Microperla retroloba
Creators: name: Chen, Zhi-Teng
name: Du, Si-Kai
name: Jia, Xu
name: Liang, Ju-Pen
name: Yu, Ji-Hui
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Plecoptera
Peltoperlidae
Microperla
Microperla retroloba

description: <i>Microperla retroloba</i> (Wu, 1937) Figs. 1–11. <i>Isoperla retroloba</i> Wu, 1937: 297–307; Wu, 1938: 196. <i>Microperla retroloba</i>: Du &amp; Shen, 1999: 227; Du &amp; Sivec, 2005: 41; Yang &amp; Li, 2018: 53. <b>Type information.</b> Holotype: male, China, S. E. Kansu (= southeast of Gansu Province), Cheumen (= Shimen Town, Longnan City), 6 May 1919, Rev. E. Licent, originally deposited in Musée Hoang ho Pai ho of Tientsin (= Tianjin Natural History Museum) but lost according to Wu (1962). Paratype: one female, same locality and data as holotype (lost according to Wu 1962). <b>Material examined.</b> Neotype: male, China, Ningxia Hui Autonomous Region, Guyuan City, Liupan Mountain (Figs. 1, 2), 35.3641 N, 106.3115 E, 2000 m, 24 May 2021, leg. Si-Kai Du (ICJUST). Paratypes: 39 males, 13 females, 17 larvae, 38 exuviae, same locality and data as neotype (ICJUST). <b>Male.</b> Body (Fig. 3) length 6.0–7.0 mm (N = 40). Body generally dark brown. Head (Fig. 3) with a dark median area. Triocellate, anterior ocellus largely reduced; compound eyes small rounded and protruding. Antennae slender and pale brown. Pronotum sub-rectangular with obtuse corners, median area darkly pigmented and laterally pale; posteromedial margin of pronotum pale. Macropterous (Fig. 3); wings hairy and subhyaline, veins pale brown. Two extra crossveins present beyond Sc. Legs generally pale brown, joints dark. Abdominal segments mostly dark brown (Fig. 3). Terga 8–9 pale and unmodified. Tergum 10 with a membranous median area; posteromedial margin sclerotized and curved upwards (Fig. 4A). Sternum 9 extended backwards, posterior margin rounded or subtriangular. Ventral lobe pale and rounded, width subequal to length, slightly constricted near base (Fig. 4B). Epiproct and paraprocts membranous and covered by short spines. Aedeagus elongated and mostly membranous (Fig. 5A–D), ventrally with two curved, finger-shaped, spinulose lobes; apex rounded with three small lobes. Cerci short, generally pale brown, with 5–7 segments, basal segment unmodified. <b>Female.</b> Body (Fig. 6A) length 7.0– 7.5 mm (N = 13). Color pattern similar to males. Abdominal tergum 10 slightly projected backwards (Fig. 6A). Subgenital plate large and broad, bilobed with a shallow posterior notch or truncate at posterior margin, covering half of sternum 9 (Fig. 6B). <b>Larva.</b> Body (Fig. 7) length 6.0–7.0 mm (N = 17). Head mostly dark brown, medially with a dark stigma covering ocelli (Fig. 8A–B); compound eyes dark and glabrous; dorsal surface and margins of head with long pale spines. Antennae pale brown and slender (Fig. 8C–E), subequal to body length, each segment covered with spinules and apically fringed with moderate spines. Glossae of labium slightly longer than paraglossae (Fig. 9A). Galea of maxilla broad, inner margin with a row of moderately long, stout apical spines, apex with a huge crescent hairbrush on ventral aspect (Fig. 9B–C); lacinia long triangular, with several apical teeth and an inner comb of short marginal spines. Mandible with two pointed apical teeth and a bilobed basal tooth (Fig. 9D–E), ventral aspect with a huge hairbrush, dorsal aspect with a marginal comb of thick spines posterior to the basal tooth; molar area pale. Pronotum wide and short with obtuse corners (Fig. 8A), mostly dark brown, medially scattered with dark spots, covered and fringed with long cylindrical spines. Meso- and metanota dark brown, covered and fringed with long cylindrical spines. Wing pads dark, outer margins circular and fringed with dense long spines. Coxae and trochanters ventrally with moderate spines along posterior margins (Fig. 8B). Femora dorsally covered and fringed with dense, long cylindrical spines, ventrally with a longitudinal row of sparse spines and partially covered with conspicuous granules; outer margin with several moderately long swimming hairs (Fig. 10A–F). Tibiae dorsally with a longitudinal median row of long spines, inner margin fringed with short spines, outer margin with dense long spines and moderately long swimming hairs; ventral surface of tibiae near glabrous (Fig. 10A–F). Two stout tibial spurs present. Tarsal segments with short pines along inner margin, with long swimming hairs along outer margin. Claws sharp and glabrous. Abdominal segments dark dorsally and pale brown ventrally (Fig. 8A–B), each segment covered and posteriorly fringed with long cylindrical spines. Tergum 10 projected backwards, near triangular in shape. Paraprocts conical and sharp, apical half covered by long spines. Cerci mostly brown (Fig. 10G–H), slightly shorter than abdomen, each segment with short to moderate cylindrical apical spines, length of which does not exceed the segment length. <b>Egg.</b> Disc shaped, typical for Peltoperlidae (Fig. 11), diameter approximately 0.2 mm (N = 2). Irregular follicle cell impressions present on entire chorionic surface; dorsal aspect with a circular depression, the cells in which obscure (Fig. 11A, C). Impressions on circular lid conspicuous (Fig. 11B, D).
description: Published as part of <i>Chen, Zhi-Teng, Du, Si-Kai, Jia, Xu, Liang, Ju-Pen &amp; Yu, Ji-Hui, 2021, Holomorphology and neotype designation of Microperla retroloba (Wu, 1937), pp. 573-583 in Zootaxa 5061 (3)</i> on pages 574-577, DOI: 10.11646/zootaxa.5061.3.10, http://zenodo.org/record/5649685
description: {"references": ["Wu, C. F. (1937) The stoneflies of China (Order Plecoptera). Bulletin of the Peking Society of Natural History, 11, 297 - 307.", "Wu, C. F. (1938) Plecopterorum sinensium: A monograph of stoneflies of China (Order Plecoptera). Yenching University, Beijing, 225 pp.", "Du, Y. Z. &amp; Shen, X. C. (1999) In: Shen, X. C. &amp; Pei, H. C. (Eds.), The Fauna and Taxonomy of Insects in Henan. Vol. 4. The Fauna of Insects of Southern Funiu Mountain and Dabie Mountain. China Agricultural Science and Technique Press, Beijing, pp. 227 - 230.", "Du, Y. Z. &amp; Sivec, I. (2005) In: Yang, X. K. (Ed.), Insect Fauna of Middle-west Qinling Range and South Mountains of Gansu Province. Science Press, Beijing, pp. 38 - 54.", "Yang, D. &amp; Li, W. H. (2018) Species catalogue of China. Vol. 2 Animals, Insecta (III), Plecoptera. Science Press, Beijing, 71 pp.", "Wu, C. F. (1962) Results of the zoologico-botanical expedition to southwest China, 1955 - 1957 (Plecoptera). Acta Entomologica Sinica, 11 (Supplement), 139 - 153."]}