Agnetina extrema (Navas, 1912)

Judson, Sarah W. & Nelson, C. Riley, 2012, 3541, Zootaxa 3541, pp. 1-118 : 37-38

Agnetina extrema (Navas, 1912)

SYNONOMY

Togoperla extrema Navas, 1912

Kamimuria sibirica Klapalek, 1916

Phasganophora extrema Klapalek, 1923

Kamimuria costalis Navas, 1923

Perla navasa Claassen, 1936

Neophasganophora extrema Claassen, 1940

Phasganophora extrema Illies, 1966

Phasgnophora brevipennis Rauser, 1968

Agnetina extrema Zhiltzova, 1979

TYPE LOCALITY: Russia: Eugenievka , Primorskiy kray .

DIAGNOSIS: The head of the adult of this species is distinctly patterned with a central dark mark that borders the posterior margin of the paler M-line and extends to the lateral ocelli ( Fig. 212). The pronotum is dark brown except for a prominent yellow median line ( Fig. 212). The described coloration is more highly contrasting than other Agnetina from Mongolia ( Fig. 202, 207). The male hemitergal process ( Fig. 213) somewhat resembles A. cocandica ( Fig. 208), but the carina at the basal curve does not extend the entire width of the hemiterga as it does in A. cocandica . From the lateral aspect, the hemiterga are only slightly sinuate. The female subgenital plate is broadly rounded and sometimes notched ( Fig. 214). Nymphs ( Fig. 215) most closely resemble A. brevipennis ( Fig. 205), both species having an unpigmented region on the clypeus and dark pigmentation on the labrum as opposed to A. cocandica which has an isolated M mark on the clypeus and a pale labrum with dark pigmentation only along the anterior margin ( Fig. 210). In A. extrema the light area is T-shaped ( Fig. 215) since it is invaded by two dark arms on the same plane as the antennal insertion. Also like A. brevipennis , the major proventricular bands of the dissected esophagus are of uniform width, unlike those of A. cocandica which are very narrow in the middle.

DISTRIBUTION—Global: East Palearctic— Regional: AOB, IDB*, POB*— Aimag: AR^, DA^, DO*, GA*, KhD^, KhE*, KhG^, OV, TO.

DISCUSSION: Agnetina extrema appears to have a distribution restricted to the Selenge River Basin ( Fig. 265), whereas other Agnetina species extend into the Altai and are predicted to occur in the east. We documented A. extrema in less mountainous areas of moderate elevation (800 to 1800 msl).