Isoperla sextuberculata Huo & Du, 2020

Huo, Qing-Bo & Du, Yu-Zhou, 2020, A new remarkable Isoperla species with abdominal processes from Hubei Province of Central China (Plecoptera: Perlodidae), Zootaxa 4801 (3), pp. 552-558 : 553-554

Isoperla sextuberculata Huo & Du , sp. nov.

General color yellowish to brown ( Fig. 1 ). Head mostly yellowish except the areas between posterior ocelli to occiput are darker brown. Triocellate, anterior ocellus smaller than posterior ones. Antennae and palpi dark brown. Pronotum disc yellowish laterally and dark brown medially; rugosities present medially ( Fig. 2 ). Legs yellowish, tibia brown. Wings hyaline, veins dark brown ( Fig. 1 ).

Male: Forewing length ca. 15 mm, hindwing length 13 mm, body length 13 mm. Abdomen brown and slightly sclerotized ( Fig. 3 ). Terga 4–9 bearing a horizontal line of median erect hairs. A pair of hirsute processes presents on terga 4 (short and tuberculiform in shape), 7 and 8 (finger-like). Terga 5–6 with a pair of small lateral spots composed of darken setae ( Figs. 3–4 ). Paraprocts short, triangular; membranous dorsally and slightly sclerotized ventrally, terminal upcurved and blunt ( Fig. 5 ). Vesicle reduced as a dark spot on posterior margin of sternum 8, posterior margin with thicker median setae. Posterior margin of sternum 9 rounded ( Fig. 6 ).

Female: Forewing length ca. 15 mm, hindwing length 13 mm, body length 15 mm. Body coloration similar to male. Subgenital plate broadly triangular, terminal bilobed with an obscure median notch ( Fig. 7 ).

Egg: Unknown.

Nymph: Unknown.

Type material: Holotype: ♂, China, Hubei Province, Shennongjia area, Guitouwan, 2150 m, 110°08.872′E, 31°28.439′N, 2011-V-25 ~28, leg. Li Ze-Jian ( Insect Collection of Yangzhou University ) ; Paratypes: 2 ♀♀, the same data and locality as the holotype ( Insect Collection of Yangzhou University ) .

Distribution: China, Hubei Province.

Etymology: Name of the species refers to the six processes on male terga.

Diagnosis: The abdominal processes of the new species are unlike any other known species of Asian Isoperla and species currently placed in Kaszabia Raušer, 1968 ( Table 1). Unfortunately, it was not possible to examine the aedeagus of the single male, the holotype.

Figures

FIGURE 1. Isoperla sextuberculata sp. nov., male habitat.

FIGURE 2. Isoperla sextuberculata sp. nov., male, head and pronotum.

FIGURE 3. Isoperla sextuberculata sp. nov., male abdomen, dorsal view.

FIGURE 5. Isoperla sextuberculata sp. nov., male paraprocts.

FIGURE 6. Isoperla sextuberculata sp. nov., male abdomen, ventral view.

FIGURE 7. Isoperla sextuberculata sp. nov., female, subgenital plate, ventral view.