Enlinia mitarakensis, Runyon & Pollet, 2018

Runyon, Justin B. & Pollet, Marc, 2018, Enlinia Aldrich, 1933 of Mitaraka, French Guiana (Diptera: Dolichopodidae), Zoosystema 40 (19), pp. 453-468 : 461-463

Enlinia mitarakensis n. sp.

( Figs 8 , 9 )

urn:lsid:zoobank.org:act:190DD118-10FB-47AB-9922-7B8CC4F4AFB1

TYPE MATERIAL. — Holotype. ♂, slide mounted. First label: “GUY-ANE, Maripasoula, N 2°13’59.8” / W 54°27’46.5”, 471m, Malaise trap (6m), 13.viii.2015 - 20.viii.2015, P.-H. Dalens leg.” Second label: “partially open areas on savane roche 2; La Planète Revisitée Guyane 2015, MNHN PNI, sample cd: MITARAKA/230”. Third label: “ HOLOTYPE ♂ Enlinia mitarakensis Runyon & Pollet 2018 ”(red label). Deposited at MNHN.

ETYMOLOGY. — Named after the Mitaraka Massif in southwestern French Guiana, where the type specimen was collected .

DIAGNOSIS. — The form of the male wing ( Fig. 9 ) with a brown spot or streak midway between veins R 4+5 and M 1 will distinguish this species from all other known Enlinia . This is also the only known species in the genus with males having an armature on abdominal sternite 2 ( Fig. 8D ); males of other known species often have sternites 3 and/or 4 modified, but not sternite 2.

DESCRIPTION

Male

Body size. Length. 1.2 mm, wing length 1.0 mm by 0.4 mm (width).

Head. Face and frons dark brown to black. Eyes essentially contiguous below antennae; anterior eye facets distinctly enlarged. Palpus dark brown; proboscis yellow-brown. Antenna ( Fig. 8A ) brown; first flagellomere short, blunt, wider than long; arista-like stylus apical, about as long as height of eye.

Thorax. Scutum dark brown with very sparse gray pollen; pleura dark brown. Setae brown with pale reflections; 6-7 pairs of small acrostichal setae; 9-10 pairs of dorsocentral setae, posterior-most distinctly larger; one pair of widely separated scutellar setae and one pair of minute small lateral hairs.

Legs. Yellow-brown, with coxae and hind femora darker brown. Fore coxa with 3 fine upcurved hairs near apex anteriorly. Mid coxa with 2 short, stout ventrally-directed setae near apex. Mid trochanter ( Fig. 8C ) with rather large black ventral seta (in line with row of ventral setae on middle femur). Fore femur with one erect ventral seta near base (length subequal in width of femur). Mid femur ( Fig. 8C ) ventrally with stout setae nearly full-length; basal-most seta pale, very long, and slightly curved; the two setae distal to this large pale seta stouter than remaining setae. Fore tibia with posteroventral row of short black setae running nearly full-length. Mid tibia ( Fig. 8C ) slightly arched and with very short, erect ventral setae on apical 1/3. Hind tibia with distinct subapical dorsal seta. Fore tarsus ( Fig. 8B ) highly modified, with numerous small, darkened/sclerotized lobes and processes; tarsomere 1 slightly thickened, flattened on ventral surface, with 3 setae in a row on anterodorsal surface; tarsomere 2 small, wider than long, with minute black process near apex; tarsomere 3 narrow at base, with black sclerotized and rounded ventral lobe, with 2 thin flattened nearly hyaline lobes along posterior edge (one lobe brown), and with a large black ventrally-directed seta near apex; tarsomere 4 with 3-4 setae along apical edge, the largest seta arising near insertion of tarsomere 5; tarsomere 5 narrow at base and evenly widening to apex, about a long as tarsomeres 3 and 4 combined. Ratios of tibia:tarsomeres for fore leg: 14-5-2-3-3-5; for mid leg: 16-6-4-3-2-3; for hind leg: 24-8-7-6-4-4.

Wing ( Fig. 9 ). Elliptical with cuneate base and slightly sinuous, long-fringed hind margin; with a small elongate brown spot near apical 2/3 midway between veins R 4+5 and M 1 and a second small brown area along hind margin just basal to apex of vein CuA 1; vein R 2+3 close to and parallel with costa basally and only slightly curved on apical half; vein R 4+5 nearly straight, ending near or just before wing apex; vein M 1 curving toward vein R 4+5 and then backwards beyond crossvein dm-cu; last part of vein CuA 1 not reaching wing margin, about 1.5 times as long as crossvein dm-cu; vein A 1 present as a short streak of brown pigment near wing base and along anal margin which is narrowly brown. Halter brown.

Abdomen ( Fig. 8D ). Brown with scattered short, stiff, brown setae; sternite 2 with linear, rod-like brown median armature projecting from hind margin.Hypopygium small, brown; cerci brown, small, about twice as long as wide, with approximately dorsal half covered in minute, stiff setae; epandrium with finger-like apical lobe bearing seta near apex.

Female

Unknown.

REMARKS

This species belongs to the E. magistri (Aldrich, 1932) species group established by Robinson (1975) for species with males featuring a sinuous, long-fringed hind wing margin and specialized setae or hairs on the fore coxa.

Figures

FIG. 8. — Enlinia mitarakensis n. sp., ♂: A, antenna, lateral view; B, apex of fore tibia and tarsus, ventral view; C, mid trochanter, femur, and tibia, anterior view; D, abdomen and terminalia, right lateral view. Abbreviations: cerc, cerci; S2, abdominal sternite 2. Scale bars: A, 0.1 mm; B, 0.3 mm; C, 0.4 mm; D, 0.5 mm.

FIG. 9. — Enlinia mitarakensis n. sp., ♂ wing. Scale bar: 0.5 mm.