Agnetina duplistyla ( Wu, 1962 )

Zhang, Rui, Dong, Miao & Li, Weihai, 2025, Additions to the genus Agnetina Klapálek, 1907 (Plecoptera: Perlidae) from China, with a new synonym, Zootaxa 5719 (2), pp. 283-288 : 284-285

Agnetina duplistyla ( Wu, 1962)

( Figs. 1 a–c, e, f )

Neophasganophora duplistyla Wu, 1962: 140 ; Illies, 1966: 632; Zwick, 1973: 266. Agnetina duplistyla ( Wu, 1962) : Zwick, 1984: 73; Sivec et al. 1988: 27; Du & Chou, 1998: 103; Du et al. 1999: 60; Yang & Li, 2018: 26.

Type material. Holotype: male ( IZCAS), labelled “ China: Yunnan Province, Pu’er City , 1957.VI.12, leg. Shuyong Wang ” ( Fig. 1a ).

Amended description. General color dark brown ( Fig. 1b ). Tergum 5 lobe subtriangular with a bilobed apex, extending to mid-length of tergum 7 and tip of hemitergal lobe, in lateral view, the apex appearing as a large hook, dark sensilla basiconica present along posterior margins of the lobe ( Figs. 1c–f ). Hemitergal lobe branched: the upper branch is short and has a row of dark sensilla basiconica along inner margins, and the lower branch in dorsal view is blade-shaped, and in lateral view, it is S-shaped in outline, with sensilla basiconica occurring only at apex ( Figs. 1c, e ).

Distribution. It is only known from Jingdong County, Yunnan Province in southwestern China.

Remarks. Agnetina duplistyla ( Wu, 1962) was previously known only from the original descriptions and a single illustration of terminalia in dorsal view. The male of this species is externally characterized by hemitergal lobes with lower branch in dorsal view being blade-shaped bearing apical sensilla basiconica and an elongated, subtriangular, bilobed apex of tergum 5 lobe which is hooked in lateral view and covered by many sensilla basiconica. The original drawing, especially the dorsal outline of the hemitergal lobe, agrees well with our new color illustrations of the holotype ( Figs. 1c, e, f ). The large triangular pattern of tergum 5 in the type is much faded ( Fig. 1b–c ) but the distal margin of the triangle is still distinct ( Fig. 1c ).

Figures

FIGURE 1. Agnetina duplistyla (Wu, 1962). a: labels of holotype; b: habitus of holotype male, dorsal view; c: terminalia, dorsal view; d: original illustration of terminalia, dorsal view, from Wu 1962; e: terminalia, lateral view; f: posterior lobe of tergum 5, lateral view.