Enlinia colossicornis, Runyon & Pollet, 2018

Runyon, Justin B. & Pollet, Marc, 2018, Enlinia Aldrich, 1933 of Mitaraka, French Guiana (Diptera: Dolichopodidae), Zoosystema 40 (19), pp. 453-468 : 459-461

Enlinia colossicornis n. sp.

( Figs 5-7 )

urn:lsid:zoobank.org:act:24480FF6-151D-410A-8E2A-3D580AC43A47

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 colossicornis Runyon & Pollet 2018 ” (red label). Deposited at MNHN. Paratypes. 17 ♂, 19 ♀, same label data as holotype. 10 ♂, 14 ♀, first label: “ GUYANE, Maripasoula, N 2°14’11”, W 54°27’07”, 306 m, Malaise trap (6 m), 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”. 2 ♀, same label data as previous, except: 25.VIII.2015, sample cd: MITARAKA/189. Deposited at MNHN, Coll. MAPC, MTEC, USNM .

ETYMOLOGY. — The species name is in reference to the relatively large first flagellomere of the antenna ( Figs 5 , 6A ) which is unusual for the genus (compare with e.g. Figs 4A , 8A , 10A ).

DIAGNOSIS. — The enlarged size and shape of the male antenna of E. colossicornis n. sp. ( Figs 5 , 6A ) will separate this species from all other known species of Enlinia . The shape and size of the antennal segments is very uniform within the genus, with the first flagellomere typically small and blunt (as in Figs 8A , 10A ). Only E. magnicornis Robinson, 1969 from Mexico has a similarly enlarged antenna, but has a very short arista that is only about as long as the first flagellomere (arista in E. colossicornis n. sp. is twice as long as first flagellomere), modified male front tarsi (unmodified in male E. colossicornis n. sp.), and erect setae along ventral edge of mid femur (mid femur essentially bare in E. colossicornis n. sp.). Males of E. colossicornis n. sp. are also unique among known species of Enlinia in possessing fore tarsi that are unmodified whereas the fore tarsus is modified in males of every other known species of the genus.

DESCRIPTION

Male

Body size. Length. 0.9-1.0 mm, wing length 1.0 mm by 0.4 mm (width).

Head. Face and frons dark brown to black. Face narrowed below but distinct to mouth; anterior eye facets only slightly enlarged. Palpus brown; proboscis yellow-brown. Antenna ( Figs 5 , 6A ) dark brown; first flagellomere longer than scape and pedicel combined, narrowed to narrowly rounded point apically, nearly straight along ventral edge and slightly concave dorsally, with relatively long pale pubescence; arista-like stylus apical, about twice as long as first flagellomere, with basal article very short and about 1/10 length of apical article.

Thorax. Scutum dark brown with very sparse gray pollen; pleura lighter brown than scutum. Setae brown with pale reflections; 6-8 pairs of small acrostichal setae; 6-8 pairs of dorsocentral setae; one pair of relatively closely spaced scutellar setae (insertion closer to middle than sides) and one pair of very small lateral hairs.

Legs. Yellow-brown and slightly lighter than pleura, with mid and hind femora sometimes darker. Fore femur mostly bare, with slender erect ventral seta near base (length subequal to width of femur). Mid femur rather slender and with about 2-3 short, slightly stout, ventral setae at base (length <width of femur). Mid tibia slightly arched on basal 1/3 and slightly thickened on apical 2/3, with mostly yellow hairs. Hind tibia ( Fig. 6C ) gradually and slightly widened toward apex, with longer yellow hairs on ventral surface (longest hairs subequal width of tibia). Tarsi unmodified except tarsomere 1 of hind tarsus slightly broadened with row of ventral setae (length ≤ width of tarsomere). Ratios of tibia:tarsomeres for foreleg: 10-4-2-2-2-3; for middle leg: 15-5-3-2-2-3; for hind leg: 17-4-4-4-4-4.

Wing ( Fig. 7 ). Hyaline but with slight brown tinge, narrowly elliptical with short-fringed hind margin; vein R 2+3 slightly arching and slightly curved forward at tip; veins R 4+5, M 1, and CuA 1 nearly straight and evenly diverging from wing base; vein R 4+5 ending at or just before wing apex; last part of vein CuA 1 about 2 times as long as crossvein dm-cu; vein A 1 present as a streak of brown pigment. Halter brown.

Abdomen ( Fig. 6D ). Dark brown with sparse, short, stiff, black setae. Sternites unmodified and without armatures, but sternite 4 more sclerotized medially at apex. Hypopygium small, brown, capping tip of preabdomen; cerci brown, small, slightly longer than wide and pointed apically, covered with short hairs.

Female

Body length. 0.9-1.1 mm, wing length 1.0- 1.1 mm by 0.4- 0.5 mm (width). Similar to male, but face wider (about as wide as width of first flagellomere) and narrowest at mouth; antenna ( Fig. 6B ) smaller, but still somewhat enlarged, globular and reflecting the same general shape as in male; legs without outstanding setae or hairs. Wing essentially as in the male ( Fig. 7 ).

REMARKS

This species resembles the E. magnicornis species group established by Robinson (1975) for species having males with an enlarged antenna and broad face. However, E. colossicornis n. sp. is distinct in having the male face not as wide and males with fore tarsus unmodified. The shape and size of the male antenna and the uniquely plain male fore tarsus suggests that E. colossicornis n. sp. might be a basal species within Enlinia .

Figures

FIG. 5. — Enlinia colossicornis n. sp., ♂ head and antenna, lateral view. Scale bar: 0.3 mm.

FIG. 6. — Enlinia colossicornis n. sp.: A, ♂ antenna, lateral view; B, ♀ antenna, lateral view; C, ♂ apex of hind femur, tibia, and hind tarsomere 1, anterior view; D, tip of ♂ abdomen and terminalia, right lateral view. Abbreviations: cerc, cerci. Scale bars: A, B, 0.1 mm; C, 0.5 mm; D, 0.3 mm.

FIG. 7. — Enlinia colossicornis 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.

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. 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.