Cryptoperla simplex, Stark & Sivec, 2007

Stark, Bill P. & Sivec, Ignac, 2007, New Species And Records Of Asian Peltoperlidae (Insecta: Plecoptera), Illiesia 3 (12), pp. 104-126 : 114-115

Cryptoperla simplex sp. nov.

( Figs. 39-43 )

Material examined. Holotype ♂ and 3 ♂, 9 ♀ paratypes from Thailand, Phitsanulok Province, Phu Hin Rongkla National Park, Waterwheel Falls , 1280 m, 101° 00’ N, 16° 59’ E, 20-21 October 2002, I. Sivec ( PMSL). Additional paratypes: Thailand: Khao Yai,

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Khao Kheo , 16-17 October 2000, I. Sivec, 1 ♂, 1 ♀ ( PMSL) . Chiang Mai Province, Chiang Dao , Chiang Dao W. Res. Center, 520 m, 98 ° 55’ N, 19 ° 21’ E, 9-14 October 2002, I. Sivec, 2 ♀ ( PMSL) . Additional material: Thailand: Khao Yai, Khao Kheo , 16 September 2000, I. Sivec, 1 larva ( PMSL)

Adult habitus. Biocellate. General color pale brown with dusky markings on frons and darker rugosities on pronotal disc ( Fig. 39 ). Legs pale brown. Wings transparent, veins pale brown.

Male. Forewing length 9-9.5 mm. Tergum 10 outline triangular. Basal cercal segment ca. 5.5 X long as basal width; spur absent but inner margin with sparse fringe of long setae ( Fig. 40 ). Aedeagal apex with four lobes; venter of inner lobes bear a large median patch of brown setae ( Fig. 42 ); base of aedeagus with a brownish tint, perhaps due to fine microtrichia. Vesicle typical of genus.

Female. Forewing length 10-10.5 mm. Subgenital plate covers most of sternum 9; posterior margin truncate ( Fig. 41 ). Lateral bars distinct on sternum 9; mesal field with few setate.

Egg. Unknown.

Larva. Pre-emergent body length 7 mm. Body brown with dorsal maculations on thorax and abdomen ( Fig. 43 ). Thorax with supracoxal gill on mesothorax and metathorax under wingpads; gills absent from prothorax and all thoracic sterna; each paraproct with a single dorsal, slender gill filament; ventral apex of tergum 10 with a similar median gill filament. Metasternum truncate and completely fringed with erect clavate setae, lateral margins partially fringed around coxal bases and continuing onto sternal plate near furcal pits. Mesosternum with subapical and midlateral short bristle rows; prosternum with complete anterior and short subapical bristle rows. Abdominal sterna with complete posterior fringes of similar erect, clavate setae. Cerci with ca. 40 segments; ventral segmental whorls armed with 4-5 large, erect, blade-like setae on most segments.

Etymology. The species name refers to the unmodified apical area of the male basal cercal segment.

Diagnosis. Males of this species key to C. kumari in Stark (1989) but the abdominal apex is more rounded in that species and the female has a parabolic rather than truncate subgenital plate. In addition, the aedeagal armature of C. kumari is separated into two distinct ventral patches whereas in C. simplex the setation is clustered in a single large ventral patch. C. kumari is also somewhat larger with forewing length of 13-15 mm among male specimens.

Figures

Figs. 39-42. Cryptoperla simplex. 39. Head and pronotum, 40. Male terminalia, dorsal, 41. Female terminalia, 42. Aedeagus, ventral.

Fig. 43. Cryptoperla simplex larval habitus.