Alloperla mediata (Navás, 1925)

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

Alloperla mediata (Navás, 1925)

SYNONYMY

Chloroperla mediata Navás, 1925

Alloperla alexanderi Nelson and Hanson, 1968

Alloperla mediata Zwick, Levanidova, & Zhiltzova, 1971

TYPE LOCALITY: Siberia: Vladivostok.

DIAGNOSIS: The pronotum of A. mediata has a characteristic dark medial stripe ( Fig. 100), in addition to the abdominal stripe typical in most Mongolian Chloroperlidae . The anteriorly directed epiproct is short and pointed, composed of two portions, nearly subequal in width, which are separated by a pronounced constriction. This is in contrast to A. rostellata , in which the anterior portion of the epiproct is much wider than the base ( Fig. 105). Numerous lateral and ventral spines on the epiproct are visible from the dorsal view, similar to A. rostellata but unlike in A. joosti where they are only visible laterally. From the lateral view, the epiproct is uniform in width, whereas in A. rostellata it is thinner near the tip. The female subgenital plate ( Fig. 102) is a long, narrow triangle with a rectangular, parallel-sided base, extending nearly the entire length of sternum 9. A. rostellata has a similar shaped plate ( Fig. 106), but it only extends slightly over sternum 8. The nymphs of Mongolian Alloperla are indistinguishable at the species level.

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

DISCUSSION: This species is a new record for Mongolia and specimens documented by our study were included in a preliminary checklist of Mongolian stoneflies (Surenkhorloo 2009). Predictive modeling suggests that this species will also be found in eastern mountains of Mongolia ( Fig. 103).