Enlinia touroulti, Runyon & Pollet, 2018

Runyon, Justin B. & Pollet, Marc, 2018, Enlinia Aldrich, 1933 of Mitaraka, French Guiana (Diptera: Dolichopodidae), Zoosystema 40 (19), pp. 453-468 : 463-464

Enlinia touroulti n. sp.

( Fig. 10 )

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

TYPE MATERIAL. — Holotype. ♂, slide mounted. First label:“ GUYANE, Maripasoula, N 2°13’59.1” / W 54°26’37.9”, 433m, white pan trap, tropical moist forest (plateau), 24.ii.2015 - 2.iii.2015, sample cd: MI-TARAKA/117, M. Pollet leg.”. Second label: “ HOLOTYPE ♂ Enlinia touroulti Runyon & Pollet 2018 ” (red label). Deposited at MNHN. Paratype. ♂, slide mounted. First label: “ GUYANE, Maripasoula, MIT-C-RBF2, N 2°14’03.4” / W 54°26’53.0”, 299m, on vegetation along muddy trail and in swamp, 11.iii.2015, sweep net, sample cd: MITARAKA/106, M. Pollet leg.” Deposited at USNM .

ETYMOLOGY. — This species is named in honor of, and out of respect to, Julien Touroult, the leader of the entomological team at Mitaraka who managed to have a wide array of traps operational during the survey and as such contributed considerably to the discovery of some of the new Enlinia species.

DIAGNOSIS. — This species belongs to the E. simplex species group ( Robinson 1975) that presently contains 11 relatively inornate species with unarmed abdominal sternites, relatively simple hypopygial appendages, and wing vein R 2+3 bulging slightly inward from costa on apical half. Species in this group are also relatively small in comparison to other Enlinia species (1 mm or less) and have characteristically modified fore tarsi with compressed and broadened tarsomeres 1-2 and tarsomere 3 bearing a small but often stouter seta (as in Fig. 10B ). The shape of the subquadrate cerci and hypopygial appendages in E. touroulti n. sp. are distinctive. Details in the form of the male foretarsus, the arrangement of slender ventral setae on femora, and the form of the middle tibia also differ from the other known species in the E. simplex group.

DESCRIPTION

Male

Body size. Length. 0.8 mm, wing length 0.8 mm by 0.3 mm (width).

Head. Face and frons dark metallic green. Face narrowed below, eyes essentially contiguous on lower half; anterior eye facets distinctly enlarged. Palpus brown; proboscis brown. Antenna ( Fig. 10A ) dark brown; first flagellomere short and blunt, about twice as wide as long, nearly square in lateral view and round in anterior view; arista-like stylus apical, about as long as height of eye. Thorax. Scutum dark brown with slight metallic green reflections and very sparse pollen; setae brown with weak pale reflections; 6 pairs of small acrostichal setae; 6-7 pairs of dorsocentral setae; one pair of relatively widely spaced scutellar setae and one pair of very small lateral hairs.

Legs. Yellow-brown with trochanters and basal tarsomeres paler. Fore coxa with about 5 short anterior hairs on apical half. Fore femur with a very slender, erect ventral seta near base (length less than width of femur) and 3-4 smaller anteroventral setae on apical half. Mid femur with 3 very slender erect ventral setae on basal 1/3 (length less than width of femur) and row of 3-4 very small erect anteroventral setae on apical half. Mid tibia ( Fig. 10C ) flattened dorsoventrally and slightly expanded, with row of short, somewhat stout anteroventral setae that are longest distally. Hind tibia with 1-2 dorsal setae near base. Fore tarsus ( Fig. 10B ) with tarsomere 1 slightly expanded and flattened dorsoventrally, about twice as long as wide; tarsomere 2 flattened dorsoventrally and slightly concave ventrally, about as long as wide, with 2-3 longer hairs near apex; tarsomere 3 small, nearly round, slightly concave ventrally, inserted to one side in small notch of tarsomere 2, with distinct short black marginal seta just beyond 1/2. Basal 2-3 tarsomeres of mid and hind tarsus distinctly light yellow to nearly white. Ratios of tibia:tarsomeres for fore leg: 9-3-2- 2-1-3; for mid leg: 14-4-2-2-1-3; for hind leg: 15-4-3-2-2-3.

Wing ( Fig. 10E ). Hyaline, elongate-oval, hind margin evenly rounded and short-fringed; vein R 2+3 slightly and evenly arched and curving slightly but distinctly forward at apex; vein R 4+5 and M 1 nearly straight, diverging from near base, with M 1 very slightly arching backwards beyond crossvein dm-cu; crossvein dm-cu perpendicular to vein M 1, less than half the length of apical part of vein CuA 1; vein A 1 represented as a short brown streak close to anal margin. Halter brown.

Abdomen ( Fig. 10D ). dark brown with sparse, very short, stiff, black setae. Sternites plain, without armatures; sternite 5 with 2 distinct setae near apex. Hypopygium capping tip of preabdomen, brown; cerci subquadrate, light brown with margin thinly darkened, with a few slender pale hairs; inner appendages larger than cerci, somewhat triangular, thin and translucent with a minute dorsal hair just beyond 1/2.

Female

Unknown.

Figures

FIG. 10. — Enlinia touroulti n. sp., ♂: A, antenna, lateral view; B, fore tibia and tarsus, ventral view; C, mid tibia and tarsomere 1, ventral view (anterior is to the left); D, abdomen and terminalia, right lateral view; E, wing. Abbreviations: cerc, cerci. Scale bars: A, 0.1 mm; B-D, 0.25 mm; E, 0.5 mm.