Phanoperla vietnamensis Zwick. The 2010

Phanoperla vietnamensis Zwick

(Figs. 33-36)

Phanoperla vietnamensis Zwick, 1986:151.

Holotype ♂ (B.P. Bishop Museum). Kim Lien, Vietnam

Material examined. Vietnam: Dac Lac, Yok Don National Park, Park Headquarters, ca. 2 km SE Ban Don, 31 May 1997, D.C. Darling, D. Currie, A. Guidotti, ROM 974019, 2♂, 5♀ (ROM). Dong Nai, Cat Tien National Park, nr. Park Headquarters, 22 August 1998, B. Hubley, D. Currie, ROM 982002, 2♂, 1♀ (ROM, IEBR). Same site, 23 August 1998, B. Hubley, D. Currie, ROM 982006, 4♂ (ROM, BPS). Gia Lai, An Khe Dist., Tram Lap, Azun River, 21 June 1996, D. Currie, J. Swann, ROM 961076, 1♂ (ROM). Same site, 23 June 1996, D. Currie, J. Swann, ROM 961084, 1♂ (ROM). Same site, 17 June 1996, D. Currie, J. Swann, ROM 961056, 2♂ (IEBR). Nam Cat Tien, 200 m, 17-25 June 1995, H. Malicky, 1♂ (PMSL). Nghe An, W Con Cuong, Khe Moi Forestry Camp, 25-26 October 1994, D. Currie, ROM 946111, 1♂ (ROM).

Remarks. The new records are from sites in the central and southern regions of Vietnam, generally north of the Lam Dong site where a paratype was collected (Zwick 1986). The females are associated on the basis of occurrence together with males of P. vietnamensis at two sites and on the basis of slightly larger size for this species than for others found at Cat Tien National Park.

Female. Forewing length 10-11 mm. Body pale, without distinctive dark pigment except on margins and median suture of pronotum. Subgenital plate lobes directed inward and apically narrowed; notch U-shaped (Fig. 36). Plate generally similar to that of P. maindroni (Navas) and Phanoperla sp. D (Zwick 1982) but the notch appears to be somewhat narrower and more rounded anteriorly than for either of these species.

Egg. Length ca. 435 µm, equatorial width ca. 205 µm. Collar short and ca. 84 µm wide at rim; basal constriction ca. 74 µm wide diameter (Fig. 33). Chorion punctate over most of surface but smooth in a narrow equatorial ring (Fig. 35); chorionic pits absent in zone along ribs extending from collar (Fig. 34); pits deeper and more distinct on lid (Fig. 35). Micropyles appearing evenly spaced in specimens examined; orifices surrounded by smooth circular rims. The egg of P. vietnamensis is similar to that of P. wedda (Zwick 1982) but varies in lacking pits along the chorionic ribs associated with the collar.