Pseudozumia cucphuongensis, Nguyen, 2020

Nguyen, Lien Thi Phuong, 2020, Taxonomic study on the genus Pseudozumia de Saussure (Hymenoptera: Vespidae Eumeninae) from Vietnam, with description of a new species, Zootaxa 4790 (3), pp. 586-592 : 587-590

Pseudozumia cucphuongensis sp. nov.

(Figs 1–10)

Diagnosis. This species can be distinguished from the five Oriental known species of the genus Pseudozumia by following combination of features: propodeal carina angulated at lateral corner before getting to dorsal part; tergum I gradually widening from base to apex, with node at lateral two-fifth from base, in dorsal view about 1.4 × as long as wide at apical margin, with longitudinal striation on dorsal part weakly developed, with a median carina and next to this on each side consisting of a few rows of very elongate punctures; tergum II in dorsal view wider than long and slightly longer than tergum I; sternum II flattened near base, then gradually and slightly convex to apical margin; male terga II and III with well-developed and raised apical lamellae, tergum IV without apical lamella and slightly raised apically.

Material examined. HOLOTYPE, ♀, pinned (deposited in IEBR), “ VIETNAM, Cuc Phuong NP, Nho Quan , Ninh Binh, 20°21’06”N 105°35’23”E, ca 482 m, 7.viii.2019, Nguyen TP Lien & Nguyen Q Cuong” . PARATYPES (deposited in IEBR): 1 ♀, same data as holotype ; 1 ♂, Cai Kinh, Huu Lung , Lang Son, 22°39’42.9”N 106°15’36”E, 28 m, 24.xi.2015, Nguyen TP Lien, Nguyen D Dai & Tran T Ngat ; 1 ♀, Cuc Phuong NP, Nho Quan , Ninh Binh, 2.v.2008, Hoang V Tru ”.

Description. Female (Fig. 7). Body length 16–20.5 mm (holotype 16mm); fore wing length 15.5–19.0 mm (holotype 15.5 mm). Head in frontal view 1.1 × as wide as high (Fig. 1). Vertex well developed, strongly produced behind eye, with cephalic fovea, distance between foveae equal to front ocellus diameter (Fig. 2). Distance from posterior ocelli to apical margin of vertex about 2.4 × distance from posterior ocelli to inner eye margin (Fig. 2). Occipital carina complete, evanescent dorsally. Inner eye margins in frontal view 1.1 × further apart from each other at vertex than at clypeus (Fig. 1). Clypeus in frontal view higher than wide, about 1.1 × as high as wide, apical margin truncated (Fig. 1), width of emargination 1/3 × width of clypeus between inner eye margins; in lateral view disc of clypeus gradually and weekly convex from base to basal half, then going straightly to apical margin. Mandible with four prominent teeth. Antennal scape about 4.7 × as long as its maximum width; flagellomere I about 2.2 × as long as its maximum width, flagellomeres II–V longer than wide, flagellomeres VI–IX wider than long, terminal flagellomere bullet-shape, about 1.2 × as long as its basal width.

Mesosoma longer than wide in dorsal view. Pronotal carina raised, angulated at lateral corner before getting to dorsal part, reaching ventral corner of pronotum. Mesoscutum slightly convex, shorter than wide, 0.9 × as long as wide between tegulae (Fig. 3). Disc of scutellum and metanotum slightly convex. Propodeum deeply excavated medially at apex (Fig. 4), with the excavation about one-third of propodeal width, with a deep medial furrow running from basal triangular area to near apical margin, then with a short median carina running to apical margin; apical teeth of propodeum as seen from above forming a sharp angle (Fig. 4); posterior surface shiny; posterior and lateral surfaces bordered by blunt edge. Fore wing with prestigma equal to pterostigma.

Metasomal tergum I gradually widening from base to apex, with node at lateral two-fifth from base (Fig. 5), in dorsal view 1.39 × as long as wide, with longitudinal striation on dorsal part weakly developed, with a median carina and next to this on each side consisting of a few rows of very elongate punctures (Fig. 5). Tergum II in dorsal view wider than long, 1.13 × as wide as long (Fig. 6), and slightly longer than tergum I. Terga II and III with welldeveloped and raised apical lamellae (Fig. 6) (the raised lamella at apical margin of tergum III somewhat narrower than in tergum II), tergum IV with slightly raised and without lamella apically, terga V–VI normal, not raised and without lamella.

