Hylaeus (Deranchylaeus) aurantiacus, Dathe, 2023

Dathe, Holger H., 2023, New insights into the taxonomy of the Hylaeus xanthostoma complex and further additions to the African Hylaeus fauna (Hymenoptera, Anthophila, Colletidae), Contributions to Entomology 73 (1), pp. 67-93 : 67

publication ID	https://dx.doi.org/10.3897/contrib.entomol.73.e102655
publication LSID	lsid:zoobank.org:pub:77E4C420-0B01-49B8-B634-CAB943BD7397
persistent identifier	https://treatment.plazi.org/id/79F232B9-BF35-4A56-A374-D90912EE7C2C
taxon LSID	lsid:zoobank.org:act:79F232B9-BF35-4A56-A374-D90912EE7C2C
treatment provided by	by Pensoft
scientific name	Hylaeus (Deranchylaeus) aurantiacus
status	sp. nov.

Treatment

Hylaeus (Deranchylaeus) aurantiacus sp. nov.

Diagnosis.

Particularly, the female is conspicuous because of its long head accompanied by the extensive orange colouration of the face, which extends also to the supraclypeal area, the scapes, the paraorbital areae and lower areas of the head. The male morphologically closely resembles H. xanthostoma , but differs so markedly in the details of the terminalia (Figs 28 View Figures 28–37 , 29 View Figures 28–37 ) that they must be considered to be separate species.

Description.

Male. N = 1. Total length 4.2 mm, wing length 3.0 mm.

Head (Fig. 1 View Figures 1–9 ) in outline short trapezoidal; HL:HW 1.03, UFW:LFW 1.63; only very short and sparsely hairy. Scapes short, compact, barely dilated, ScL:ScW 1.95, mostly yellow, brown above. Flagella very long, yellow, slightly darker above. Foveae faciales placed very high, small. Mask bright sulphur-yellow, weakly shiny; lateral spots reach beyond scape bases, rounded to orbits; clypeus CL:CW 1.41, BW:DO 0.91; flat, distinctly convex only below, surface longitudinally wrinkled with distinct punctation; anterior margin quite narrowly horn-brown. Upper part of supraclypeal area black, shiny, with raised lateral margins, extended above into a broad apex gradually merging into frons. Lower frons grooved in scape area, laterally and above with strong contiguous punctation, arranged in rows of dots; surface shiny. Vertex highly convex, densely and strongly punctate in middle. Facial sides evenly convex, with rounded paraocular margin. Occiput rounded. Genae striate, shiny. Malae distinct, yellow-brown. Labrum and mandibles yellow.

Mesosoma (Fig. 10 View Figures 10–18 ) normal, black, hardly hairy. Tegulae yellow-spotted, pronotum with tiny pointed spot. Pronotum sharp-edged anteriorly, laterally protruding, angular. Mesonotum and scutellum finely shagreen, silky, with coarse subcontiguous punctation. Mesopleura similarly coarsely, but more shallowly punctate; omauli rounded. Legs black, with whitish-yellow on tibiae I anteriorly, II and III basally and apically; tarsi pale yellow, terminal segment dark. Wings clear, with stigma and veins brown, costa dark. Propodeum coarsely and sharply sculptured, medial area with coarse meshes, interspaces shiny. Terminal area ringed with upturned sharp bars, also coarsely sculptured, shiny; median furrow distinct. Lateral areae also delimited laterally.

Metasoma (Fig. 19 View Figures 19–27 ) slender and elongate, black. Tergum 1 shagreen with fine sparse punctation; following terga more indistinctly punctate, silky-glossy; depressions barely discernible. Tergum 1 with white lateral fringes. Sterna flat, without markings. Terminalia (Fig. 28 View Figures 28–37 ): genital capsule compact, elliptic in outline, dorsal view, gonoforcipes apically with rounded apex and long bristles. Penis valves narrow and shorter than gonoforcipes, dorsal view, but (unlike in H. xanthostoma ) highly convex (Fig. 44 View Figures 44–45 ). Sternum 7 distally with two long lamellar bristles and one short bristle basally; distal flag distinctly elongate and bearing three short bristles. Proximal lobes distally broadened like a spoon, bearing one slightly longer coarse bristle and rather many fine bristles. Sternum 8 apically short and broad, median cone placed far towards anterior, spiculum elongate.

Female. N = 1. Total length 5.3 mm, wing length 3.5 mm.

Head (Fig. 46 View Figures 46–51 ) outline conspicuously elongate, pear-shaped, HL:HW 1.06, UFW:LFW 1.41; hairless. Scapes long and slender, orange; flagella yellow below, darkened above, with margins of segments black. Foveae faciales moderately long. Colouration of upper half of head black, clypeus, paraocular areae and supraclypeal area orange, as also genae, malae, labrum and mandibles; only tips of mandibles black. Clypeus CL:CW 1.22, BW:DO 1.48; shallowly impressed area in middle, longitudinally grooved with relatively large shallow punctate pits, silky-glossy. Supraclypeal area similarly sculptured, with raised lateral margins, without median furrow; broad above, merging gradually into frons. Frons with strong subcontiguous rows of dots, surface shiny. Vertex convex, punctation slightly finer and shallower. Sides of face evenly convex, with partly sharp-edged paraocular margin. Genae bevelled, longitudinally wrinkled. Malae dilated. Occiput rounded.

Mesosoma (Fig. 52 View Figures 52–57 ) elongate and depressed, black, with sparse white bristles below. White spots only on tegulae. Pronotum with sharp anterior edge, sides pointedly protruded. Mesonotum, mesopleura and scutellum shagreen, silky, with strong close punctation. Omauli almost angular. Legs black, only posterior tarsi brown and anterior tibiae and tarsi yellow. Wings clear, with stigma and veins dark brown. Propodeum sharp-edged, medial area basally with fine wrinkles, distally with coarse sharp-edged meshes, interspaces shiny. Terminal area circular with sharp bar, medial groove broad, smooth, sculptured and dull above. Lateral areae sharply delimited posteriorly and laterally, with few white pinnae.

Metasoma (Fig. 58 View Figures 58–63 ) spindle-shaped, black, weakly shiny. Tergum 1 finely shagreen, punctation very minute, but relatively dense compared to H. xanthostoma (Fig. 59 View Figures 58–63 ); following terga equally finely sculptured, but punctation nearly disappearing; depressions poorly defined. With distinct white lateral fringe. Terminal fringe pale.

Type material.

Holotype ♀, ETHIOPIA: Sidamo prov., 40 km W Sodo, 1130 m alt., 12.IV.2007. - Paratype ♂, same collection data. Both leg. J. Halada et coll. OLML.

Etymology.

Adjective: aurantiacus (lat.) - red-orange, orange-red.