Mesocapnia variabilis (Klapalek, 1920)

Judson, Sarah W. & Nelson, C. Riley, 2012, 3541, Zootaxa 3541, pp. 1-118 : 22-23

Mesocapnia variabilis (Klapalek, 1920)

SYNONYMY

Capnia variabilis Klapálek, 1920

Mesocapnia variabilis Zwick, 1973

TYPE LOCALITY: North Siberia: Yakutsk, Jakutien. DIAGNOSIS: Mesocapnia variabilis males and females are macropterous ( Fig. 76), and therefore are superficially similar to M. silvatica . The male epiproct has a pronounced swollen bulb towards the base ( Fig. 77), which is visible from both dorsal ( Fig. 77) and lateral ( Fig. 78) aspect. The epiproct of M. variabilis narrows noticeably following the swollen bulb and then widens again before gradually tapering to a point ( Fig. 77, 78). Other Mongolian Mesocapnia have epiprocts of relatively uniform width ( Fig. 68), with the exception of narrow apices. The female subgenital plate is broadly rounded ( Fig. 79) similar to M. silvatica from which it cannot be sepearated consistently. The nymphs are indeterminable to genus or species.

DISTRIBUTION—Global: Holarctic- Regional: AOB, IDB- Aimag: AR, BO, KhG, TO, UB*, UV*, ZA^.

DISCUSSION: Historical specimens of M. silvatica from previous MAIS expeditions that we validated were clearly M. variabilis . This continues to call the validity of M. silvatica into question.