Flavoperla basomarginata Chen, 2019

Chen, Zhi-Teng, 2019, On the identity of the genus Flavoperla (Plecoptera: Perlidae), with description of a new species in southwestern China, Zootaxa 4613 (1), pp. 127-134 : 128-129

publication ID

https://doi.org/ 10.11646/zootaxa.4613.1.6

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scientific name

Flavoperla basomarginata Chen

sp. nov.

Flavoperla basomarginata Chen View in CoL , sp. nov.

Figs. 1–7 View FIGURE 1 View FIGURE 2 View FIGURE 3 View FIGURE 6 View FIGURE 7

Adult habitus. Biocellate. Body color generally pale brown ( Fig. 1 View FIGURE 1 ). Head pale with obscure M-line; two oval callosities located laterad to ocelli ( Fig. 1B View FIGURE 1 ). Antennae pale brown, length subequal to half of the body length. