Cryptoperla ishigakiensis (Kawai)

Stark, Bill P. & Sivec, Ignac, 2007, New Species And Records Of Asian Peltoperlidae (Insecta: Plecoptera), Illiesia 3 (12), pp. 104-126 : 110

Cryptoperla ishigakiensis (Kawai)

( Figs. 11-12 , 25 )

Neopeltoperla ishigakiensis Kawai, 1968b:231 . Holotype ♂, Karayama, Ishigaki Island, Japan (Bernise Bishop Museum)

Cryptoperla ishigakiensis: Uchida & Isobe, 1988

Material examined. Japan, Ryukyu Islands , Ishigaki Island, Omoto-sawa, August 1974, K. Tanida, 1 ♂, 1 ♀ ( BPS) .

Remarks. This material, provided by S. Uchida, represents the second known collection of this species. Kawai (1968b) described the species from a single male; we now add descriptions for the female and egg.

Female. Forewing length 9 mm. General color yellow brown without distinctive pattern. Subgenital plate parabolic, covering most of sternum 9 ( Fig. 25 ). Lateral bars obscure on sternum 9.

Egg. Chorion covered with elaborate scales but with broadly rounded sessile collar ( Fig. 11 ). Scales (mostly broken in Figs. 11-12 ) only slightly wider at apex than at base; apical scales near anterior pole with a single prominent keel extending from base to near apex; some scales located near collar with two prominent keels. Micropyles located on scales adjacent to collar. Chorion between scales covered with fine processes.

Diagnosis. The female and egg of this species are similar to C. formosana from the nearby island of Taiwan ( Stark & Sivec 2007), and to the Japanese species, C. japonica ( Uchida & Isobe 1988) , but the subgenital plate is longer than in either of these species, and is less rounded than C. formosana and less triangular in outline than C. japonica . The egg differs slightly from both in having one or two prominent keels on the chorionic scales which approach the scale apex; in C. japonica the scale keels are poorly developed ( Uchida & Isobe 1988) and in C. formosana they are well developed only at the scale bases ( Stark & Sivec 2007).

Figures

Figs. 7-12. Cryptoperla micrographs of eggs. 7. C. curvata entire egg, 8-10. C. fraterna, 11-12. C. ishigakiensis.

Figs. 25-28. Cryptoperla structures. 25. C. ishigakiensis female terminalia, 26-28. Cryptoperla kosai. 26. Head and pronotum, 27. Male terminalia, dorsal, 28. Aedeagus, ventral.