Enlinia loboptera, Runyon & Pollet, 2018

Runyon, Justin B. & Pollet, Marc, 2018, Enlinia Aldrich, 1933 of Mitaraka, French Guiana (Diptera: Dolichopodidae), Zoosystema 40 (19), pp. 453-468 : 455-457

Enlinia loboptera n. sp.

( Figs 1-3 )

urn:lsid:zoobank.org:act:2CEE1B04-FF43-4D1C-AE42-77A1F653754A

TYPE MATERIAL. — Holotype. ♂, pinned. First label: “ GUYANE, 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 loboptera Runyon & Pollet 2018 ” (red label). Deposited at MNHN.

Paratypes. 112 ♂, 218 ♀, same label data as holotype. 40 ♂, 175 ♀, first label: “ GUYANE, Maripasoula , N 2°14’11” / W 54°27’07”, 306m, Malaise trap (6m), 24.viii.2015, river, J. Touroult, E. Poirier leg.” Second label: “tropical wet forest, La Planète Revisitée Guyane 2015, MNHN PNI, sample cd: MITARAKA/193”. 1 ♀, same label data as previous, except: 25.viii.2015, sample cd: MITARAKA/189. 1 ♀, first label: “ GUYANE, Maripasoula, 1.iii.2015, SLAM, J. Touroult, E. Poirier leg.” Second label: “nr base camp/along trails; La Planète Revisitée Guyane 2015, MNHN PNI, sample cd: MITARAKA/194”. 1 ♀, same label data as previous, except: 1 -6.iii.2015, sample cd: MITARAKA/195. 1 ♂, same label data as previous, except: 12 -20. viii.2015, P. - H. Dalens leg., sample cd: MITARAKA/229. 3 ♀, first label: “ GUYANE, Maripasoula , N 2°12’21.9” / W 54°26’11.6”, SLAM, 26.ii.2015, J. Touroult, E. Poirier leg.” Second label: “MIT-C-Born 1 - rocks, La Planète Revisitée Guyane 2015, MNHN PNI, sample cd: MITARAKA/214”. Deposited at MNHN, MAPC, MTEC, USNM. Second label: “MITC-Born 1 - rocks, La Planète Revisitée Guyane 2015, MNHN PNI, sample cd: MITARAKA/214”. Deposited at MNHN, Coll. MAPC, MTEC, USNM .

ETYMOLOGY. — This species is named for the distinctly lobed posterior margin of the wing in males ( Fig. 3 ).

DIAGNOSIS. — The shape of the male wing ( Fig. 3 ) and the row of large, modified setae on the hind tibia ( Fig. 2 ) distinguish E. loboptera n. sp. from all other known Enlinia species, except E. bova n. sp. Males of these two species share many unique characteristics (e.g. wing shape and distinct chaetotaxy of fore, mid and hind legs) and form a group that stands apart from other known Enlinia species. Enlinia loboptera n. sp. is distinguished from the latter species by the short cerci with relatively short setae that extend anteriorly only to sternite 4 ( Fig. 1E ) whereas the cerci of E. bova n. sp. possess very long setae that reach the base of the abdomen ( Fig. 4E ). Females are recognized by the form of the hind basitarsus, the distinct apical ventral seta on fore and mid tibia, and body size less than 1.3 mm.

DESCRIPTION

Male

Body size. Length 1.2-1.3 mm, wing length 1.1-1.2 mm by 0.5 mm (width).

Head. Face and frons dark brown to black with very sparse brown pollen. Eyes essentially contiguous below antennae; anterior facets very enlarged; hairs between facets noticeably longer near mouth. Palpus brown with silvery pollen. Proboscis brown. Antenna (as in E. bova n. sp., Fig. 4A ) dark brown; first flagellomere about as long as wide, triangular and rather sharply pointed; arista-like stylus apical, about as long as height of eye.

Thorax. Scutum rather arched, dark brown to black with very sparse brown pollen and weak violet to dark green reflections; pleura dark brown to black, slightly lighter brown posteriorly. Setae on dorsum short, brown with pale reflections; 7-9 pairs of small acrostichal setae; 8-10 pairs of dorsocentral setae; scutellum with one pair of widely separated median setae and one pair of very small lateral hairs.

