Nemoura nigrodentata Zhiltzova, 1980

Judson, Sarah W. & Nelson, C. Riley, 2012, 3541, Zootaxa 3541, pp. 1-118 : 34

Nemoura nigrodentata Zhiltzova, 1980

SYNONYMY

Nemoura nigrodentata Zhiltzova, 1980

TYPE LOCALITY: Mongolia: Khentii Aimag, Onon River .

DIAGNOSIS: The apical prongs of the epiproct ventral sclerite are rounded and gradual taper. At the apicies of the prongs, there are densely-packed, short spines ( Fig. 181), the distribution of the spines is similar to that of N. sahlbergi ( Fig. 187). Zhiltzova (1980) notes that the main differences between the epiprocts of N. nigrodentata and N. sahlbergi are that the epiproct of N. nigrodentata has “a slightly different form of apical scerites and a larger diameter that they circumscribe [and] the dorsal sclerties are narrower and tighter” (translated from Russian). Like N. sahlbergi ( Fig. 188) and N. sp. A. ( Fig. 193), the outer (major) lobe of the paraproct is concave, although in N. nigrodentata it is more truncate ( Fig. 182). The main difference between N. sahlbergi and N. nigrodentata is the shape of the lateral process extending from the cerci ( Fig. 183). In N. nigrodentata , the additional spine that joins the cercus approximately 0.5 mm below the apex, is hook shaped and points posteriorly ( Fig. 183), in contrast to N. sahlbergi in which the spine is triangular and points anteriorly. As with all other Mongolian Nemouridae , the female plate is broadly rounded and not particularly diagnostic due to variation within and between species. The nymph is unknown.

DISTRIBUTION—Global: Russian Far East— Regional: POB*— Aimag: KhE*.

DISCUSSION: Nemoura Nigrodenta was not documented during our study, but we anticipate potential collections in future expeditions to the eastern Khentii region near the type locality. This species is believed to be endemic to Mongolia, as there are no known records from surrounding areas. Replications of the original illustrations (Zhiltzova 1980) are provided ( Fig. 181–183). The authors have an English translation of the original Russian description, available upon request .