Body covered with silver setae. Clypeus covered with strong and sparse punctures, punctures at margins denser. Frons densely covered with coarse punctures. Vertex and gena with punctures shallower and sparser than those on frons. Pronotum with punctures coarser than those on frons. Mesocutum densely covered with coarse punctures. Punctures on scutellum and metanotum smaller, sparser and shallower than those on mesoscutum, and many small punctures added to the sides. Mesepisternum with very coarse punctures, with border between punctures raised to form reticulation; with distinctly epicnemial carina which separated smoothly anteroventral part and posterodorsal part with some coarse punctures. Metapleuron with a deep fovea in dorsal area, with some short striations and strong punctures in ventral area. Propodeum with punctures on posterior surface deep and well separated, punctures near medial furrow larger than those on other parts; lateral surface of propodeum with punctures arranged in few rows. Metasomal tergum I covered with large and deep punctures, area between punctures with minute punctures; punctures on tergum II smaller and shallower than those on tergum I except punctures near base undefined, denser and larger, area between the punctures with minute punctures; terga III–IV with smaller punctures than those on tergum II, terga V–VI with small punctures.

Color. Black, without metallic blue iridescence; following parts yellow: a large triangular spot in the middle of clypeus, two small spots on frons between antennal sockets, antennal scape beneath, small spot at base of mandible, two narrow and very short bands along pronotal carina in dorsal part of pronotum, large spot at apical margin of propodeum. Legs black. Wings dark brown, infuscate, with purple reflections, veins dark brown.

Male. Body length 11 mm; fore wing length 10.6 mm. Structure as in female, but differing from latter as follows: head proportionally smaller, almost round, in frontal view as wide as high ( Fig. 8 ). Vertex well developed, without cephalic fovea. Distance from posterior ocelli to apical margin of vertex about 2.6 × distance from posterior ocelli to inner eye margin ( Fig. 10 ). Occipital carina complete, present along entire length of gena, but dorsally weaker. Inner eye margins in frontal view strongly convergent, about 1.5 × further apart from each other at vertex than at clypeus ( Fig. 8 ). Clypeus in frontal view higher than wide, about 1.5 × as high as wide, apical margin deeply emarginated medially, forming blunt triangle tooth each lateral side ( Fig. 8 ), width of emargination 1/2 × width of clypeus between inner eye margins; in lateral view disc of clypeus gradually and weekly convex from base to basal half, then going straightly to apical margin. Antennal scape about 5 × as long as its maximum width; flagellomere I about 1.7 × as long as its maximum width, flagellomeres II–IX longer than wide, flagellomere X small, as long as wide, terminal flagellomere slightly curved, slightly more than 2.5 × as long as its basal width ( Fig. 9 ). Tergum III with well-developed apical lamella as in tergum II; tergum VII with short lamella and not raised.

Color. Similar to female but differing as follow: clypeus except margins yellow; legs black except spots on apical margin of middle tibia yellow, dorsal surfaces of fore, middle femora and inner surface of hind femur brown; tarsi dark brown.

Distribution. Vietnam (northern).

Etymology. The specific name refers to the type locality, Cuc Phuong NP, Ninh Binh province in the northern part of Vietnam; it is to be treated as a noun in apposition.

Remark. This species is similar to P. indosinensis Giordani Soika, 1960 in having terga II and II with well-developed, smooth and shiny apical lamellae in female, but differing as follow: body with stronger punctures, apical teeth of propodeum as seen from above forming a sharper angle (apical teeth of propodeum as seen from above forming a blunt angle in P. indosinensis ), and male tergum IV without apical lamella (male tergum IV with raised apical lamella in P. indosinensis ).

Figures

FIGURES 8–13. 8–10. Pseudozumia cucphuongensis sp. nov., male, 8. Head, frontal view; 9. Left antenna; 10. Vertex, dorsal view. 11–13. Pseudozumia indica borneana, female, 11. Head, frontal view; 12. Tergum I, dorsal view; 13. Habitus. Scale bar: 1 mm.