Microperla retroloba ( Wu, 1937 )

Chen, Zhi-Teng, Du, Si-Kai, Jia, Xu, Liang, Ju-Pen & Yu, Ji-Hui, 2021, Holomorphology and neotype designation of Microperla retroloba (Wu, 1937), Zootaxa 5061 (3), pp. 573-583 : 574-577

publication ID	https://doi.org/ 10.11646/zootaxa.5061.3.10
publication LSID	lsid:zoobank.org:pub:7E23A70E-9C0B-4373-BAFC-99B71A7AC376
DOI	https://doi.org/10.5281/zenodo.5649687
persistent identifier	https://treatment.plazi.org/id/03A387C0-FFAD-FFFE-2080-FE26E2895C80
treatment provided by	Plazi
scientific name	Microperla retroloba ( Wu, 1937 )
status

Treatment

Microperla retroloba ( Wu, 1937) View in CoL

Figs. 1–11 View FIGURE 1 View FIGURE 2 View FIGURE 3 View FIGURE 4 View FIGURE 5 View FIGURE 6 View FIGURE 7 View FIGURE 8 View FIGURE 9 View FIGURE 10 View FIGURE 11 .

Isoperla retroloba Wu, 1937: 297–307 View in CoL ; Wu, 1938: 196.

Microperla retroloba: Du & Shen, 1999: 227 View in CoL ; Du & Sivec, 2005: 41; Yang & Li, 2018: 53.

Type information. 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) .

Material examined. Neotype: male, China, Ningxia Hui Autonomous Region, Guyuan City, Liupan Mountain ( Figs. 1 View FIGURE 1 , 2 View FIGURE 2 ), 35.3641 N, 106.3115 E, 2000 m, 24 May 2021, leg. Si-Kai Du (ICJUST) GoogleMaps . Paratypes: 39 males, 13 females, 17 larvae, 38 exuviae, same locality and data as neotype (ICJUST) GoogleMaps .

Male. Body ( Fig. 3 View FIGURE 3 ) length 6.0–7.0 mm (N = 40). Body generally dark brown. Head ( Fig. 3 View FIGURE 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 View FIGURE 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 View FIGURE 3 ). Terga 8–9 pale and unmodified. Tergum 10 with a membranous median area; posteromedial margin sclerotized and curved upwards ( Fig. 4A View FIGURE 4 ). Sternum 9 extended backwards, posterior margin rounded or subtriangular. Ventral lobe pale and rounded, width subequal to length, slightly constricted near base ( Fig. 4B View FIGURE 4 ). Epiproct and paraprocts membranous and covered by short spines. Aedeagus elongated and mostly membranous ( Fig. 5A–D View FIGURE 5 ), 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.

Female. Body ( Fig. 6A View FIGURE 6 ) length 7.0– 7.5 mm (N = 13). Color pattern similar to males. Abdominal tergum 10 slightly projected backwards ( Fig. 6A View FIGURE 6 ). Subgenital plate large and broad, bilobed with a shallow posterior notch or truncate at posterior margin, covering half of sternum 9 ( Fig. 6B View FIGURE 6 ).

Larva. Body ( Fig. 7 View FIGURE 7 ) length 6.0–7.0 mm (N = 17). Head mostly dark brown, medially with a dark stigma covering ocelli ( Fig. 8A–B View FIGURE 8 ); compound eyes dark and glabrous; dorsal surface and margins of head with long pale spines. Antennae pale brown and slender ( Fig. 8C–E View FIGURE 8 ), subequal to body length, each segment covered with spinules and apically fringed with moderate spines. Glossae of labium slightly longer than paraglossae ( Fig. 9A View FIGURE 9 ). 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 View FIGURE 9 ); 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 View FIGURE 9 ), 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 View FIGURE 8 ), 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 View FIGURE 8 ). 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 View FIGURE 10 ). 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 View FIGURE 10 ). 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 View FIGURE 8 ), 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 View FIGURE 10 ), slightly shorter than abdomen, each segment with short to moderate cylindrical apical spines, length of which does not exceed the segment length.

Egg. Disc shaped, typical for Peltoperlidae ( Fig. 11 View FIGURE 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 View FIGURE 11 ). Impressions on circular lid conspicuous ( Fig. 11B, D View FIGURE 11 ).