Etrocorema yunnanensis Chen 2020, sp. nov.
Creators: name: Chen, Zhi-Teng
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Plecoptera
Perlidae
Etrocorema
Etrocorema yunnanensis

description: <i>Etrocorema yunnanensis</i> sp. nov. Figs. 2–7. <b>Adult habitus.</b> General color yellow, patterned with brown (Figs. 2, 6). Biocellate; head slightly wider than pro- notum, with a frontal stigma and a dark, hexagonal stigma covering the ocelli (Fig. 3 A–B). Pronotum pale, sutures dark brown, covered with conspicuous rugosities. Wing membrane pale brown and subhyaline, veins dark brown (Fig. 3 C–D). Coxae pale; apical half of femora brown; tibiae and tarsi dark brown. Cercus pale, covered with pale bristles. <b>Male.</b> Body length ca. 12.0 mm. Metasternum and abdominal sternum 6 each with a median patch of dense bristles; sternum 7 with a sparse bristle patch <b>(</b> Fig. 2B). Posterolateral margins of terga 7–9 fringed with dense, dark brown bristles <b>(</b> Figs. 2, 4). Posterior area of tergum 7 with two small patches of sensilla basiconica, each containing one or two sensilla basiconica <b>(</b> Figs. 2B, 4). Posterior half of tergum 8 with two large patches of sensilla basiconica (Fig. 4). Tergum 9 with two elliptical membranous area divided by the median extension of its sclerotized anterior margin; posterior margin of each membrane with a small patch of sensilla basiconica (Fig. 4). Hemitergal lobes curved and finger-shaped; apices covered with stout sensilla basiconica on all aspects; inner surfaces humped, less sclerotized and with longitudinal patches of tiny sensilla basiconica. Paraprocts membranous and unmodified (Fig. 4). Aedeagus (Fig. 5) mostly membranous and tube-like, slightly curved and constricted subapically; basal half weakly sclerotized and covered with dense granules which gradually reduced towards mid-length; middle of aedeagus transparent, ventral and dorsal aspects with scattered granules which connecting the basal and apical granular patches of aedeagus (Fig. 5 D–E); apical one-third of aedeagus covered with dense granules which rearranged into rows on apex, dorsal aspect elevated with two conspicuous ridges (Fig. 5E); apical rim of aedeagus dentate and irregular (Fig. 5D). <b>Female.</b> Body length ca. 11.5 mm; body color and head pattern identical with the male <b>(</b> Fig. 6 A–B). Sternum 8 sclerotized medially, posterior margin with a broad, shallow notch; a detached subgenital plate present beneath the posterior margin of sternum 8 (Fig. 6C). <b>Egg.</b> Egg length ca. 375 µm, equatorial width ca. 213 µm <b>(</b> Fig. 7). Color pale brown, long oval in shape; collar dark brown, wide and short. Primary striae narrow, dentate and narrowly spaced, joining rim on sides of collar. Collar short and surrounded by 1–2 irregular rows of follicle cell impressions. Lid small, truncate. <b>Type material.</b> Holotype: male, China: Yunnan Province, Mengla County, Laman Highway, 21°20′53.25″N, 101°18′33.79″E, 1400m, April 27, 2019, leg. Shen Ji (ICJUST). Paratypes: one male and one female, same data as holotype (ICJUST). <b>Etymology.</b> The new species is named after its type locality in Yunnan Province. <b>Diagnosis.</b> <i>Etrocorema yunnanensis</i> can be distinguished from <i>E. hochii</i> by the divided patches of sensilla basiconica on tergum 8, presence of sensilla basiconica on abdominal tergum 7, tergum 9 and hemitergal lobes, which are absent in <i>E. hochii</i> (see original descriptions “abdominal segments 1–9 unmodified except with a transverse row of spinules on the posterior margin of the 8th tergite…finger-like recurved process, with a more slender rounded tip not beset with spinules” and figs. 310–311 in Wu 1938). The male of <i>E. yunnanensis</i> differs from the Malaysian <i>E. belumensis</i> in having different head pattern, extra sensilla basiconica on abdominal tergum 7, an extra bristle patch on sternum 7, aedeagus with a granular base and two ridges on dorsal apex (see figs. 1–3 in Wan Nur Asiah <i>et al</i>. 2009); female of <i>E. yunnanensis</i> is distinctive from <i>E. belumensis</i> by a small detached subgenital plate rather than a large rounded one (see fig. 4 in Wan Nur Asiah <i>et al</i>. 2009); egg of <i>E. yunnanensis</i> differs from <i>E. belumensis</i> by presence of the narrowly spaced primary striae and absence of rounded pits on chorion (see figs. 8–10 in Wan Nur Asiah <i>et al</i>. 2009). The new species is most similar to <i>E. nigrogeniculatum</i>, but can be separated by the male with a different head pattern, an additional bristle patch on sternum 7, much longer apical sac of aedeagus, dense granules on base of aedeagus which extend towards apex from both dorsal and ventral aspects, and presence of dorsoapical ridges on aedeagus; the extremely large subgenital plate in female, and the absence of primary striae in eggs of <i>E. nigrogeniculatum</i> (Kawai 1968, Zwick 1973, Sivec <i>et al</i>. 1988, Wan Nur Asiah <i>et al</i>. 2009). <b>Remarks.</b> The holotype was found with a parasitic mite of Parasitidae on lateral side of abdominal segments 6–7 (Fig. 1 C–D). However, little is known about the specific correlation between parasitic mites and Chinese stoneflies, which should be an interesting topic for future studies.
description: Published as part of <i>Chen, Zhi-Teng, 2020, Etrocorema yunnanensis sp. nov., a new species of the tropical genus Etrocorema (Plecoptera: Perlidae) from China, pp. 433-439 in Zootaxa 4759 (3)</i> on pages 433-439, DOI: 10.11646/zootaxa.4759.3.10, http://zenodo.org/record/3741136
description: {"references": ["Wu, C. F. (1938) The stoneflies of China (Order Plecoptera). Bulletin of the Peking Society of Natural History, 13 (1), 53 - 87.", "Wan Nur Asiah, W. M. A., Che Salmah, M. R. &amp; Sivec, I. (2009) Description of Etrocorema belumensis sp. n. from Royal Belum State Park, Perak, Malaysia. Illiesia, 5 (17), 182 - 187.", "Kawai, T. (1968) Stoneflies (Plecoptera) from Thailand and India with descriptions of one new genus and two new species. Oriental Insects, 2 (2), 107 - 139. https: // doi. org / 10.1080 / 00305316.1968.10433877", "Zwick, P. (1973) Die Plecopteren-Arten Enderleins (Insecta): Revision der Typen. Annales Zoologici, 30, 471 - 507.", "Sivec, I., Stark, B. P. &amp; Uchida, S. (1988) Synopsis of the world genera of Perlinae (Plecoptera: Perlidae). Scopolia, 16, 1 - 66."]}