Hylaeus (Cornylaeus) adamauanis, Dathe, 2015

Dathe, Holger H., 2015, Studies on the systematics and taxonomy of the genus Hylaeus F. (9) Supplement to the taxonomy and distribution of Afrotropical Hylaeus F. species (Hymenoptera: Anthophila, Colletidae), Beiträge Zur Entomologie = Contributions to Entomology 65 (1), pp. 9-26 : 15-17

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https://doi.org/ 10.21248/contrib.entomol.65.2.223-238

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scientific name

Hylaeus (Cornylaeus) adamauanis

spec. nov.

Hylaeus (Cornylaeus) adamauanis spec. nov.

Figures 5–9 View Figs 5–8 View Fig , 23 View Figs 22–25

Diagnosis: According to the male terminalia, this small species belongs clearly to H. (Cornylaeus). It differs in both sexes from the two previously known larger species of this subgenus in its bright legs, the ferruginous metasoma base and white axillae. The male has a narrow scape.

habitus. – Scale 2 mm.

Description: Male. – TL 5.2–5.6 (5.42) mm, WL 3.7–4.0 (3.86) mm.

Head. Proportions HL:HW 0.88–0.91 (0.89), UFW:LFW 1.31–1.40 (1.36), outline transverse trapezoid. Scapus brown, conoid, as wide as flagellum, SL:SW 1.88–2.49 (2.18); flagellum short, yellow, segments seamed brown, therefore appearing annulated. Mask bright yellow, clypeus laterally with extended black margins, so mask appears three-streaked. Foveae faciales short, visible as a smooth bar. Clypeus CL:CW 1.14–1.20 (1.17), silkily shining, with strong, scattered punctation. Supraclypeal area narrow, top tapering to a point. Pilosity on frons and vertex short, inconspicuous, punctation moderate, subcontiguous. Genae regular, middle occipital margin sharp, malar areas relatively wide, about equal to width of scapus. Labrum and mandibles light brown.

Mesosoma. Outline compact, pilosity dorsally short, sparse, white, ventrally and around metanotum long and erect. Coloration black, bright are line on pronotum, spots on calli and tegulae and anterior scutellar corners (axillae). Pronotum little expanded, with bright stripe; front edge rounded, dorsolateral angle blunt. Mesonotum shagreen, silkily shiny, with moderate, dense punctation; scutellum shiny, punctation more dispersed. Mesopleurae similarly sculptured to metanotum, but punctation more shallow. Sternum mediodistally with strong impression. Legs brown, somewhat brighter are tibiae basally, foretibiae frontally and tarsi. Wings brownish, venation brown. Propodeum rounded, shagreen and silkily shining; basal area only indistinctly delimited, without carina, surface basally with a row of stitches, distally with irregular ridges; terminal area without sharp edge, shallowly punctate, medial furrow deeply impressed.

Metasoma slender spindle-shaped; coloration black, base of T1 yellow brown. Sculpture of T1 finely striate, shiny, with moderate, sparse punctation, following terga similar; T1 with narrow white lateral fringes, T2 with loose rows of cilia on depression; S3 with flat, obtuse-triangular callosity. Terminalia of cornylaeus-type ( Fig. 23 View Figs 22–25 ). Genital capsule with compact gonoforcipes, penis valves slim; S8 with somewhat extended apical lobus, distal lobes of S7 sclerotized.

Female. – TL 5.92 mm, WL 4.47 mm.

Head. Proportions HL:HW 0.87, UFW:LFW 1.26, outline transverse elliptic. Scapus light brown; flagellum short, light brown. Mask ivory white, appearing three-striped: paraocular lines at reaching foveae, clypeus and supraclypeal area in middle with broad stripe. Fovea facialis long, distinct. Clypeus CL:CW 1.03, below with a triangular brown area, sculpture fine-grained, silkily shining, with strong, sparse to scattered punctation. Supraclypeal area narrowed above, shallowly merging to frons. Frons and vertex with subcontiguous coarse flat punctation. Genae and occiput regular; malar areas, labrum and mandibles brown as in male.

Mesosoma. Outline compact, slightly depressed; pilosity sparse, as in male. Coloration black, bright are pronotal stripe, calli, dots on tegulae and axillae at anterior edges of scutellum. Pronotum little expanded, dorsolateral angle blunt. Mesonotum and mesopleurae shagreen, silkily shining, with moderate, dense punctation, shallower on mesopleurae; scutellum shiny, punctation more scattered. Legs entirely light brown. Wings light brownish, venation brown. Propodeum rounded, matt, surface densely tomentose. Basal and terminal areas as described in male.

Metasoma slender spindle-shaped. T1 brown, other parts of metasoma with black coloration. Sculpture of T1 very finely shagreen, shiny, with minute, sparse punctation; the following terga similar. T1 and T2 with narrow white lateral fringes, terminal fringe yellowish.

Distribution: Cameroon.

Type material: 12 ♂, 1 ♀.

Holotypus: ♂ Cameroon: Adamaoua , Beka nr Ngaoundere 07°17'N 13°19'E, 24.07.1987; on Protea, A. Pauly lg. – In coll. RBINS GoogleMaps .

Paratypes: Cameroon: Adamaoua, Beka nr Ngaoundere, 07°17'N 13°19'E, 24.07.1987, 1 ♂ 1 ♀ GoogleMaps ; on Protea (same data as holotypus); Adamaoua: de Banyo à Tibati, 06°37'N 12°07'E, 26.07.1987, 1 ♂ GoogleMaps ; Adamaoua: Tékel, 06°47'N 13°10'E, 24.07.1987, 2 ♂; N Mayo-Darlé, 06°28'N 11°33'E, 23.07.1987, 2 ♂; all A. Pauly lg. Meiganga 06°33'N 14°15'E, 1103 m, 08.– 24.05.2014, 5 ♂, Y.B. Soukontoua lg. – In coll. RBINS, SANC, SDEI .

Flower visit: On flowers of Protea sp. ( Proteaceae ) and Harungana madagascariensis ( Hypericaceae ); all records by A. Pauly.

Derivatio nominis: The epitheton is an adjective and refers to the province Adamaoua in Cameroon.

Remarks: Two of the twelve males available for study possess the same conspicuous five tuberculate processes on the metasoma which are already known in Hylaeus (Cornylaeus) aterrimus . Here it led to the description of a junior synonym Prosopis quinquedentata FRIESE, 1911 , see also Fig. 18 View Figs 18–21 in SNELLING (1985: 11). This corresponds to the situation in H. adamauanis spec. nov. ( Fig. 9 View Fig ): T3 has two lateral cone-shaped pegs, and the base of S3 is transversely depressed to form a shiny, welldefined plate whose distal margin bears processes at three points. These structures are frequently only developed in outlines. According to Snelling, the different degrees of development of the processes fall well within the range of variation of H. aterrimus , as he understood the species. The available material of the new species is not very extensive, but shows no continuous transition between a morph with missing processes and that in which these are well developed. Observations on the biological function of these remarkable structures would therefore be desirable.


Royal Belgian Institute of Natural Sciences


Agricultural Research Council-Plant Protection Research Institute