Discoelius nigerrimus Nguyen

Nguyen, Lien Thi Phuong, 2016, A new record of the genus Discoelius Latreille, 1809 (Hymenoptera: Vespidae: Eumeninae) from Northern Vietnam with description of two new species, Zootaxa 4154 (5), pp. 589-594: 593

publication ID

http://doi.org/10.11646/zootaxa.4154.5.8

publication LSID

lsid:zoobank.org:pub:FAE2E0AB-FCEB-48FD-8A4C-13A87250613D

DOI

http://doi.org/10.5281/zenodo.3507214

persistent identifier

http://treatment.plazi.org/id/03B687FF-5C06-F860-6C8C-FF69943ABF4C

treatment provided by

Plazi

scientific name

Discoelius nigerrimus Nguyen
status

sp. nov.

Discoelius nigerrimus Nguyen  , sp. nov.

( Figs 6–8View FIGURES 6 – 8)

Diagnosis. Clypeus emarginated at basal margin, with median carina from half of clypeus to supraclypeal area, apical margin nearly truncated; first metasomal segment petiolate, short and thick, T1 with swollen part in dorsal view nearly 1.6 × as long as wide, abruptly widening at one-fourth of the tergum from base, then slightly narrowly to apical margin; T2–T3 with well developed apical lamella, and T4 with apical lamella at only lateral corners.

Material examined. HOLOTYPE, ♀, “ VIETNAM, Ta Chai, Bac Ha, Lao Cai, 26.vi.2008, LTP Nguyen [ IEBR]. 

Description. Female. Holotype. Body length 13 mm; fore wing length 12.3 mm. Structure as in Discoelius aurantiacus  sp. nov., but differs as follows. Inner eye margins in frontal view as far apart from each other at vertex as at clypeus. Clypeus in frontal view slightly greater than 1.3 × as wide as long ( Fig. 6View FIGURES 6 – 8), emarginated at basal margin, with median carina from half of clypeus to supraclypeal area. T 2 in dorsal view longer than wide, 1.2 × as long as wide ( Fig. 7View FIGURES 6 – 8). T2–T3 with developed apical lamella ( Fig. 8View FIGURES 6 – 8), and T4 with apical lamella at only lateral corners.

Color. Black, with two faint orange marks near anterior margin of pronotum. Propodeal valvulae dark brown. Wings dark brown, strongly infuscate, veins dark brown.

Male. Unknown.

Distribution. Northern Vietnam: Lao Cai.

Etymology. The specific name refers to the black in the body.

Remarks. This species is similar to Discoelius aurantiacus  sp. nov., but can be easily distinguished from the latter by having clypeus emarginated at basal margin (nearly straight in D. aurantiacus  ), T 2 in dorsal view proportionally longer, about 1.2 × as long as wide (1.1 × as long as wide in D. aurantiacus  ), and T4 with apical lamella at lateral corners (T4 without apical lamella in D. aurantiacus  ). This species can be distinguished from other species of the genus by the combination of the following characters: T1 with swollen part in dorsal view nearly 1.6 × as long as wide, T2 & 3 with developed apical lamella, T4 with apical lamella at lateral corners, and color pattern.