Phanoperla doisuthep, Sivec & Stark, 2010

Sivec, Ignac & Stark, Bill P., 2010, Seven New Species Of Phanoperla Banks From Vietnam And Thailand (Plecoptera: Perlidae), Illiesia 6 (10), pp. 98-112 : 98-99

Phanoperla doisuthep sp. n.

( Figs. 1-3 )

Material examined. Holotype ♂ from Thailand, Chiang Mai Province, Doi Suthep-Pui National Park, Namtok Sai Yoi , 98° 55’ N, 18° 48’ E, 1000 m, 6-7 June 2002, Chiang Mai University Team ( PMSL) . Paratypes: Chiang Mai Province Doi Suthep-Pui National Park, Huai Kaew above Monthratarn , 98° 55’ N, 18° 49’ E, 800 m, 6-26 May 2002, Chiang Mai University Team 1♂ ( PMSL) . Phitsanulok Province, Phu Hin Rongkla National Park, Waterwheel Falls , 101° 00’ N, 16° 59’ E, 1280 m, 4-5 May 2003, I. Sivec ( PMSL) 1♂ .

Adult habitus. Biocellate. Ocelli large, close together and bordered by dark pigment on inner margins. Head yellow brown with slightly darker M-line and calluses; antennal bases yellow and flagellum brown. Pronotum pale with brown rugosities. Legs uniformly pale brown with small brown oval spot in upper third of tibiae; apical tarsal segment only slightly brownish. Cerci uniformly pale.

Male. Forewing length 10 mm. Tergum 8 with small mesal lobe. Tergum 9 with large lateral and median sensilla basiconica patches set on low mounds ( Fig. 1 ). Hemitergal processes wide at base, tapered to an acute apex and curved slightly laterad. Aedeagal tube poorly sclerotized but with a pair of small ventrobasal knobs and a low dorsoapical membranous lobe ( Fig. 2 ); aedeagal sac curved strongly ventrad and bearing a rounded membranous lobe near midlength; sac armature restricted to a dorsobasal patch of small to moderate spines that extend onto lateral surface, and a more prominent subapical and apical patch which includes a prominent field of large cultriform spines ( Fig. 3 ).

Female. Unknown.

Larva. Unknown.

Etymology. The species name, used as a noun in apposition, is based on the type locality.

Diagnosis. The aedeagus and male terminalia of P. doisuthep are similar to those of P. himalayana Zwick , a species known from Bhutan, India and Nepal ( Zwick 1982). It differs in having a poorly developed ventral sclerite and in lacking the ventroapical lobes on the aedeagal tube which occur distal to the sclerite in P. himalayana . In addition, P. doisuthep has a prominent ventral lobe on the sac that is absent in P. himalayana and the distribution of large apical spines on the sac also differ.

Figures

Figs. 1-3. Phanoperla doisuthep. 1. Male terminalia, dorsal. 2. Fully everted aedeagus, lateral. 3. Aedeagal sac apex.