Arcynopteryx

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

Arcynopteryx

DIAGNOSIS: The male hemitergal processes are short and medially directed ( Fig. 253). The processes are longer than those of Skwala but much shorter than those of Megarcys . The male epiproct is long and needle-like ( Fig. 248, 258), especially useful for distinguishing from Skwala , which lacks an external epiproct ( Fig. 292). The female subgential plate has a broad depression ( Fig. 249), slightly deeper than that of Skwala , with the prominent posteriorly directed lobes. Nymphs have only submental gills and the mesosternal ridge arms terminate at the anterior corners of the furcal pits. Arcynopteryx nymphs may be separable from Skwala on the basis of a pleural fold which divides abdominal segments 1 through 3 and unserrated mandibles, however we did not have sufficient Mongolian specimens, particularly of the unknown A. sajanensis and S. asiatica , to confirm these diagnostic characteristics.

DISTRIBUTION—Global: Holarctic- Regional: AOB, IDB— Aimag: AR^, BO^, BU^, KhG, KhD^, OV^, SE*, TO, UB^, UV*, ZA.

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. 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 in Mongolia are most often found in low to medium gradient rivers at higher elevations (greater than 1500 m). The range of A. sajanensis ( Fig.303) is depicted as a severely restricted range in the north due to lack of georeferenced localities from historical records in western Mongolia.