Hylaeus (Deranchylaeus) lyriformis, 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

Hylaeus (Deranchylaeus) lyriformis sp. nov.

Diagnosis.

The striking and unique character is the excessive development of the distal lobus of the S7, which is lyre-shaped. The black scape with clearly demarcated apex spot is reminiscent of H. promontorii , but the gonoforcipes of the genital capsule are much moreslender. The mask is bright lemon yellow. The female is unknown.

Description.

Male. N = 2. Total length 4.3-4.4 (4.35) mm, wing length 2.9-3.1 (2.98) mm.

Head piriform (Fig. 5 ); HL:HW 1.04-1.05 (1.05), UFW:LFW 1.63-1.69 (1.66); only posteriorly hairy. Scapes short, compact, little expanded distally, ScL:ScW 1.68-1.73 (1.70); black with whitish-yellow apical spot. Antennal flagella long, segments weakly saw-like, nodular distally, about twice as long as wide, yellow, darkened above. Foveae faciales absent. Mask pale yellow, weakly shiny; lateral spots extending above scape bases, tongue-like; clypeus CL:CW 1.46-1.50 (1.48), BW:DO 0.79-0.84 (0.82); surface finely shagreen, punctation shallow and scattered, barely visible amongst sculpture; anterior margin narrowly horn-brown. Supraclypeal area with raised lateral margins, without dots above, extended into a point gradually merging into frons. Frons with scape fields grooved, outwardly and above wrinkled stripes of punctures, to median ocellus with separated dots; surface shiny. Vertex highly convex, shallowly punctate in middle. Facial sides evenly convex, with rounded paraocular margin. Occiput rounded. Genae striate, shiny. Malae distinct, horn-brown. Labrum and mandibles light yellow like mask.

Mesosoma (Fig. 14 ) normal, black, hardly hairy. Only tegulae yellow-white marked, calli and pronotum black. Pronotum slightly prolongated, anterior edge sharp, laterally angular. Mesonotum and scutellum shagreen, dull, with coarse dense punctation. Mesopleura less strongly and more shallowly punctate; omauli rounded. Legs black, with white colouration on tibiae I anteriorly, II and III basally and apically; basitarsi and other tarsomeres entirely pale. Wings clear, with stigma brown, costa and veins dark brown. Propodeum coarsely and sharply sculptured, medial area with coarse meshes, interspaces shiny. Terminal area bordered by upturned sharp ridges, also coarsely sculptured, shiny; median furrow distinct. Lateral areae also delimited laterally.

Metasoma (Fig. 23 ) slender and elongate, black. Tergum 1 shagreen, with sparse to close minute punctation; following terga more finely and shallowly punctate, silky glossy; depressions defined. Tergum 1 without lateral fringes. Sterna planar, indistinctly punctate, shiny. Terminalia (Fig. 30 ): genital capsule similar to H. promontorii , gonoforcipes long and flattened, but narrower and distinctly longer than penis valves; sides with graded hair crest. Sternum 7 characteristic (Fig. 42 ): lobes almost circular in outline, distal part strongly elongate and broadened ( “flag”), its surface covered with 8 to 10 short bristles; basal part narrower and shorter, bearing four lamellar bristles and other short bristles, giving the shape of a “lyre”. Sternum 8 with raised keel, spiculum elongate and curved.

Type material.

Holotype ♂, ETHIOPIA: Sidamo prov., near Bitata, 1480 m alt., 27.IV.2007, J. Halada leg.; coll. OLML. - Paratype: 1 ♂, ETHIOPIA S: Sof Umer, 06°54'N, 40°51'E, 1200 m alt., 30-31.V.2015, J. Halada leg.; coll. SDEI.

Etymology.

New Latin, from lyra (lute, lyre) + forma (form, shape) - shaped like a lyre (adjectival).

Figures

Figures 1 - 9. Hylaeus (Deranchylaeus) species, males. Head, frontal view. 1. H. (D.) aurantiacus sp. nov.; 2. H. (D.) xanthostoma (Alfken); 3. H. (D.) burundis sp. nov.; 4. H. (D.) promontorii (M. - W.); 5. H. (D.) lyriformis sp. nov.; 6. H. (D.) sambiensis sp. nov.; 7. H. (D.) portokalius sp. nov.; 8. H. (D.) venustus Dathe; 9. H. (D.) diastictus sp. nov. Scale bar 0.5 mm.

Figures 10 - 18. Hylaeus (Deranchylaeus) species, males. Mesosoma, dorsal view. 10. H. (D.) aurantiacus sp. nov.; 11. H. (D.) xanthostoma (Alfken); 12. H. (D.) burundis sp. nov.; 13. H. (D.) promontorii (M. - W.); 14. H. (D.) lyriformis sp. nov.; 15. H. (D.) sambiensis sp. nov.; 16. H. (D.) portokalius sp. nov.; 17. H. (D.) venustus Dathe; 18. H. (D.) diastictus sp. nov. Scale bar 0.5 mm.

Figures 19 - 27. Hylaeus (Deranchylaeus) species, males. Metasoma base, dorsal view. 19. H. (D.) aurantiacus sp. nov.; 20. H. (D.) xanthostoma (Alfken); 21. H. (D.) burundis sp. nov.; 22. H. (D.) promontorii (M. - W.); 23. H. (D.) lyriformis sp. nov.; 24. H. (D.) sambiensis sp. nov.; 25. H. (D.) portokalius sp. nov.; 26. H. (D.) venustus Dathe; 27. H. (D.) diastictus sp. nov. Scale bar 0.5 mm.

Figures 28 - 37. 28 - 36. Hylaeus (Deranchylaeus) species, males. Terminalia. 28. H. (D.) aurantiacus sp. nov.; 29. H. (D.) xanthostoma (Alfken); 30. H. (D.) lyriformis sp. nov.; 31. H. (D.) promontorii (M. - W.); 32. H. (D.) portokalius sp. nov.; 33. H. (D.) burundis sp. nov.; 34. H. (D.) sambiensis sp. nov.; 35. H. (D.) venustus Dathe; 36. H. (D.) diastictus sp. nov. 37. Hylaeus (Pumilaeus) soukontouai sp. nov., terminalia. Rows: A. Genital capsule; B. Sternum 8; C. Sternum 7. Scale bar 0.5 mm.

Figures 38 - 43. Hylaeus (Deranchylaeus) species, males. Sternum 7, visualisation in transmitted light microscope with phase contrast. 38. H. (D.) promontorii (M. - W.); 39. H. (D.) portokalius sp. nov.; 40. H. (D.) tenuis (Alfken); 41. H. (D.) venustus Dathe; 42. H. (D.) lyriformis sp. nov.; 43. H. (D.) sambiensis sp. nov. Scale bar 0.5 mm.