Sinacroneuria complana Xiang & Du, 2022

Xiang, Ya-Nan, Huo, Qing-Bo & Du, Yu-Zhou, 2022, Three new species of Sinacroneuria Yang & Yang, 1995 (Plecoptera: Perlidae) from Zhejiang Province, southeastern China, Zootaxa 5175 (4), pp. 487-493 : 489

Sinacroneuria complana Xiang & Du , sp. nov.

Figs. 2a–2e

Adult habitus. General body color yellow brown. Head yellowish with a light brown spot covering ocellar triangle; triocellate, lateral ocelli margined by black pigmentation, anterior ocellus smaller ( Fig. 2a ). Antenna yellow brown and palpi yellow brown. Pronotum rectangular with irregular rugosities ( Fig. 2a ). Legs mostly yellow brown. Wings hyaline with veins brown.

Male. Body length 13.8–14.5 mm, forewing length 15.8–16.2 mm, hindwing length 14.0– 14.1 mm (n = 4). Tergum 9 with few sensilla basiconica posteriorly; tergum 10 bearing a larger patch of sensilla basiconica ( Figs. 2b, 2d ); paraprocts sclerotized, curved upward in a hook shape to the posterior margin of tergum 10 ( Fig. 2d ). Sternum 9 with an oval hammer at the middle of the posterior margin ( Fig. 2c ).

Aedeagus mostly membranous. Aedeagal sclerites sclerotized, stem slender, length nearly same as Y-arms. Y-arms wide and flat, long and triangular in shape, connected with stem at near 1/2 of the length; base wide, apex concave and tapering outward and hook shaped; lateral sclerites slender and slightly sclerotized, the width was ca. 1/3 times of Y-arms; medial sclerite basally thick, apex tapering with tiny spines ( Fig. 2e ).

Female. Unknown.

Type material. Holotype: male, China: Zhejiang Province, Wenzhou City, Taishun County, Wuyanling National Nature Reserve , 680 m, 2005-V-7, leg. Wang Yi-Ping. Paratypes: 3 males, same data as the holotype .

Etymology. The name complana (from the word complanate) refers to the sclerites of aedeagus that are wide and flat.

Distribution. China, Zhejiang Province.

Diagnosis. Sinacroneuria complana sp. nov. is similar to S. acuticornis Uchida, 2017 by sharing similar structural characteristics of the aedeagal Y-arms. The lateral sclerites of aedeagus of S. complana are slender and nearly equal to the Y-arms ( Fig. 2e ), while that in S. acuticornis are shorter and about 1/2 length of the Y-arms (Figs. 42–44 in Li et al. 2017). Additionally, the tergum 9 sensilla basiconica patch of S. complana ( Fig. 2d ) is markedly sparser compared to S. acuticornis (Fig. 38 in Li et al. 2017). Sinacroneuria complana sp. nov. is also easily separated from S. lateralis Sivec & Stark, 2020 . The apex of Y-arms in S. lateralis ( Fig. 1g in Sivec & Stark 2020) are more separated from each other yet closed to each other in S. complana ( Fig. 2e ).

Figures

FIGURE 1. Sinacroneuria parallela sp. nov., male. a. head and pronotum, dorsal view; b. abdominal terminalia, dorsal view; c. abdominal terminalia, ventral view; d. aedeagus sclerites, dorsal view; e. median aedeagal sclerite, lateral view.

FIGURE 2. Sinacroneuria complana sp. nov., male. a. head and pronotum, dorsal view; b. abdominal terminalia, dorsal view; c. abdominal terminalia, ventral view; d. abdominal terga 9–10, details; e. aedeagal sclerites, dorsal view.