Ancylorhynchus dilobion Londt 2011, sp. n.
Creators: name: Londt, Jason G. H.
Publisher: name: Zenodo
Year: 2011
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Asilidae
Ancylorhynchus
Ancylorhynchus dilobion

description: Ancylorhynchus dilobion sp. n.   Figs 4, 33, 67–69  
 Etymology: From Greek di­ (two, dis) and lobion (a small rounded protuberance). Males of the species possess a pair of small rounded lobes on the distal margin of the hypandrium.   
Description:  
 Male (based on holotype. Condition: Excellent; thorax slightly greasy).   
 Head: Dark red-brown to blackish, silver pruinose, mainly dark red-brown setose. Antenna (Fig. 4): Scape and pedicel dark red-brown, dark red-brown setose, postpedicel orange-brown proximally becoming dark red-brown distally, terminal stylus ‘segment’ present, tipped with obliquely situated pit-enclosed spine-like sensory element. Segmental ratios: 1:0.3:3.3:0.3. Face blackish, uniformly silver pruinose (weakly so on lateral parts of epistomal margin), mystax blackish occupying ventral ¾ of face (weakly dorsally). Frons and vertex blackish, fine silver-grey pruinose, dark red-brown to black setose; ocellar tubercle fine blackish setose (no macrosetae). Occiput blackish, uniformly fine silver-grey pruinose, dorsal setae mainly brown-orange setose, all other setae dark red-brown to blackish. Palpus dark red-brown, blackish setose, terminal palpomere swollen, apex with terminal sensory pit. Proboscis dark red-brown (proximally a little paler), blackish setose.   
 Thorax: Blackish with orange areas dorsally, fine dull silver-grey pruinose, dark red-brown and brown-orange setose. Prothorax: Anterior antepronotum orange, posterior antepronotum dark red-brown with some orange areas dorsally, fine silver-grey pruinose, dark red-brown setose. Mesonotum blackish except for orange postpronotal and postalar lobes (and immediate surrounding areas), fine silver-grey pruinose, fine short dark red-brown setose. Mesonotal macrosetae (orange when present): dc tiny dark red-brown setae confined to area posterior to transverse suture, 2 npl, 1 spal, 2 pal. Scutellum entirely orange, fine silver pruinose, disc sparsely dark red-brown setose, hind margin with 5 brown-orange macrosetae accompanied by minor setae. Pleura entirely blackish, entirely silver-grey pruinose, setae dark red-brown confined to anepst, kepst and ktg. Anatg and mes pnot blackish, contrasting with orange scutellum. Legs: cx blackish, silver pruinose, cx 1&2 black setose cx 3 white setose; tro blackish (tro 2 without obvious ventral setae); fem 1&2 blackish except for orange distal ends, fem 3 mostly orange with central parts dark red-brown dorsally and ventrally, tib and tar entirely orange, major setae orange or dark red-brown minor setae white or pale yellowish, claws dark red-brown with orange proximal parts. Wings (Fig. 33): 6.6× 2.6 mm. Veins brown. Membrane pale brown, extensively microtrichose (small parts of some proximal cells partly bare). Haltere orange with brown stalk.   
 Abdomen: Predominantly blackish, most segments with narrow orange posterior margins, silver-grey pruinose, white and dark red-brown setose. T1 blackish, dull pruinose, longish white setose, T2 dark red-brown with narrow orange-brown posterior margin, strongly silver pruinose posterolaterally, mainly white setose (some small dark red-brown setae present laterally); T3–6 dark red-brown with narrow brown-orange posterior margins, strongly silver pruinose posterolaterally, short dark red-brown setose; T7 red-brown, fine silver-grey pruinose, dark red-brown setose; terminalia orange-brown. Sternites similar to tergites, but all setae short dark red-brown.   
 Genitalia (paratype, Figs 67–69): Epand bifid, forming pair of relatively short, straight slender lobes that project beyond all other genital structures. Lobes closely abut proximally, lie parallel with one another, distal parts slightly inwardly curved. Proct simple, dorsally situated cerc appearing fused proximally. Goncx well developed, outer lobe with ventral flange-like structure clearly evident; dorsal finger-like process reduced to a setose, broadly rounded bump; inner lobe well developed, distal end sclerotised, medially directed. Gonst laterally compressed, dorsally directed, tip curved anteriorly. Hypd well developed, somewhat wider than long, tapering fairly rapidly to broad somewhat truncate distal end; distal end with pair of fairly widely separated, small distal protuberances. Aed sub-triangular in shape with tiny bifid distal tip.   
 Female. Similar to male, orange parts of mesonotum more extensive, fem 3 entirely orange.   
 Variation: A remarkably consistent species, the extent of dark red-brown coloration of fem 3 is, however, somewhat variable.   
Holotype: ♂ SOUTH AFRICA: ‘ Paleisheuwel [32°28'S: 18°43'E] / C.P.’ ~ ‘Mus. Exp., Nov. 1948 ’ (SAMC). Paratypes: SOUTH AFRICA: 2♂ 1♀ 1? same data as holotype (SAMC); 1♂ ‘Bulhoek [31°47'S: 25°06'E] / Klaver-Clanw.’ ~ ‘Mus., Expd., / Oct. 1950 ’ (SAMC).  
Distribution, phenology and biology: Known only from South Africa (Table 1). Adults have been collected in October and November (Table 2). The biology is unknown, but the two known localities are located in the Fynbos biome of the Western Cape Province of South Africa.  
 Similar species:A member of the reynaudii species-group with close similarities to gessi, variabilis and whiteheadi.
description: Published as part of Londt, Jason G. H., 2011, A review of Afrotropical Ancylorhynchus Berthold, 1827 (Diptera: Asilidae: Stenopogoninae), pp. 471 in African Invertebrates 52 (2) on pages 484-486, DOI: 10.5733/afin.052.0214, http://zenodo.org/record/7917250