Diura majuscula (Klapalek, 1912)

Judson, Sarah W. & Nelson, C. Riley, 2012, 3541, Zootaxa 3541, pp. 1-118 : 42

Diura majuscula (Klapalek, 1912)

SYNONYMY

Dictyopterygella majuscule Klapálek, 1912

Diura nanseni (males) Brinck, 1949

Diura bicaudata (females) Brinck, 1949

Diura majuscula Zhiltzova, 1975

TYPE LOCALITY: Russia: Lena River, Bazaikha (Krasnoyarsk) and Ust-Kutsk .

DIAGNOSIS: Males are brachypterous, with the wing tips reaching the middle of the abdomen ( Fig. 268), but rarely to the apex, Comparatively, the wing tips of D. bicaudat a only extend slightly beyond the thorax to approximately tergum 2. Adult head of both sexes has a round pale interocellar mark that is closed posteriorly ( Fig. 268), in contrast to D. bicaudata which has a pointed mark that is open posteriorly ( Fig. 263). The pronotum has pale median stripe which is thicker than that of D. bicaudata . The male subanal lobes are pilous ( Fig. 269), with long, dense setation, whereas D. bicaudata has entirely glabrous subanal lobes ( Fig. 264). The female subgenital plate is broadly rounded at the apex ( Fig. 270), as opposed to D. bicaudata which is truncate ( Fig. 266). The nymph is unknown.

DISTRIBUTION—Global: East Palearctic— Regional: AOB, IDB— Aimag: AR, BO, KhD, KhG, SE*, TO^, UB*, ZA^.

DISCUSSION: Historically, D. majuscula males and females have been assigned to separate species (Brinck 1949). Currently, it is currently unclear if D. majuscula and the very similar D. nanseni are the same species. All specimens from Mongolia have been traditionally identified as D. majuscula , but this may be for historical (Zhiltzova 1972) and not taxonomic or morphological reasons. Diura nanseni may occur sympatrically or be the same species.