Acnephalomyia probolos, Londt, 2010

Londt, Jason G. H., 2010, A review of Afrotropical Acnephalum Macquart, 1838, including the reinstatement of Sporadothrix Hermann, 1907 and descriptions of two new genera (Diptera: Asilidae: Stenopogoninae), African Invertebrates 51 (2), pp. 431-431 : 457-458

publication ID 10.5733/afin.051.0212

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scientific name

Acnephalomyia probolos

sp. nov.

Acnephalomyia probolos View in CoL sp. n.

Figs 50, 51 View Figs 44–51 , 68 View Fig

Etymology: From Greek probolos (any protruding or jutting object or prominence); noun in apposition. The name refers to the long, projecting hypandrium.

Description (Based on holotype. Condition: Good; double mounted, right prothoracic leg missing terminal four tarsomeres, left mesothoracic leg broken off and glued to mounting strip.):

Head: Dark red-brown to black, white setose, weakly silver pruinose.Antenna:Dark red-brown except for tip of style which is pale yellow. Segmental ratios 1.0:0.9:3.0:0.2:1.2, scape and pedicel subequal in length, pale whitish setose, macroseta on ventral aspect of pedicel longer than postpedicel. Face dark red-brown to black, apruinose except for narrow strips adjacent to eye margins, mystax white, covering entire face. Frons, vertex and postocular region dark red-brown to black, apruinose except for central part of postocular region, mainly white setose (some dorsal setae yellowish); angle subtended by eye margins at level of frons/vertex c. 17°. Proboscis red-brown, white setose. Palpus dark red-brown, 2-segmented, pale yellowish setose.

Thorax: Dark red-brown to black, apruinose, mostly white setose. Pronotum mostly white setose, but with group of pale yellowish macrosetae medially. Mesonotum mostly white setose interspersed with some yellow and dark red-brown ones. Lateral macrosetae moderately well developed, yellow (3 npl, 3 spal, 5 or 6 pal). Pleura largely asetose except for numerous, long, somewhat wavy, white katatergals, dorsally situated anepisternals and katepisternals. Scutellum shiny dark red-brown apruinose with poorly-developed transverse, subapical groove. About 10 moderately developed yellowish apical macrosetae accompanied by slightly shorter, fine, white setae; disc sparsely white setose. Legs: Mostly dark red-brown, but fem orange-brown ventrally. Major setae erect, whitish, minor setae white. Ventral parts of tar and distoventral tip of tib black setose. Claws black, longish (but shorter than tarsomere 5); empodia slender, yellow, about two-thirds length of claws; pulvilli tiny (about one-third length of empodium). Haltere yellow, base yellow-brown. Wing: 3.7× 1.5 mm. Veins brown, membrane lacking microtrichiae; entirely transparent, unstained. Vein R 4 with only a trace of a basal stump-vein.

Abdomen: Terga broader than long, dark red-brown to black. Terga apruinose, but entirely pitted by setal sockets. Terga with longish white setae laterally. White setae extend for a short distance along distal margins of terga, becoming shorter medially. Large areas of terga appear asetose, but are covered with tiny reddish brown setae. Sterna dark red-brown, apruinose, longish white setose (wavy anteriorly). Terminalia largely withdrawn between T6 and S6, distal parts somewhat obscured by setae. Genitalia ( Figs 50, 51 View Figs 44–51 ): Epand highly reduced. Proc in lateral view longer than epand. Exterior lobe of goncx tapering to a fairly acute tip; interior lobe longish, finger­like and jutting out to about same level as achieved by aedeagal tip. Gonst small. Hypd in ventral view somewhat truncate basally, tapering rapidly to long finger­like, distally projecting medial lobe. Hypd basodorsally with a disc-like projection that lies between gonocoxites.

Variation: The female paratype agrees well with the holotype, but is slightly bigger (wing length 4.7 mm) and stump-veins are moderately well developed.

Holotype: ♂ SOUTH ARICA: ‘ Sth Africa Cape Prov / Richtersveld 2816BD / 40km S of Ochta Mine / Londt & Stuckenberg / 2.ix.1983. Mixed Karoo / bush with few flowers’ ( NMSA).

Paratype: 1♀ same data as holotype ( NMSA) .

Distribution and phenology (Table 3): Known only from the type locality ( Fig. 68 View Fig ) and collected only in September.

Similar species: Male genitalia are similar to those of dorsalis , eremia , leukoros , and platygaster , but the form of the epandrium and hypandrium is distinctive. Identification of females of these species is sometimes problematic as they so closely resemble each other.


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