Agnetina zwicki, Stark & Sivec, 2008

Stark, Bill P. & Sivec, Ignac, 2008, New Stoneflies (Plecoptera) From Asia, Illiesia 4 (1), pp. 1-10 : 6

Agnetina zwicki sp. n.

( Figs. 14-17 )

Material examined. Holotype ♂ from China, Sichuan, Emei Shan , 3077 m, 8 August 2007, M. Hrovat ( PMSL).

Adult habitus. General color dark brown. Head dark over most of frons; M-line and occiput pale ( Fig. 14 ). Pronotum brown with indistinct rugosities. Femora and tarsi dark brown, tibiae paler except on proximal and distal ends. Cerci pale basally, darker distally. Wings uniformly brown. Abdomen pale except laterally along dark brown pleura.

Male. Macropterous, forewing length 17 mm. Tergum 5 lobe rounded and extending over base of tergum 6 ( Fig. 15 ); mesal field of tergum 6 forming a sclerite that extends almost to posterior margin of tergum. Terga 7-8 sclerotized laterally and along base but with large membranous, mesal field. Hemiterga relatively short, reaching at least to mid-point of tergum 8; apices curved inward in dorsal aspect and bearing a prominent dorsolateral hump opposite “heel” ( Figs. 15, 17 ); lateral aspect of hemiterga with prominent notch forward of hump ( Fig.16 ).

Female. Unknown.

Larva. Unknown.

Etymology. The patronym honors our friend and colleague, Professor Dr. Peter Zwick, in recognition of his important work on this genus ( Zwick 1984).

Diagnosis and Discussion. Agnetina has been the subject of recent systematic studies in China (Du & Chou 1998; Sivec & Zhiltzova 1997) and the Eastern Palearctic ( Sivec et al. 2005), and new Asian species have also been proposed by Cao & Bae (2006) and Stark & Sivec (1991). This new species is distinct from others by virtue of the rounded lobe on tergum 5 and the short hemiterga with a strong basal hump. Agnetina cadaverosa (McLachlan) also has short hemiterga but these lack the basal hump and the process on tergum 5 is notched in that species.

Figures

Figs. 14-17. Agnetina zwicki. 14. Head and pronotum, 15. Male abdominal terga 5-10, 16. Male abdominal segments 5-10, lateral aspect, 17. Left hemitergum, dorsal aspect.