Euchroeus armatus Rosa, Halada et Proshchalykin, 2022

Rosa, P., Halada, M. & Proshchalykin, M. Yu., 2022, A new species of Euchroeus Latreille, 1809 (Hymenoptera, Chrysididae) from Mongolia, with taxonomic notes on Central Asian species, Far Eastern Entomologist 467, pp. 1-10 : 4-7

Euchroeus armatus Rosa, Halada et Proshchalykin , sp. n.

https://zoobank.org/NomenclaturalActs/ B455AFAC-55FE-453F-A45E-0B29AE332C7D

Figs 1A–C , 2A–B , 3A–B

TYPE MATERIAL. Holotype: ♂, Mongolia: Sukhbaatar, 100 km SSW of Baruun-Urt, 1100 m, 30.VII 2007, leg. M. Halada ( MSNM). Paratypes: 1♂, Khentii , 100 km NE of Ondorkhaan, Kerulen River, 970 m, 22.VII 2007, leg. J. Halada ( PRC); 2♂, Dornod , 20 km W of Choibalsan, 48°01' N, 114°14' E, 800 m, 24.VII 2007, leg. M. Halada ( MHC); 1♂, Sukhbaatar, 100 km SSW of Baruun-Urt , 1100 m, 30.VII 2007, leg. M. Halada ( MHC).

DESCRIPTION. MALE. Length 7.0– 8.5 mm. (holotype full length 8.5 mm).

Head. Scapal basin concave; median stripe polished, with sparse, small punctures; scapal basin widely polished below frontal declivity, laterally micropunctate, covered with dense, short, silvery setae; frons prominent over scapal basin; transverse frontal carina sharp, straight, placed 2.0 × MOD in front of anterior ocellus; malar space elongated, 1.6 × MOD; punctation on frons, with small, dense to contiguous punctures; punctures larger on vertex, and laterally to posterior ocelli. OOL 2.6 × MOD; POL 2.2 × MOD; MS 1.6 × MOD; relative length of P:F1:F2:F3 = 1.0:1.5:1.0:1.0; subantennal space 2.5 × MOD. Mesosoma. Pronotum as long as scutellum; antero-median pronotal line wide and shallow, as long as ½ pronotal length; punctation irregular and contiguous with punctures of different size without polished or micropunctate interspaces; propleuron ventrally bearing bilateral, large, spiniform tooth; mesoscutum basally with punctures rounded to polygonal; mesoscutellum with slightly larger, similar punctures; metanotum with irregular and larger punctures; posterior propodeal projections divergent and basally evidently concave; mesopleuron with hardy visible episternal sulcus, formed by confluent punctures; wide scrobal sulcus formed by subrectangular foveae and subtended by anterior large, digitate tooth and posterior shorter tooth. Wings hyaline, unmodified.

Metasoma. Tergum I with double punctation and micropunctate interspaces; tergum II dorsally with smaller and denser punctation, laterally with wider polished interspaces; medial longitudinal carina slightly raised and formed by polished stripe with tiny dots; pit row of tergum III with deep pits; apical margin with irregular teeth; black spots on sternum II small, subsquare.

Colouration. Body entirely metallic blue with green reflections; tergum II with a basal, narrow, darker stripe, faint in some paratypes; tegulae metallic green; mandibles light brown medially, metallic green at base. Scape, pedicel and large part of flagellomere I metallic green, following flagellomeres blackish; legs metallic green, tarsi yellowish, becoming darker distally; sterna metallic green.

PARATYPES. Body size variable, from 7.0 to 8.5 mm; tergum II without basal, darker stripe; apical teeth on tergum III differently shaped, as in other members of the Euchroeus purpuratus species group.

FEMALE. Unknown.

DIAGNOSIS. Euchroeus armatus sp. n. is characterized by the elongate, spiniform processes on propleuron and antero-ventrally on mesopleuron ( Fig. 2A, B); the body blue coloured ( Fig. 1A ), with greenish reflections, without darker marks and bands; metasomal sculpture distinctly double on tergum I and with small and dense punctures on tergum II ( Figs 1B, C ). Euchroeus armatus sp. n. is separated from E. purpuratus (Fabricius) by the elongate clypeus ( Fig. 3A ); the elongate, spiniform process on propleuron and antero-ventrally on mesopleuron ( Fig. 2A ); by its colouration with metasoma without large darker bands, and different genital capsule ( Fig. 3B ). The male can be easily separated from the other two known Mongolian species by its body colouration (red colored as the female, with purple marks in E. mongolicus) or by its sculpture (with large, punctures in E. orientis Semenov, 1967 – see the pictures of the type specimen in Rosa et al., 2017a).

Euchroeus armatus sp. n. is similar to the Central Asian E. arenarius (Tarbinsky, 2000) for the spiny ventral process of propleuron, but it can be separated by the different shape of the lower mesopleuron, with spiny anterior tooth (digitate in E. armatus) and narrow, arched interval between the anterior and posterior tooth (with a distinct, wide and straight interval in E. armatus ).

ETYMOLOGY. The specific epithet armatus (= armed, masculine, adjective) refers to the spiniform processes on propleuron and mesopleuron.

DISTRIBUTION. Mongolia (Dornod, Khentii, Sukhbaatar).

Figures

Fig. 1. Euchroeus armatus sp. n., male, holotype. A – habitus, dorsal view; B, C – metasoma, postero-lateral view (B); dorsal view (C). Scale bar 1.0 mm.

Fig. 2. Euchroeus armatus sp. n., male, holotype (A, B), E. purpuratus (Fabricius, 1787) from Russia (C, D) and E. arenarius (Tarbinsky, 2000) from Central Asia (E, F). A, C – head and mesosoma, lateral view; B, D, F – mesosoma, lateral view; E – head, frontal view. Scale bar 1.0 mm.

Fig. 3. Euchroeus armatus sp. n., male, holotype (A, B) and E. purpuratus (Fabricius) from Russia (C, D). A, C – head, frontal view; B, D – genital capsule. Scale bar 1.0 mm.