Arcynopteryx compacta (McLachlan, 1872)

Judson, Sarah W. & Nelson, C. Riley, 2012, 3541, Zootaxa 3541, pp. 1-118 : 40

Arcynopteryx compacta (McLachlan, 1872)

SYNONYMY

Dictyopteryx compacta McLachlan, 1872

Arcynopterygoides vernalis Raušer, 1968

Arcynopteryx compacta Brinck, 1949

Skwala compacta Teslenko, 2012

TYPE LOCALITY: East Siberia .

DIAGNOSIS: Males often brachypterous ( Fig. 247). Male hemitergal processes wide and with a dorsally projecting lobe at the apex that gives the processes the appearance of being curved anteriorly ( Fig. 248). The female subgenital plate has a broad, shallow median notch and two rounded lobes ( Fig. 249). As compared to other Arcynopterx ( Fig. 254, 259), the sides of the plate are gradually sloped inward to form the two lobes. The nymph ( Fig. 250) is similar to A. polaris and Skwala pusilla ( Fig. 291), however A. compacta has more pronounced light markings particularly on the head and generally shorter submental gills than S. pusilla .

DISTRIBUTION—Global: Circumpolar— Regional: AOB, IDB— Aimag: AR^, BO^, BU^, KhD^, KhG, OV^, SE*, UB^.

DISCUSSION: While this manuscript was in press, this species was moved to Skwala (Teslenko 2012) based on reexamination of types and new material, including aedeagal extrustion and scanning electron microscopy of eggs and genitalia. Arcynopteryx compacta has one of the longer synonymic histories for stoneflies, with most species in the history documented in Europe and therefore having little bearing on our work in Mongolia. A full synonymy is available from DeWalt et al. (2010). The species Arcynopterygoides vernalis described by Raušer (1968) from Mongolian specimens was later recognized as a mix of Arcynopteryx compacta and Skwala pusilla , probably due in part to the similarity in the female subegential plate, both species having a variably shallow depression.