Isoneuromyia nigerrima Evenhuis

Evenhuis, Neal L., 2006, New species of Isoneuromyia Brunetti (Diptera: Keroplatidae) from the Oriental Region, Zootaxa 1140, pp. 1-29 : 17-19

Isoneuromyia nigerrima Evenhuis , n. sp.

( Figs. 3 , 24 , 29 , 37)

Diagnosis

Closest to pulcherrima but can be distinguished from it by the brown face (yellow in pulcherrima), the fore femur being entirely reddish yellow (fore femur brown dorsally, yellow ventrally in pulcherrima), and the ocellar callus concolorous with the surrounding frontal and occipital areas (the callus contrasting in color with the surrounding area in pulcherrima).

Description

MALE. Lengths: Body: 8.0–9.0 mm; wing; 5.8–6.0 mm.

Head. Vertex and occiput immediately behind ocelli black, brown near occipital foramen, remainder of occiput orange with fairly dense small recumbent black hairs above, yellow tomentose below. Ocelli in horizontal line. Frons with upper portion black, lower portion yellowish orange, bare. Antennae brown, scape and pedicel with tinge of yellow apically. Face orange, silvery pruinose with a few hairs laterally. Palpi reddish brown, last palpomere brown. Proboscis orange.

Thorax. Mesonotum predominantly dark brown with silvery pruinosity, anteromedial portion of mesonotum lighter brown. Scutellum dark brown. Mesonotum with uniformly distributed small recumbent black hairs dorsally, patch of thick black setae on postalar calli and posterior margin of scutellum. Prescutellar area tapering to scutellum. Pronotal lobes dark brown with black setae laterally. Pleura and mediotergite dark brown, bare. Halter yellow.

Legs. Coxae yellowish, black basally, with black hairs. Fore and mid femora brown basally, yellow apically, hind femur dark brown, all femora with recumbent black hairs. Fore tibia with orange tibial pecten apically. Tibial spurs black. Fore basitarsus 1.2 x length of fore tibia. Mid and hind basitarsi subequal in length to lengths of respective tibiae. Claws minute.

Wing ( Fig. 24 ). Subhyaline with brown infuscation subapically from costa to apex of cell m2; vein R4 slightly sinuous, ending in C slightly beyond end of R1; veins M2, CuA1, and A1 not reaching wing margin.

Abdomen. Tergites I–II and V–VI black, with dense recumbent black hairs; tergites III–IV yellow basally, bare; tergites VII–VIII yellowish with yellow hairs. Sternum as on tergites.

Hypopygium (Fig. 37). Gonocoxites and gonostyli yellowish, with fine black hairs, apex with two large dark black teeth and one squarish peg­like tooth (Fig. 37B) in close association with lower black tooth (gonostylus needs to be turned slightly to see it).

FEMALE. Unknown.

Types

Holotype ♂ (BPBM 16,594) and paratype ♂ [tip of abdomen missing] from: LAOS: Vientiane Province: Ban Van Eue, 30 Jun 1967, native collector. Holotype and paratype in BPBM.

Etymology

The species epithet derives from the Latin niger = black, referring to the predominantly black coloration of the thorax and abdomen.

Figures

FIGURES 1 – 6. 1 – 2. Isoneuromyia heads, lateral view, showing general shapes, antennal flagellomeres and vestiture removed. 1. I. splendida, n. sp. 2. I. yorki, n. sp. 3 – 6. Isoneuromyia antennae, lateral view. 3. I. nigerrima, n. sp. 4. I. splendida, n. sp. 5. I. polybioides (Edwards). 6. I. glabra, n. sp.

FIGURES 20 – 26. Isoneuromyia wings, showing apical patterning. 20. I. splendida, n. sp. 21. I. subapicalis, n. sp. 22. I. nigribasis, n. sp. 23. I. glabra, n. sp. 24. I. nigerrima, n. sp. 25. I. jata, n. sp. 26. I. yorki, n. sp.

FIGURES 27 – 33. 27 – 30. Isoneuromyia habituses, lateral view showing thoracic and abdominal shapes and patterning, legs beyond coxae removed and wing venation not shown. 27. I. brunettii, n. sp. 28. I. variabilis, n. sp. 29. I. nigerrima, n. sp. 30. I. pallidopsis, n. sp. 31 – 33. Isoneuromyia abdomens, dorsal view showing patterning. 31. I. splendida, n. sp. 32. I. subapicalis, n. sp. 33. I. nigribasis, n. sp.