Capnia yunnana Li & Yang

Li, Weihai, Kong, Fanbin & Yang, Ding, 2011, A new species of Capnia (Plecoptera: Capniidae) from China, Zootaxa 2943, pp. 63-68 : 66-68

Capnia yunnana Li & Yang , sp. nov.

( Figs. 1–11 )

Diagnosis. This species is defined by tergum 9 being slightly produced posteriorly to form a darkly sclerotized, heart–shaped marking and by a triangular bifurcate epiproct. Sternum 9 bears a tongue–shaped vesicle that is covered with dense hairs.

Male ( Fig. 1 ). Body length 3.6 - 4.0 mm. Wings macropterous. Forewing length 4.6 - 4.8 mm, hindwing length 4.0 - 4.1 mm. Body generally dark brown. Head rounded, slightly wider than pronotum; compound eyes dark. Pronotum evenly dark, trapezoidal, corners obtuse. Wings ( Fig. 2 ) membrane subhyaline with pale areas, veins brown, R vein slightly curved at its divergence with Rs. Abdominal pigmentation dark brown, terga 1-8 with median portion pale brown.

Terminalia. Terga 7 through 9 each with shallow indentation and narrow sclerotized band at anterior margins ( Fig. 3 ). Tergum 9 with a medial, slightly elevated posteromedial lobe, forming a darkly sclerotized heart-shaped marking. Sternum 9 ( Fig. 6 ) with tongue-shaped vesicle, covered by dense hairs; subgenital plate trapezoidal, wide basally and gradually tapering toward tip. Tergum 10 ( Fig. 3 ) strongly sclerotized at anterior margin, with a deep quadrate indentation. Cercus slender, 13 segmented, each distal portion enlarged with long hairs ( Fig. 8 ). Epiproct ( Figs. 5 & 7 ) nearly triangular and bifurcate, slightly constricted at base with a knob at basolateral corner ( Fig. 9 ), elevated medially ( Fig. 10 ), then distinctly sloping down apically in lateral view, apex slightly swollen with many pits ( Fig. 11 ).

Female. Body length 3.8 - 4.0 mm. Forewing length 5.5 - 5.7 mm, hindwing length 4.5 - 4.6 mm. Sterna 5-7 with posteromedian margin sclerotized. Sternum 8 with a triangular median sclerite, its tip nearly rectangular, covering anterior margin of sternum 9 ( Fig. 4 ).

Type material. Holotype: male ( HIST), Paratypes: 3 males and 3 females, China: Yunnan Province, Deqin County, Baima snow mountain, 2009. IV.13, Weihai Li. Paratypes: 1 male and 1 female ( CAU), same data as holotype.

Etymology. The specific epithet refers to the province where the type locality of the new species is located.

Distribution. China (Yunnan Province).

Remarks. The new species belongs to the C. cordata species group sensu Zhiltzova (2003). It is related to C. cordata from Tibet and C. qilianshana from Guansu in having a similar epiproct and a posteromedial marking on tergum 9, but may be easily separated from them by the nearly triangular and bifurcate apex. Both C. cordata and C. qilianshana have an elongate entire epiproct. Additionally, the epiproct of C. cordata is pointed and hooked apically in lateral view whereas C. qilianshana has a straight R vein of the front wing which differentiates it from the remainder species ( Kimmins 1947; Li & Yang 2009).

Figures

FIGURES 1 – 4. Capnia yunnana sp. nov. 1. Male habitus, dorsal view. 2. Forewing, dorsal view. 3. Male terminalia, dorsal view. 4. Female terminalia, ventral view.

FIGURES 5 – 6. Capnia yunnana sp. nov. (male). 5. Terminalia, dorsal view. 6. Terminalia, ventral view.

FIGURES 7 – 9. Capnia yunnana sp. nov. (male). 7. Epiproct, dorsal view. 8. Cercus segments 7 - 9, dorsal view. 9. Epiproct base, lateral view.

FIGURES 10 – 11. Capnia yunnana sp. nov. (male). 10. Epiproct, lateral view. 11. Epiproct apex, lateral view.