Cryptoperla kosai, Stark & Sivec, 2007

Stark, Bill P. & Sivec, Ignac, 2007, New Species And Records Of Asian Peltoperlidae (Insecta: Plecoptera), Illiesia 3 (12), pp. 104-126 : 111-112

Cryptoperla kosai sp. nov.

( Figs. 26-28 )

Material examined. Holotype ♂ from Thailand, Upper Panjane and Wieng Ko Sai National Park, 25- 26 October 2002, I. Sivec ( PMSL). Paratypes: Thailand: Chiang Mai Province, Doi Inthanon National Park, Bang Khun Klang , 1200 m, 98 ° 32’ N, 18 ° 32’ E, 29 August-5 September 1989, H. Malicky, P. Chantaramongkol, 2 ♂ ( PMSL) .

Adult habitus. Biocellate. General color yellow brown. Head with brown patch covering ocelli and extending forward over most of anterior frons ( Fig. 26 ). Pronotum yellow brown with scattered darker and lighter rugosities on disc.

Male. Forewing length 8.5 mm. Tergum 10 triangular at apex. Basal cercal segment ca. 5X long as basal width, sparsely fringed along inner margin with fine long setae and slightly swollen around midlength; spur absent ( Fig. 27 ). Ventroapical aedeagal margin 4-lobed; inner lobes smaller and covered with fine, brownish microtrichia. Mesobasal field bearing a pair of small membranous knobs and a sparse area of pale brown setae ( Fig. 28 ).

Female. Unknown.

Larva. Unknown.

Etymology. The species name, used as a noun in apposition, is based on the type locality in Wieng Ko Sai National Park.

Diagnosis. This species is similar, externally to C. simplex (described below) but the two are distinct in aedeagal armature pattern. This species has the setae separated into a pair of sparse patches populated by mostly short, pale setae, whereas in C. simplex the setae are grouped into a single patch of dark brown, long setae. The two paratypes listed above have longer setae than the holotype and may represent a closely related sister species.

Figures

Figs. 25-28. Cryptoperla structures. 25. C. ishigakiensis female terminalia, 26-28. Cryptoperla kosai. 26. Head and pronotum, 27. Male terminalia, dorsal, 28. Aedeagus, ventral.