. DM Takiya, APM Santos & MLF Monné” ( INPA). Paratypes: Same data of holotype (5 ♂, INPA, 2 ♂, MWNC, 3 ♂, MNRJ).

Holotype condition. Good. Not dissected.

Etymology. From the Latin cornus meaning a horn, in reference to the horn-shaped apex of the hypandrium.

Variations. Body length varying from 2.9–4.5 mm and wing length varying from 2.6–4.0 mm.

Remarks. Hemerodromia cornuhypandrialis sp. nov. differs from other species specifically by the shape of the epandrium in having a long subapical flattened projection directed dorsally ( Fig. 17 ), scattered distinct setae on outer face and spine-like setae on inner face of the dorsal projection.

Figures

FIGURES 15 – 21. Hemerodromia cornuhypandrialis sp. nov., 15, holotype ♂. 16 – 21, paratype ♂. 15, habitus, lateral view; 16, abdomen from segment 5 to terminalia, lateral view; 17, terminalia, lateral view; 18, cercus, dorsal view; 19, subepandrial sclerite and epandrium, dorsal view; 20, epandrium and hypandrium, ventral view; 21, hypandrium and phallus, lateral view.