Alloperla rostellata (Klapalek, 1923)

Judson, Sarah W. & Nelson, C. Riley, 2012, 3541, Zootaxa 3541, pp. 1-118 : 25-26

Alloperla rostellata (Klapalek, 1923)

SYNONYMY

Isopteryx rostellata Klapálek, 1923

Chloroperla rostellata Illies, 1966

Alloperla rostellata Zwick, Levanidova, & Zhiltzova, 1971

TYPE LOCALITY: USSR: Irutsk.

DIAGNOSIS: The pronotum of this species is covered with darker reticulations ( Fig. 104) that are sometimes faded. In some specimens, similar dark reticulations are also evident on the head, particularly in the anterior and occipital regions. The abdomen has a dark medial stripe ( Fig. 104) which is somewhat wider than in other Alloperla . The base of the male epiproct is swollen and then constricted before greatly expanding ( Fig. 105). Although the epiproct is superficially similar to that of A. mediata in terms of its overall shape and the presence of lateral and ventral spines, the anterior portion of the epiproct in A. rostellata is more broadly rounded and almost triangular in its outline ( Fig. 105). From the lateral view, the epiproct is depressed dorsally and therefore thinner neat the tip, whereas in A. mediata is uniform in width. The female subgenital plate ( Fig. 106) is parallel sided and rectangular at the base, then abrubtly narrows at a 90 degree angle and forms a triangle that extends about 1/3 the length sternum 9. The overall shape of the plate is similar to A. mediata , ( Fig. 102), but that of A. mediata extends much further over sternum 9. The nymphs of this species, like all other Mongolian Alloperla , are unknown at the species level due to lack of comparative material.

DISTRIBUTION—Global: East Palearctic— Regional: AOB^— Aimag: AR^, BU^, KhG^, ZA^.

DISCUSSION: This species is a new record for Mongolia. Modeling predicts additional occurrences of this species in other moderate to high elevation regions. Like other Mongolian Alloperla , it is found primarily in the area near Lake Hovsgol and throughout the Selenge River Basin ( Fig. 107) .