Arpactophilus nyelayu, Breitkreuz, Laura C. V., Ohl, Michael & Engel, Michael S., 2016

Breitkreuz, Laura C. V., Ohl, Michael & Engel, Michael S., 2016, A review of the New Caledonian Arpactophilus (Hymenoptera: Crabronidae), Zootaxa 4063 (1), pp. 1-66 : 38-40

publication ID	https://doi.org/ 10.11646/zootaxa.4063.1.1
publication LSID	lsid:zoobank.org:pub:80401ED8-C6BA-4420-9109-854C5CC1E88D
DOI	https://doi.org/10.5281/zenodo.6088331
persistent identifier	https://treatment.plazi.org/id/03E4FF4A-FFBC-FFE4-3FB9-FC60C394FDA8
treatment provided by	Plazi
scientific name	Arpactophilus nyelayu
status	sp. nov.

Treatment

Arpactophilus nyelayu View in CoL sp. nov.

( Figs. 12 View FIGURES 10 – 15 , 81–82 View FIGURES 77 – 82 )

Diagnosis. Arpactophilus nyelayu is the only New Caledonian species in the genus with the combination of a distinctly elevated ridge on the midventral line ( Fig. 12 View FIGURES 10 – 15 ) and a well-delimited dark brown area on the metatibia (as in Fig. 8 View FIGURES 5 – 9 ).

Description. FEMALE: Total length 5.4 mm; forewing length 3.2 mm.

Body black, with areas of dark yellow and brown. Dark yellow: palpi; scape; apical margin of pronotal lobe; trochanters; femora apically and basally; tibiae, except apical area on metatibia; tarsi. Brown: pedicel; flagellum; anterior pronotal margin; tegula; coxae; most of femora. Mandible reddish-black. Wings hyaline; pterostigma dark brown.

Head about 1.1 × as long as wide in frontal view. Apical margin of clypeus strongly projecting medially, medioapical margin nearly straight ( Fig. 81 View FIGURES 77 – 82 ). Apical margin of labrum projecting medially, medioapical margin nearly straight. Ventral mandibular tooth about ¼–1/5 of total mandibular length, not reaching opposite mandibular base. Palpal formula 5:4. Frons colliculate and finely reticulate with a carina parallel to inner compound eye margin ( Fig. 81 View FIGURES 77 – 82 ) and dense short setae. Frontal carina present from median ocellus to midlength of clypeus, forming a flat point at basal clypeal margin. Scape 3.4 × as long as wide. Ocellar triangle anterior of tangent between upper posterior orbits of compound eyes, lateral ocelli anterior of tangent by more than their diameter. Occipital carina interrupted dorsally ( Fig. 6 View FIGURES 5 – 9 ). Gena imbricate with sparse punctation and associated setae, without tubercles, spines, or dorsoventral carina. Hypostomal midventral line carinate, faint anteriorly, strongly angulate medially ( Fig. 12 View FIGURES 10 – 15 ), with bordering short transverse carinulae on hypostomal integument.

Mesosoma about 1.7 × as long as wide in dorsal view. Propodeum about 0.8 × as long as wide in dorsal view. Mesosoma imbricate with dense punctation ( Fig. 82 View FIGURES 77 – 82 ), except on dorsal surface of propodeum; lateral surface of propodeum also transversely carinulate; dorsal surface of propodeum coarsely reticulate (similar to pattern in Fig. 18 View FIGURES 16 – 22 ). Pitted sulcus present posterior to mesoscuto-mesoscutellar sulcus. Hypersternal sulcus absent. Metafemur 2.6 × as long as wide. Metatibia with a well-delimited dark brown, flattened area apically. Pretarsal claws without teeth. Forewing with two submarginal cells; anterior border of submarginal cell II slightly shorter than posterior border. Hind wing with five distal hamuli.

Metasoma polished, punctation sparse ( Fig. 82 View FIGURES 77 – 82 ). Metasomal sternum II swollen medially, forming bulge (as in Fig. 2 View FIGURES 1 – 4 ). Pygidium with broad row of silk setae.

MALE: Unknown

Remarks. Arpactophilus nyelayu is similar to A. kumak , A. vamale , A. numee , A. xaragure , A. orowe , A. pwapwa , and A. arboreus as all share the combination of a dark brown or black metasoma with a bulge on the metasomal sternum II and a dark brown or black clypeus with a medially strongly projecting apical margin that has no or only a small incision medially. See remarks-section of A. kumak .

Material examined. HOLOTYPE ♀: “ NEW CALEDONIA 12074: 22°19’S x 166°55’E, 480m, Foret Nord, site 1. 22 Dec 2004– 9 Jan 2005. Burwell, Wright. Malaise, rainforest” [QM].

Etymology. The specific epithet is taken from the name Nyelâyu , one of the New Caledonian native languages. It is treated as a noun in apposition.