Legs. Brown with mostly dark setae but most setae with very strong pale reflections and appearing yellow in certain views and lights (as in Fig. 2 ). Fore coxa mostly bare except for a large, black seta on outer anterior surface at apex, most specimens also with a pair of setae on inner anterior surface near 1/2. Hind trochanter (as in E. bova n. sp., Fig. 4B ) with a stout black ventrally-directed spine near 1/2 on anterior surface (length subequal to length of trochanter). Fore femur slightly swollen, with long, slender setae on ventral and anterior surface, those on anterior surface longest and slightly curved apically, with row of about 4 long, slender setae along posteroventral edge (as in E. bova n. sp. Fig. 4C ). Mid femur with stout ventral seta arising near base, held close to ventral surface of femur and curved apically; with row of three slightly broadened anteroventral setae at apex decreasing in length apically ( Fig. 1D ). Hind femur with longer anteroventral setae on apical half (longest setae subequal to width of femur). Fore tibia ( Fig. 1A ) gradually widened toward apex and slightly dorsoventrally flattened, with large ventral setae on apical half ( Fig. 1B ). Mid tibia ( Fig. 1C, D ) slightly widened and flattened dorsoventrally, bare dorsally; with one anteroventral row of 10-12 large setae along full-length of tibia; with about 3-4 long, slender posteroventral setae on basal half; with a few long, slender ventral setae near apex. Hind tibia ( Fig. 2 ) somewhat flattened on basal 2/3 and slightly curved with a row of distinct anterior setae that are abruptly narrowed and strongly elbowed near apical 2/3, these setae becoming smaller toward apex of tibia with apical-most seta slightly thickened and hook-like. Fore tarsus ( Fig. 1A, B ) extremely modified; tarsomere 1 about as wide as long with 3 large, modified setae on flattened ventral surface; tarsomere 2 smaller than tarsomere 1 with short, finger-like posterior lobe bearing a rounded seta, with long dorsal seta, and with small leaf-like, lanceolate posteroventral seta near base; tarsomere 3 somewhat U-shaped with flattened, tongue-shaped, black apical process, with stout, hooked dorsal seta and 3 short, stout setae on anterodorsal edge; tarsomere 4 unmodified with a couple of larger dorsal setae. Mid tarsus with tarsomere 1 bearing short ventral setae that are hooked at apex ( Fig. 1D ); tarsomeres 2 and 3 with a slightly larger dorsal seta at apex. Hind tarsus with tarsomere 1 short, slightly longer than wide and slightly flattened. Ratios of tibia:tarsomeres for fore leg (for highly modified tarsomeres, width given in parentheses): 12-4-3-5(8)-4-6; for mid leg: 15-6-2-3-3-3; for hind leg: 22-5-8-5-3-3.

Wing ( Fig. 3 ). Approximately oval with cuneate base and with sinuous hind margin and broad, projecting lobe near apex of vein CuA 1; hind margin with slightly longer, straight hairs that become very short and dense on lobe; wing clear; vein R 2+3 slightly sinuous and close to costa, curved slightly forward at apex; vein R 4+5 nearly straight, ending before wing tip; vein M 1 nearly straight and evenly diverging from vein R 4+5, very slightly arched backwards beyond crossvein; vein CuA 1 arching backwards beyond crossvein dm-cu, reaching wing margin and ending near apex of lobe, last part of vein CuA 1 nearly 3 times as long as crossvein dm-cu; vein A 1 short and represented by a streak of pigment along and close to anal margin, becoming a brown streak apically, wing otherwise hyaline. Halter brown.

Abdomen ( Fig. 1E ). Dark brown, usually slightly lighter in color than thorax; setae short and brown with pale reflections. Sternite 4 with short median armature at hind margin. Hypopygium brown; cerci pale brown and becoming darker apically, small, longer than wide, spatulate on apical half with comb of black setae on outer margin.

Female

Body size. Length 1.1-1.3 mm, wing length 0.9-1.0 mm by 0.4-0.5 mm (width). As in male except lacking modified wing, legs, and abdominal sternites. Face wider and distinct to mouth (width of face subequal to width of first flagellomere). Antenna with first flagellomere slightly less pointed apically. General form of basitarsus present in females (as in E. bova n. sp., Fig. 4B ) and also one large ventral seta at apex of fore and mid tibiae. Wing margin evenly rounded.

REMARKS

Enlinia loboptera n. sp. was by far the most abundant species taken at Mitaraka, and the sex ratio was distinctly female-biased (154 males: 396 females). To separate females of E. loboptera n. sp. from those of the related species, E. bova n. sp., we primarily used body size since females of E. bova n. sp. should be noticeably larger since the male is larger.

Figures

FIG. 1. — Enlinia loboptera n. sp., ♂: A, fore tibia and tarsus, dorsal view; B, apex of fore tibia and tarsomere 1, ventral view; C, mid tibia and tarsomere 1, dorsal view; D, apex of mid femur, tibia, and tarsomere 1, anterior view; E, tip of abdomen and terminalia, left lateral view. Abbreviations: cerc, cerci; S4, abdominal sternite 4. Scale bars: A, C-E, 0.5 mm; B, 0.1 mm.

FIG. 2. — Enlinia loboptera n. sp., ♂: hind tibia and hind tarsus, dorsal view. Scale bar: 0.5 mm.

FIG. 3. — Enlinia loboptera n. sp., ♂ wing. Scale bar: 0.5 mm.

FIG. 4. — Enlinia bova n. sp., ♂: A, antenna, lateral view; B, hind leg from tip of coxa, anterior view; C, fore leg, posterior view; D, tarsomere 1 of fore leg, ventral view (anterior is toward bottom of page); E, tip abdomen and terminalia, right lateral view. Abbreviations: cerc, cerci; S4, abdominal sternite 4. Scale bars: A, D, 0.1 mm; B, C, E, 0.5 mm.