Perlodinella mazehaoi Chen 2019, sp. nov.
Creators: name: Chen, Zhi-Teng
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Plecoptera
Perlodidae
Perlodinella
Perlodinella mazehaoi

description: Perlodinella mazehaoi sp. nov.
Figs. 1–10.
Adult habitus (Figs. 1, 2). Body generally dark. Head mostly dark brown; anterior of head with a pale fusiform stripe followed by a M-shaped pale mark, posterior of head with a hammer-shaped stigma; posterolateral areas of head each with a pale oval spot. Triocellate, anterior ocellus smaller than posterior ones. Antenna dark brown and slender, slightly longer than the abdomen. Pronotum subquadrate, generally dark brown except for the anteriorly widened, pale median stripe. Meso- and metanota dark brown; mesothoracic furcasterum branches reaching posterior end of the furcal pits. Males brachypterous or macropterous, female macropterous; wings pale brown, veins brown. Legs generally pale, apex of femur and base of tibia dark. Abdominal segments generally dark in males; abdominal sternum 1 completely fused with metathorax; abdominal segments 1–3 divided into distinct terga and sterna. Cerci slender, subequal in length to two-thirds of the body, generally brown, each segment with apical bristles.
Male (Figs. 2 A–B, 3A–B, 4–8). Body length ca. 13.0 mm; forewings length 9.5–11.0 mm, hindwings length 8.0– 9.5 mm. In the forewing, apex with an irregular net; four crossveins present between C and Sc; RP with five apical branches; CuA with three branches; anal are with five branches. In the hind wing, RP with four apical branches; anal area very large, with eight anal branches. Abdominal terga 6–9 with pale lateral spots and humped, pale posterior margins which are laterally covered by long hairs. Tergum 9 divided by a transverse suture, anterior half sclerotized with two posterior projections; posterior half of tergum 9 covered with sensilla basiconica and thick spines. Tergum 10 weakly sclerotized and with a subtriangular concave at anterior half; posterior half sclerotized, covered with short hairs and abruptly recurved; in caudal view, the projection of tergum 10 subtriangular with a tongue-shaped apex, the apex ventrally covered with sensilla basiconica. Sternum 8 with a rounded, unpigmented area at anterior margin. Sternum 9 anteriorly with a trapezoidal, unpigmented area, posteriorly elongated backwards with a rounded apex. Paraproct divided into an upper membrane and a lower sclerite; the upper membrane subtriangular, apex with a short, pale brown stripe; the lower sclerite waterdrop-shaped, apical half slender with a blunt tip. Aedeagus membranous, slender, subapically with a curve; apex subquadrate from ventral view, rounded from lateral view, surface covered with spinules.
Female (Figs. 1A, 2C, 3C, 9). Body length ca. 15.0 mm, forewings length ca. 14.0 mm, hindwings length ca. 11.5 mm. Color pattern generally similar to male; abdominal sterna 1–7 with a dark brown median stripe. Anterior margin of sternum 8 with two subtriangular spots; median area of sternum 8 membranous and covered with thick bristles; subgenital plate broad with incurved posterior margin, the posterior margin medially with two small lobes, reaching half-length of sternum 9; width of the subgenital plate approximately two-thirds of sternum 8.
Egg (Fig. 9C). Trilateral, with three longitudinal ridges. Collar slender, cylindrical with a broad base. Anchor mushroom-shaped, evenly covered with small globular bodies. Each side of the egg with a short transverse row of micropyles, the micropyles with elongated rims. Chorion surface rugose, covered with small tubercles.
Type material. Holotype: male, China: Inner Mongolia, Hohhot City, Daqing Mountain, Xiaojinggou Stream, a small, slow-flowing stream (Fig. 10), 41.0004 N, 111.8358 E, 1395 m, May 28, 2019, leg. Ze-Hao Ma (ICJUST). Paratypes: one male and one female, same locality and data as holotype (ICJUST).
Etymology. The species is named for Mr. Ze-Hao Ma who collected and generously provided the specimens for study.
Remarks. The new species can be distinguished from congeners by the lateral hairy patches on abdominal terga, the long triangular paraprocts in males, and by the posteriorly depressed subgenital plate in the female. In P. apicalis, the femora are dark brown, which are mostly yellow in P. mazehaoi; posterior projection of tergum 10 has a length twice than width, which is at least five times longer than width in P. mazehaoi; paraprocts have recurved apical hooks, which are absent in P. mazehaoi (see fig. 14 in Kimmins 1947). In P. fuliginosa, terga 7–9 of the male have mesal hair patches, which are located laterally in P. mazehaoi; the sensilla basiconica ventral to male tergum 10 do not reach the apex of the projection, which reaches the apex in P. mazehaoi; the female has median V-shaped spot and paired lateral spots on abdominal sterna 2–7, paired posterior spots on subgenital plate, and lateral spots on sternum 9, which are all absent in P. mazehaoi (original description in Chinese, see figs. 72–75 in Wu 1973). In P. kozlovi, male paraprocts are slender, and female subgenital plate is inverted triangular with a pointed posterior apex (see figs. 23, 24 in Klapálek 1912), while in P. mazehaoii, the male paraprocts are long triangular, the female sub- genital plate has a depressed posterior margin. In P. microlobata, tergum 10 of the male is slightly upcurved without a tongue-shaped apex, paraprocts are small and membranous; female has no marks on abdominal sterna, the subgenital plate is trilobed (see figs. 279–282 in Wu 1938). In P. tatunga, abdominal terga 7–9 of the male have mesal hair patches, which are located laterally in P. mazehaoi; the female has lateral spots on abdominal sterna 5–9, which are absent in P. mazehaoi; the female subgenital plate is trilobed, completely different from P. mazehaoi (original description in Chinese, see figs. 68–71 in Wu 1973). In P. unimacula, subgenital plate of the female holotype has three sharp posterior angles, which are absent in P. mazehaoi (see fig. 25 in Klapálek 1912).
description: Published as part of Chen, Zhi-Teng, 2019, Perlodinella mazehaoi sp. nov., a new species of Perlodidae (Plecoptera) from Inner Mongolia of China, pp. 297-304 in Zootaxa 4651 (2) on page 298, DOI: 10.11646/zootaxa.4651.2.6, http://zenodo.org/record/3995553