Dirhinus neoclaviger, Narendran, T. C. & van Achterberg, Cornelis, 2016

Narendran, T. C. & van Achterberg, Cornelis, 2016, Revision of the family Chalcididae (Hymenoptera, Chalcidoidea) from Vietnam, with the description of 13 new species, ZooKeys 576, pp. 1-202 : 71-75

Taxon classification Animalia Hymenoptera Chalcididae

Dirhinus neoclaviger sp. n. Figs 83, 84-85

Type material.

Holotype, ♀ (RMNH), "Vietnam: Ninh Thuân, Núi Chúa N. P., 90-150 m, Northeast part, 23-30.v.2007, C. v. Achterberg & R. de Vries, RMNH’07”.

Diagnosis.

This new species resembles Dirhinus claviger Bouček & Narendran by the shape of the antenna, but differs from it in having: 1) anterior margin of frontal horns transverse and not notched (in Dirhinus claviger anterior margin of each frontal horn notched and not transverse); 2) frontal horns relatively shorter than any of the Oriental species of Dirhinus ; 3) mesoscutum and scutellum densely punctate without any broad smooth areas (in Dirhinus claviger with broad smooth areas present on scapulae and scutellum and punctures sparse in middle of mesoscutum); 4) distance between setigerous punctures on outer surface of hind femur not greater than breadth of third hind tarsal segment (in Dirhinus claviger distance between punctures on hind femur slightly greater than breadth of third hind tarsal segment); 5) striate area of T1 very much reduced in between outermost carinae (in Dirhinus claviger striate area of T1 not so reduced between outermost carinae but quadrate) and 6) apex of scutellum with a tooth-like protuberance (in Dirhinus claviger no such protuberance present at apex of scutellum).

This new species resembles Dirhinus himalayanus Westwood in having frontal horns without notch at apex, but differs from it in having frontal horns with transverse anterior margin (in Dirhinus himalayanus frontal horns rounded at anterior margin); 2) frontal horns relatively short (in Dirhinus himalayanus frontal horns longer); 3) mesoscutum and scutellum without impunctate broad area (in Dirhinus himalayanus mesoscutum and scutellum sparsely punctate); 4) antenna with micro-pilosity on clava (in Dirhinus himalayanus antennal clava without micro-pilosity), 5) T1 without strong basal carinae (in Dirhinus himalayanus T1 with strong basal carinae) and 6) apex of scutellum with a tooth-like protuberance (in Dirhinus himalayanus apex of scutellum rounded without protuberance).

Description.

Holotype, ♀, length of body 4.1 mm.

Colour. General body colour black; scape, pedicel and anellus pale brownish yellow; F1 pale brown; remaining segments black; eye and ocelli pale reflecting yellow; trochanters, femora and tibiae of fore and mid legs pale brownish yellow; fore tarsus pale brownish yellow; all coxae, hind trochanter, hind femur and hind tibia black; tegula pale yellow; wings hyaline; veins brown.

Head. Head in dorsal view with sides distinctly though moderately converging behind eyes; eyes clearly longer than temples; ocellar area distinctly elevated; each horn extremely small, its length from hind ocellus 2.8 × width of anterior margin of horn; anterior margin of each horn transversely margined, notch or teeth absent; each horn as broad as scrobal gap at its basal third; pre-orbital carina noticeable but blunt; facial edge of scrobes in lateral view only weakly sinuate. Antenna short strongly clavate; clava slightly longer than broad and on one side (facing anteriorly when antenna folded into scrobe) with large, round flat area of micro-pilosity; all flagellar segments transverse, F1 very slightly so; width of base of clava a little over 4 × length of basal segment of clava; pedicel about as long as F2 and F3 combined.

Mesosoma. Mesosoma not depressed, with close, setigerous punctate, interstices narrower than diameter of a puncture, rugulose or faintly reticulate; no smooth area on scapula and scutellum; pronotum in median line not depressed, sides hardly converging forward; scutellum including apical tooth-like protuberance very slightly longer than broad (12:10); relative length of tooth-like protuberance 0.2 × width of scutellum; propodeum with median areola nearly round, as long as broad; adcoxal lateral tooth of metapleuron slightly less than 90°.

Wings. Wing pubescence denser on distal half than on proximal half, setae relatively short; PMV absent.

Legs. Hind femur 1.4 × as long as broad, outer disc with dense setigerous shallow micro-pits, basal tooth of comb of teeth prominent; hind tibia with weak external carina extending over more than half length towards knee, area between this carina and tarsal sulcus flat, narrower than that of Dirhinus himalayanus , partly blurred by setigerous punctures.

Metasoma. Petiole a little wider than long (11:8), slightly diverging posteriorly, anterior margin not emarginated in middle area, with 5 carinae, area of carinae as long as broad; striate area of T1 with irregular length and very short carinae basally except the outermost one on either side (which are shorter than the width between them (3:5)), carinae not subquadrate; median short carinae 0.1 × length of T1; length of outermost lateral carinae 0.3 × length of T1; hind margin of T1 slightly arcuate; T1 shiny, mostly smooth with micro-sculptured on either side before apex.

Male. Unknown.

Host.

Unknown.

Etymology.

Named after Dirhinus claviger Bouček & Narendran because the shape of the antenna is similar.