Peltoperlopsis swanni, Stark & Sivec, 2007

Stark, Bill P. & Sivec, Ignac, 2007, New Species And Records Of Asian Peltoperlidae (Insecta: Plecoptera), Illiesia 3 (12), pp. 104-126 : 123-124

Peltoperlopsis swanni sp. nov.

( Figs. 67-70 )

Material examined. Holotype ♂ from Vietnam, Lao Cai, Sapa, large waterfall on road from Sapa to Lai Chau, UV light, 8 May 1995, D. Currie, B. Hubley, J. Swann, ROM 956022 ( ROM).

Adult habitus. Biocellate. Head brown to yellow brown with pale M-line interrupted by narrow median brown band; area around ocelli pale brown ( Fig. 67 ). Pronotum brown with scattered pale rugosities. Wing membrane pale brown, veins brown. Femora yellow brown, tibiae obscurely banded with broad pale mesal band between small, slightly darker apical bands.

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Male. Forewing length 11 mm. Tergum 10 with Ushaped brown mark ( Fig. 68 ). Basal cercal segment ca. 1.3X long as basal width; segments clothed laterally with short fringe setae. Vesicle about 2X wide as long ( Fig. 69 ). Apical section of aedeagus deeply bilobed; lobes armed dorsally with tiny spike shaped microtrichia, a marginal patch of long thick setae, and an inner patch of fine brown hair-like spines ( Fig. 70 ); the latter type of spines also occur ventrally in a large marginal patch. Ventral lobes with additional small lobe on each side armed with microtrichia and a patch of triangular spines.

Female. Unknown.

Larva. Unknown.

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Etymology. The patronym honors J. Swann, one of the collectors of the holotype.

Diagnosis. This species shares the U-shaped tergum 10 feature with P. malickyi but differs from that species in having a smaller and better defined vesicle, shorter cercal fringe setae, and in details of aedeagal armature. Conspicuous among the aedeagal features is the absence of a pair of thin dorsal sclerites as shown by Stark & Sivec (1999) for P. malickyi . The species is also generally similar to P. spinosa but that species has clusters of long bristles on several median cercal segments and long fringe setae on basal cercal segments.

Figures

Figs. 67-70. Peltoperlopsis swanni structures. 67. Head and pronotum, 68. Male terminalia, dorsal, 69. Male sternum 9, 70. Aedeagus, dorsal.