Kathroperla doma, Stark, 2010

Stark, Bill P., 2010, Studies On Korean Stoneflies (Insecta: Plecoptera) With Descriptions Of Two New Species, Illiesia 6 (1), pp. 1-10 : 1-4

Kathroperla doma sp. n.

( Figs. 1-10 )

Material examined. Holotype ♂, Republic of Korea, Chungbuk, Sangchon-Myeon, Dungeon-li near Doma Pass , 750 m, 2-26 May 2006, P. Tripotin coll. 2, Malaise trap in forest on small stream ( USNM) . Paratype: Republic of Korea, Gangwondo , Odaesan, near Dong-daesan, 800 m, 37° 44.31’ N, 128° 35.71’ E, 3-21 June 2006, P. Tripotin, coll. 4, Malaise trap in old Korean fir forest, 1♀ ( USNM) .

Adult habitus. General color brown with pale areas on body. Head with dark brown median patch covering ocelli and extending to anterior frons ( Fig. 1 ); occiput paler but with numerous irregularly-shaped, scattered maculations. Pronotum brown but with pale median and lateral margins.Thoracic sterna with extensive dark brown areas. Wings pale with dark veins, legs pale brown, cerci dark brown.

Male. Forewing length 15 mm. Cerci 4-segmented. Abdominal tergum 9 bearing a slightly darker, median brown patch covered with short, thick setae ( Fig. 2 ). Epiproct with a butterfly-like shape ( Figs. 2, 4-5 ); anterior sclerite very dark, lateral margins elevated and median field depressed in a deep V; posterodorsal margin of tergum 10 darker and with a short median, very dark stem connecting to median area of epiproct sclerite; epiproct surrounded on posterolateral margins by membranous lobes of paraprocts. Vesicle of sternum 9 almost circular in outline and bearing very fine setae on ventral surface; margins darker around dorsum ( Fig. 3 ). Aedeagus not everted.

Female. Forewing length 16 mm. Cerci 4-segmented. Subgenital plate reaches beyond mid point of sternum 9; posterior margin bifurcate with divergent lobes ( Fig. 6 ); internal dark bar extends from base of notch for most of plate length.

Egg. Based on eggs dissected from ovarioles. Four sided. Length ca. 350 µm; width at midlength ca. 216 µm and tapered to both ends ( Fig. 6 ); apical width ca. 50 µm. Poles blunt, similar, almost square and with four longitudinal ribs extending between corners of poles ( Figs. 7-8 ). Surfaces between ribs concave and covered with small irregularly sized blunt projections ( Fig. 9 ).

Larva. Unknown.

Etymology. The species name, used as a noun in apposition, is based on Doma Pass, where the holotype specimen was collected.

Diagnosis. Kathroperla doma while generally consistent with the Kathroperla ground plan, has a derived cercal structure, female subgenital plate structure and egg structure that separate it from both Nearctic species. Males are similar to K. takhoma in vesicle shape but lack the patches of sensilla basiconica found on tergum 10 in that species. The new species is also distinguished from the Nearctic species on the basis of the 4-segmented cerci ( Figs. 2- 3 ); both Nearctic species have 12-13 cercal segments. The female subgenital plate is more similar in length and basal outline to K. perdita but differs in having divergent apical lobes and in the presence of a mesal internal sclerite ( Fig. 10 ). Eggs of the Nearctic species are circular in cross section and have coarsely tuberculate chorionic surfaces whereas the egg of K. doma is more or less 4 sided and has a finely tuberculate chorion.

Comments. The genus Kathroperla , originally proposed from a single female specimen of K. perdita Banks collected in British Columbia ( Banks 1920), remained monotypic until Stark & Surdick (1987) described K. takhoma from California and Washington. The group was thought to be a Nearctic endemic, but like Utaperla Ricker , another paraperline genus reported earlier from the Russian Far East ( Zhiltzova 1982; Zhiltzova & Levanidova 1970; Zwick 2006), Kathroperla is now also known from the eastern Palearctic region.

Figures

Figs. 1-5. Kathroperla doma structures. 1. Head and pronotum. 2. Male terminalia, dorsal. 3. Male terminalia, ventral. 4. Epiproct, oblique dorsal aspect. 5. Epiproct, oblique lateral aspect.

Figs. 6-9. Kathroperla doma egg. 6. Entire egg, lateral aspect. 7. Collar end, lateral aspect. 8. Collar end, apical aspect. 9. Detail of chorionic surface.

Fig. 10. Kathroperla doma female terminalia, ventral.