Dirhinus leakeyorum Delvare, 2018

Delvare, Gérard & Copeland, Robert S., 2018, Four-horned wasps, description of some remarkable Dirhinus (Hymenoptera, Chalcididae) from Kenya, with a discussion of their taxonomic placement, Zootaxa 4374 (3), pp. 301-349 : 337-343

publication ID	https://doi.org/ 10.11646/zootaxa.4374.3.1
DOI	https://doi.org/10.5281/zenodo.5970492
persistent identifier	https://treatment.plazi.org/id/03C97E04-EA3D-FF87-CA86-4321FF49AD5B
treatment provided by	Plazi
scientific name	Dirhinus leakeyorum Delvare
status	sp. nov.

Treatment

Dirhinus leakeyorum Delvare sp. nov.

( Figs 39 View FIGURES 31–42 , 84 View FIGURES 76–84 , 148–156 View FIGURES 148–156 ) ( Tables 3 and 4)

Registered in ZooBank, http://zoobank.org/Nomenclatural acts/F8150591-39AC-401F-89BB-6BE65BFB26D0

Material examined. Holotype ♀. KENYA: Eastern Province, base of Ukasi Hill , 613 m, 0.82103°S 38.54443°E, Malaise trap, Acacia-Commiphora savannah, 01-06.I.2012, R. Copeland leg. [F08] [ NMK]. GoogleMaps

Condition of holotype. Specimen complete, glued on rectangular card. Left wings, mid and hind leg glued separately.

Etymology. This species is dedicated to the family Leakey, Mary, Louis, their son Richard and his wife Meave for their significant contribution to the knowledge of human origins and, concerning Richard, for his efforts to protect the natural spaces of Kenya.

Description of female holotype. Body length 3.05 mm ( Fig. 148 View FIGURES 148–156 ). Identical with D. quadrhinus except as follows.

Head 0.93× as wide as long and 0.89× as wide as high; eye 1.29× as long as high; temple 0.65× as long as eye. In dorsal view, apex of inner horn extending past that of outer one. IHL 1.48× as long as distance from end of scrobal depression to median ocellus and 1.44× as long as ocular-ocellar distance; inner edges of inner horns diverging at an angle of 30° ( Fig. 150 View FIGURES 148–156 ). Frontovertex 2.74× as wide as IHL. Distance between lateral ocelli 1.44× as long as inter-ocellar distance. Frons without preorbital ridge ( Fig. 149, 151 View FIGURES 148–156 ). Mandible with 4 long setae in each groove. Clypeus with one long proclinate seta on each side ( Fig. 151 View FIGURES 148–156 ).

Antenna ( Fig. 152 View FIGURES 148–156 ). Combined length of pedicel plus flagellum 0.94× as long as head width. Pedicel 1.67× as long as wide. Second flagellomere 0.75× as long as wide, 8th segment 0.61× as long as wide and 1.64× as wide as 2nd segment.

Mesosoma 1.55× as long as wide with mesoscutellum 0.90× as long as wide. Lateral panel of pronotum coarsely and irregularly punctured. Propodeum with anteromedian areola shorter than wide without median carina inside; no median carina following it ( Fig. 155 View FIGURES 148–156 ); no secondary areolation on sublateral areolae, only folds visible. Upper crests on femoral groove of mesepisternum faint anteriorly. Metatibia with 10 short and adpressed setae in 2 rows along outer edge of tarsal sulcus ( Fig. 153 View FIGURES 148–156 ). Fore wing 2.58× as long as wide; marginal vein 0.74× as long as costal cell ( Fig. 154 View FIGURES 148–156 ). Marginal cell with 13 setae, some of which are distributed in a row in front of Rs.

Metasoma. Petiole with dorsal surface 0.64× as long as wide, rising strongly upwards and emarginate anteriorly, its sides diverging weakly posteriorly; petiole with distinct submedian carinae which delimit a median sulcus ( Fig. 156 View FIGURES 148–156 ). Gaster short, 1.86× as long as wide. First tergite 0.68× as long as gaster, with 6 primary and 12 secondary longitudinal ridges on strigose surface. Posterior margins of tergites 2–4 straight.

Male. Unknown.

Diagnosis. Preorbital ridge absent. Inner horns only moderately long with their inner edges forming an angle of 30°. Pedicel short. Petiole strongly sloping backwards and with distinct submedian carinae delimiting a median sulcus. Gaster somewhat shorter than mesosoma.

Recognition. This species may be recognized by the absence of the extremely long setae found in D. gigasetosus ; preorbital ridge absent (present in the other species without long setae); inner edges of inner horns diverging at an angle of 30° (18° in D. quadrhinus ); pedicel shorter than the other species without very long setae on body; flagellum somewhat more clavate than other species; dorsal surface of petiole sloping strongly backwards ……continued on the next page with a distinct submedian carinae delimiting a median sulcus (submedian carinae and median sulcus absent in D. maasaii ).

Distribution. The species is known only from its type locality, in Kenya. Host (s). Unknown, but probably Diptera based on the behaviour of other species in the subfamily to which it belongs.