Hedychridium jacobsi Rosa, Proshchalykin & Halada, 2021

Rosa, Paolo, Proshchalykin, Maxim Yu. & Halada, Marek, 2021, Additions to the cuckoo wasps (Hymenoptera, Chrysididae) of Mongolia, with description of eleven new species, ZooKeys 1068, pp. 149-187 : 149

Hedychridium jacobsi Rosa, Proshchalykin & Halada sp. nov.

Figure 11A-G

Material examined.

Holotype: ♂, Mongolia: Dornogovi, 28 km SE of Chatan-Bulag , 2.VIII.2007, leg. MH (ZIN) . Paratypes: 6 ♀♀, 3 ♂♂, same data and locality of holotype, leg. MH, leg. PT (MHC, PRC, PTC) ; 1 ♀, 3 ♂♂, 65 km SE of Chatan-Bulag, 1020 m alt., 2.VIII.2007, leg. MH (MHC); Bayankhongor , 1 ♀, 3 ♂♂, 75 km S of Bayankhongor , 45°20'N; 100°48.5'E, 1330 m alt., 8-9.VII.2004, leg. JH, JS (MHC, PRC) .

Diagnosis.

Hedychridium jacobsi sp. nov. is characterised by legs and F1 yellowish, also in the male; F1 elongate (l/w = 3.0 in female, 4.0 in male); sculpture of scapal basin with sharp transverse ridges covering almost all face in frontal view; ridges on scapal basin may produce darkened to black effect on scapal basin when examined at different angles.

Description.

Male. Body length 4.0-4.5 mm (holotype 4.1 mm). Head. Face with scapal basin slightly deep; scapal basin with sharp, transverse ridges, almost reaching eye margin (Fig. 11E ); laterally with sparse punctures amongst ridges and single row of large punctures between facial ridges and eye margin; longitudinal mid-line incomplete, distinctly visible from upper scapal basin to clypeus; with large, subcontiguous punctures on brow and small punctures on vertex and temples; area in front of anterior ocellus and lateral to posterior ocelli depressed; ocellar triangle isosceles, without ocellar line; malar spaces micropunctate; clypeus apico-medially bordered by thin, brown rim; mandibles bidentate; mouthparts short, not exceeding the mandibles. Relative length of P:F1:F2:F3 = 1.0:1.6:1.0:0.7; OOL = 1.7 × MOD; POL = 2.0 × MOD; MS = 0.6 × MOD. Mesosoma. Pronotum with irregular punctures of different size, somewhere contiguous and with polished to corrugated interspaces; mesonotum with small punctures and wide interspaces, somewhere corrugated; punctures slightly larger at base of mesoscutum and distinctly larger at sides of mesoscutellum, medially with scattered punctures; posterior propodeal projections acute, divergent; metatibia with depression on inner side, as long as half of its length and only partially darkened; light brown metatarsomere 2 shorter than metatarsomere 3; pro-, mesopleuron and femora with long whitish setae. Metasoma. T1-T3 with minute, even and dense punctures on all surface; S2 with sparse, minute punctures bearing long setae; with large violet spot, covering about half segment; apical margin of T3 bordered by thin hyaline rim; genital capsule as in Fig. 11B . Colouration. Head and mesosoma metallic green with bronze to violet reflections dorsally; metasoma with rosy to violet reflections (possibly metallic red in nature); scape and pedicel bronze, F1 yellowish (Fig. 11D ); F2 brownish; rest of flagellum brown; tegulae non-metallic yellowish; femora joints yellowish, tibiae yellowish with slight greenish reflections on outer side of fore tibia; tarsi yellowish, brownish distally; wing membrane clear, nervures light brown.

Female. Body length 3.5-4.0. Similar to male in habitus and body sculpture; F1 slightly shorter than male, yellowish; spot on second metasomal sternum golden.

Paratypes. Males show variability in antennae colour, with F1-F2 pale yellowish; distribution of dark, black area amongst ridges on face (Fig. 11F ); punctures on pronotum, more or less spaced with polished interspaces; shape of posterior propodeal processes, more or less spiny rather than triangular.

Etymology.

The specific epithet Hedychridium jacobsi (masculine noun in genitive) is dedicated to Maarten Jacobs (Herentals, Belgium), for his contribution to the study of Chrysididae with superb images taken in nature and for providing some Mongolian specimens from his past naturalistic trips in the country.

Comparative diagnosis.

We describe Hedychridium jacobsi sp. nov. in the Hedychridium femoratum species group. It is related to H. femoratum and other species in this group for its general habitus, yellowish legs and F1. It is separated from other species of this group by elongate F1 (l/w = 3.0 in female, 4.0 in male) (Fig. 11D ); yellowish F1 in male (brown like other flagellomeres in other species); unique sculpture of scapal basin with sharp transverse ridges covering almost all face in frontal view; ridges on scapal basin produce a unique darkened to black effect on scapal basin, when examined at different angles (Fig. 11 E and F ).

Distribution.

Mongolia (Bayankhongor, Dornogovi).

Figures

Figure 11. Hedychridium jacobsi sp. nov., male, holotype (A-E, G); male, paratype (F) A habitus, dorsal view B genital capsule, ventral and dorsal view C habitus, lateral view D right antenna, lateral view E head, frontal view F head, frontal view; G metasoma, postero-lateral view. Scale bars: 1 mm.