Perlodes kippenhani, Stark, 2010

Stark, Bill P., 2010, Studies On Korean Stoneflies (Insecta: Plecoptera) With Descriptions Of Two New Species, Illiesia 6 (1), pp. 1-10 : 7

Perlodes kippenhani sp. n.

( Figs. 19-22 )

Material examined. Holotype ♂, Republic of Korea, Gangwondo, Pyeongchang-gun, Odaesan National Park trail to Sangwonsa , 13 May 2006, M. Kippenhan ( USNM).

Adult habitus. General color black with limited areas of yellow pigment. Head dark but with circular interocellar yellow spot and pale M-line forward of median ocellus ( Fig. 19 ); additional pale areas on occiput. Pronotum black with yellow median stripe, thoracic venter mostly black. Femora black, tibiae dark at base but slightly paler for most of length. Wing membrane transparent to pale brown, veins dark brown. Wings with several crossveins between R vein and Costa beyond cord. Gills apparently absent or, if present, collapsed under submentum. Basal two abdominal segments divided by pleural membrane.

Male. Forewing length 13 mm. Abdominal terga without lobes, but terga 9-10 dark with areas of pale pigment ( Fig. 20 ); tergum 10 with pale posteromedian area armed with a small patch of short, anteriorly directed, thickened setae; tergum 8 and 9 with wide patches of sensilla basiconica near posterior margins. Paraprocts with slender, dark sclerite along caudolateral margins and much of anterior area occupied by an expansive, eversible membranonous lobe, which extends forward from apex toward posterior margin of tergum 10 ( Figs. 20- 22 ). Abdominal sternum 7 with a small median lobe projecting dorsad into intersegmental membrane ( Fig. 22 ).

Female. Unknown.

Larva. Unknown.

Etymology. The patronym honors Michael Kippenhan, collector of the holotype specimen.

Diagnosis. Perlodes is poorly known in Asia, and only one species, P. stigmata Ra, Kim, Kang & Ham , has been reported from Korea (Ra et al. 1994). The new species differs from P. stigmata in several respects including having the pronotal disks almost entirely black, in lacking submental gills, in having two rather than three basal abdominal segments divided by pleural membrane, and in details of the male paraprocts. Ra et al. (1994) show the paraprocts of P. stigmata as triangular structures projecting posteriorly and crossing near midlength. In P. kippenhani these structures extend upward and terminate on the anteroapical margin with a large membranous bag, or eversible paraproct lobe (EPL of Zwick 1997) similar to those found in at least some other members of Perlodes and Filchneria ( Zwick 1997) . No lobe is present on sternum 7 in Perlodes microcephalus (Pictet) or P. disbar (Rambur) (Zwick pers. comm.) and in P. kippenhani this structure projects dorsad and could be easily overlooked. The new species is also similar to one being described by V.A. Teslenko from the Russian Far East (Teslenko pers. comm.) but in her species the posterior margin of tergum 10 extends upward more strongly than in the Korean species and the sclerotized portion of the paraprocts in the Russian species appears to be more extensive than in P. kippenhani .

Figures

Figs. 19-22. Perlodes kippenhani structures. 19. Head and pronotum. 20. Male terminalia, dorsal. 21. Male terminalia, ventral. 22. Paraproct, lateral.