Dirhinus quadrhinus, Delvare & Copeland, 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 : 326

publication ID

https://doi.org/ 10.11646/zootaxa.4374.3.1

publication LSID

lsid:zoobank.org:pub:82E74B47-94C6-47A7-8CDB-477A84B55837

DOI

https://doi.org/10.5281/zenodo.5970455

persistent identifier

https://treatment.plazi.org/id/03C97E04-EA00-FFB4-CA86-41FEFA20AFCA

treatment provided by

Plazi

scientific name

Dirhinus quadrhinus
status

 

Key to species of the quadrhinus species group of Dirhinus

1 Body with extremely long setae on labrum, mandibles, gena posteriorly, pronotal collar laterally, propodeum laterally, adscrobal area of mesepisternum, metepimeron dorsally, procoxa (Fig. 120), metacoxa, and pro- and metafemora on outer side (Fig. 124). In dorsal view, distance separating median ocellus from end of scrobal depression about as large as ocellus diameter (Fig. 121).................................................................. D. gigasetosus Delvare sp. nov.

- Body without such outstanding setation, the setae always shorter ( Figs 112 View FIGURE 112 , 141 View FIGURES 141–147 , 148 View FIGURES 148–156 ). Distance separating ocellus from end of scrobal depression much greater than ocellus diameter ( Figs 114 View FIGURES 113–118 , 133, 142, 150).................................... 2

2(1) Frons without preorbital ridge ( Figs 149, 151 View FIGURES 148–156 ). Dorsal surface of petiole less transverse than in alternate, about 1.5× as wide as long. Pedicel relatively short, 1.67× as long as wide. In dorsal view, inner edges of inner pair of horns diverging at an angle of about 30° ( Fig. 150 View FIGURES 148–156 ), and apex of inner horn extending beyond that of outer horn.......... D. leakeyorum Delvare sp. nov.

- Frons with preorbital ridge ( Fig. 115 View FIGURES 113–118 ). Dorsal surface of petiole more transverse than in alternate, 2.15–2.25× as wide as long ( Figs 118 View FIGURES 113–118 , 138, 146). Pedicel at least 2× as long as wide ( Figs 116 View FIGURES 113–118 , 134). In dorsal view, inner edges of inner pair of horns diverging at a more acute angle (about 20°) ( Fig. 114 View FIGURES 113–118 ), or apex of inner horn not exceeding that of outer horn............. 3

3(2) Median ocellus more distant from end of scrobal depression than in alternate, e.g. in dorsal view inner horn length (IHL, Fig. 6 View FIGURES 3–8 ) 1.44× as long as distance from median ocellus to end of scrobal depression ( Fig. 114 View FIGURES 113–118 ). Inner edges of inner pair of horns diverging at an angle of about 20°. Apex of inner horn extending past that of outer horn. Submedian carinae on dorsal surface of petiole diverging posteriorly.................................................. D. quadrhinus Delvare sp. nov.

- Median ocellus less distant from end of scrobal depression, e.g. in dorsal view IHL 1.65–2.29× as long as distance from median ocellus to end of scrobal depression (Figs 133, 142). Inner edges of inner pair of horns diverging at an angle of about 30°. Apex of inner horn not exceeding that of outer horn. Submedian carinae on dorsal surface of petiole, when visible, slightly converging posteriorly................................................................................. 4

4(3) Dorsal surface of petiole strongly sloping backwards (Fig. 139) and with distinct submedian carinae delimiting a median sulcus (Fig. 138). Strigose surface on first gastral tergite mostly smooth between the longitudinal ridges (Fig. 140). IHL 1.65× as long as distance from anterior edge of median ocellus to end of scrobal depression (Fig. 133)... D. kambae Delvare sp. nov.

- Dorsal surface of petiole hardly sloping and with vestigial submedian carinae, hence median grove absent ( Fig. 146 View FIGURES 141–147 ). Strigose surface on first gastral tergite reticulate between longitudinal ridges anterolaterally ( Fig. 147 View FIGURES 141–147 ). IHL 2.29 × as long as distance from anterior edge of median ocellus to end of scrobal depression ( Fig. 142 View FIGURES 141–147 )................ D. maasaii Delvare sp. nov.

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Hymenoptera

Family

Chalcididae

Genus

Dirhinus

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