Dactylonotus nigricorpus, Igor Ya. Grichanov, 2016

Igor Ya. Grichanov, 2016, Two new species of Dactylonotus Parent, 1934 (Diptera: Dolichopodidae) from South Africa and a key to Afrotropical species, European Journal of Taxonomy 175, pp. 1-9 : 2-4

Dactylonotus nigricorpus sp. nov.

urn:lsid:zoobank.org:act: 6 A 263872 - 6460 - 45 CF- 8 CDF- 387 C0D 610111

Figs 1 –4, 11

Diagnosis

The new species is close to D. rudebecki Vanschuytbroeck, 1960 as described by Grichanov (1998) under the name D. meuffelsi , differing from the latter and all other species of the genus in the black body, smaller size, shorter antenna, the hypopygium morphology, the arista-like stylus apical, the mid femur without long setae, the simple tarsi with short claws and the small pulvilli.

Etymology

The species name is composed from Latin “niger” and “corpus” (black body)..

Type material

Holotype

REPUBLIC OF SOUTH AFRICA: ♂, Western Cape, Table Mountain N.P., Clovelly, sweeping grasses & mature fynbos , 34 °07.465 S, 18 ° 26.094 E, 24 Oct. 2012, 64 m, A.H. Kirk-Spriggs ( BMSA).

Description

Male ( Figs 1 –4, 11)

MEASUREMENTS. Body length without antennae 3.8 mm, antenna length 1.4 mm, wing length 3.2 mm, wing width 1.2 mm.

HEAD. Frons small, black, grey pollinose, with medial trapezoid depression, slightly prominent around base of antennae; face densely whitish pollinose, weakly narrowed in upper part, with parallel sides in lower part, 2 × as high as wide at clypeus; occiput flat, black, grey pollinose; one pair of long ocellar and short postvertical setae; no vertical setae; postocular setae black in upper part and white in middle and lower parts of head; eyes with short white hairs; antennae ( Fig. 2) inserted at upper fifth of head, black, 2 × longer than height of head; scape long, microscopically haired; pedicel with long, slightly widened at apex, dorso-lateral (inner view) process, covered by dorsal, lateral and ventral setulae; postpedicel very long, widest at apex of pedicel, with acute apex, 3 × as long as high in middle, entirely covered by microscopic hairs; arista apical, with microscopic hairs. Length ratio of scape to pedicel to postpedicel (dorsal to ventral sides) to arista-like stylus (1st and 2 nd segments) in mm, 0.27/0.40/0.49/0.74/0.05/0.32. Palpus and proboscis short, black, with black hairs.

THORAX. Mostly black, with black bristles; mesonotum weakly pollinose; pleura densely grey pollinose; metanotum brownish below; propleuron with 2 strong black setae in lower part; 6 pairs of dorsocentral bristles decreasing in size anteriorly, with several scattered hairs on anterior slope; acrostichals biseriate, extending to 5 th pair of dorsocentrals; scutellum with two long strong bristles and two short fine lateral setae, 1/4 as long as medians, dorsally bare.

LEGS. Including coxae yellow, with black bristles, tarsi brown-black from tip of basitarsus; fore coxa anteriorly with short black hairs and five or six black lateral and apical setae of various length in one row; mid coxa anteriorly with rather long black hairs and setae; mid and hind coxae with black bristle at base. Femora without long setae; mid and hind femora with one strong subapical anterior seta; fore tibia with 3 strong anterodorsal, 2 short posterodorsal, 3 short ventral setae; mid tibia with 3 strong anterodorsal, 1 small dorsal, 1 strong and 2 small posterodorsal, 1 anteroventral, 1–2 small posteroventral setae; hind tibia with 3 anterodorsal, 3 posterodorsal, 4–5 short ventral setae; all tibiae with strong apical setae; all tarsi simple, with short claws and small pulvilli. Femur, tibia and tarsomere (from first to fifth) length ratio: fore leg: 65/75/38/22/16/11/10, mid leg: 88/102/51/27/21/12/12, hind leg: 95/120/39/39/28/17/12.

WING (Fig. 3). Ovate, fumous; veins brown; R4+5 and M1+2 slightly curved posteriad at apex; M1+2 nearly straight; crossvein dm-cu straight; ratio of dm-cu to apical part of CuA 1 (in mm), 0.28/0.66; anal vein foldlike; anal angle obtuse; lower calypter yellow, with black cilia; halter yellow.

ABDOMEN. Mostly black, with black hairs and marginal setae; 6 th segment reduced; 7 th segment small, bare; 8 th segment with short hairs and row of strong setae; hypopygium (Figs 4, 11) black; epandrium subtriangular, strongly projected ventrally; hypandrium simple, broad, curved, with subapical spinelike process; phallus expanded at apex and biapicate; two epandrial setae positioned on distal side of epandrium, one of them (dorsal) pedunculate; epandrial lobe long, fingerlike, with rounded apex and short apical seta; surstylus yellow-brown, bilobate, with almost straight lobes, with several setae as figured; ventral lobe thinner than dorsal lobe, clavate; postgonite small, slightly curved ventrally; cercus short, yellow, with black setae.

Female

Unknown.

Distribution

South Africa (Western Cape).