Neoperla yao Stark, 1987

Stark, Bill P. & Sivec, Ignac, 2008, New Species And Records Of Neoperla (Plecoptera: Perlidae) From Vietnam, Illiesia 4 (3), pp. 19-54 : 41-42

Neoperla yao Stark

( Figs. 72‐74 , 121‐123 )

Neoperla yao Stark, 1987:47 . Holotype ♂ (B.P. Bishop Museum). 6 km S Dalat , Vietnam

Material examined. Vietnam: Cao Bang, Ba Be National Park , between park gates and pond, UV light, 22 May 1995, D. Currie, J. Swann, M. McGuffin, ROM 956119, 1 ♂ ( ROM) . Gia Lai, An Khe District, Tram Lap, Azun River , 3 km NE on trail from forestry building, 21 June 1996, D. Currie, J. Swann, ROM 961076, 1 ♂ ( ROM) . Gia Lai, An Khe District, Tram Lap , near pond and coffee plantation, 14 June 1996, UV light, 14 ° 26’ N, 108 ° 33’ E, B. Hubley, D. Currie, J. Swann, ROM 961045, 1 ♂, 2 ♀ ( ROM) . Gia Lai, Buoenloy , April 1995, A. Gorohov, 1 ♂ ( PMSL) .

Remarks. This species was previously known from three males. Two of these are from sites in southern Vietnam and the other in China. These additional males, from the southern region of Vietnam are in close agreement with the description in Stark (1987).

Adult habitus. Biocellate. Head mostly yellow but with a dark spot over ocelli and a second small spot anteromesally on frons; spot over ocelli usually acute on anterior margin ( Fig. 72 ). Pronotum pale brown, disc becoming paler near lateral margins; rugosities obscure. Wing membrane pale, veins pale amber, costal area pale. Femora yellow brown, tibiae slightly darker.

Putative Female. Forewing length 12 mm. Subgenital plate a narrow tab, slightly expanded at apex and broadly U‐ shaped on posterior margin ( Fig. 74 ). Vagina longer than wide and slightly constricted near midlength ( Fig. 73 ). Spermathecal stalk short, spermatheca slender, twisted at midlength and slightly hooked at apex.

Egg. Pear shaped. Length ca. 0.31 mm, width ca. 0.23 mm. Collar short with heavy meshwork of irregular shaped and pitted cells on sides; rim slightly flanged, margin irregularly scalloped; collar ca. 0.08 mm wide ( Figs. 121‐123 ). Chorion appearing smooth but with small, shallow pits and obscure FCIs covering surface.

Diagnosis. See above under N. mnong .

Figures

Figs. 72‐74. Neoperla yao. 72. Head and pronotum, 73. Vagina and spermatheca, 74. Female terminalia.

Figs. 118‐123. Egg micrographs. 118‐120. N. teresa. 118. Egg, 119. Collar, 120. Lid. 121‐123. N. yao. 121. Egg, 122. Collar, 123. Lid.