Parisoperla oncocauda (Huo & Du, 2018), comb. nov.

Isoperla oncocauda Huo & Du, 2018 .

Type locality: Tianmu Mountain, Zhejiang Province .

Distribution: China (Zhejiang).

Mature nymph: Body length c.a. 16 mm. Gills absent. Body covered with dark hair. Maculation of head and thorax typical of other Isoperlinae; M line and ecdysial line obvious. Mouthpart as shown in Fig. 3. Ventral tibial fringe absent. Wing pads subtriangular. Abdomen with a longitudinal pale band; paraprocts short; cerci long with setal fringe (Fig. 2).

Material examined: 1 nymph, China, Zhejiang Province, Lin’an City, Tianmu Mountain Nature Reserve, Wuliting, 861m, 30°20.228′N, 119°26.136′E, 2018-IV-22, leg. Gao Peng. The same locality and data as holotype and paratypes of this species (ICYZU).

Remarks: Only a single nymph available of the new genus from Tianmu Mountain was available for study. In the new genus, the Y-arms of the mesosternum and mandibles appear to be most similar to nymphs of Calliperla and Isoperla (Szczytko & Stewart 1984, Stewart & Stark 1993). The lacinia of P. oncocauda is similar to C. luctuosa (Banks, 1906) with the apex curved and inner margin straight (Szczytko & Stewart 1984), but the inner lacinial setal row of P. oncocauda is only present on the anterior apex angle, not reaching the base and sparser than C. luctuosa (about 8 thick setae and 20 fine hairs). No additional seta or setal patches occur on the surface of the lacinia.