Neoperla darlingi, Stark & Sivec, 2007

Stark, Bill P. & Sivec, Ignac, 2007, Studies Of Indonesian Perlidae (Plecoptera), With Descriptions Of Three New Species, Illiesia 3 (7), pp. 53-64 : 55-56

Neoperla darlingi sp. n.

( Figs. 3‐6 )

Material examined. Holotype ♂ from Indonesia, West Kalimantan, Gunung Palung National Park, Cabang Panti Research Station , 1° 15’ S, 100° 05’ E, 100‐400 m, June 15‐August 15 1991, Malaise trap, IIS 910113, D.C. Darling, Rosichon, Sutrisno ( MZB).

Adult habitus. General color yellow brown without distinctive markings. Head uniformly pale brown, antennal bases pale but slightly darker distally. Pronotum pale brown, legs yellow brown. Wing membrane transparent, veins brown.

Male. Forewing length 9 mm. Process of tergum 7 broadly rounded and armed on apex with sensilla basiconica. Median sclerite of tergum 8 flat but with conspicuous patch of sensilla basiconica scattered over sclerite and more sparsely on membranous field. Tergum 9 with a pair of low humps covered with sparse patches of sensilla basiconica. Hemiterga typical, anterior finger lobes bent outward near mid length ( Fig. 3 ). Aedeagal tube plump and poorly sclerotized; sac bearing two pairs of lateral, membranous, spiny lobes; small pair located lateral to apex of dorsal sclerite and larger pair located just beyond ( Figs. 4‐6 ). Armature consists of variably sized spines with largest located near apex of sac as a patch on dorsum and a short median row on venter; minute spines cover much of area beyond lobes; armature on lobes more prominent on larger lobe particularly on ventral surfaces; area between lobes connected by irregular rows of moderate sized spines on dorsum and on venter by a low hump covered with minute spinules.

Female. Unknown.

Larva Unknown.

Etymology. The patronym honors D.C. Darling, collector of the holotype and other specimens used in our studies.

Diagnosis. This species is a member of the oculata complex of the montivaga group as defined by Zwick (1986a) but the aedeagus is more similar to N. flavicincta Zwick , from Sumatra and N. flinti Sivec from the Philippines than to other members of the complex known from Borneo ( Sivec 1984; Zwick 1986a; Zwick & Sivec 1985). From the former species it differs in having two pairs of lateral spiny lobes and in details of the apical spine patch; from the latter species it differs in lacking a mid ventrobasal spiny lobe on the aedeagal sac and in having the lateral lobes located adjacent to one another.

Figures

Figs. 3‐6. Neoperla darlingi male genitalia. 3. Male abdominal segments 7‐10, 4. Aedeagus dorsal, 5. Aedeagus lateral, 6. Aedeagus ventral.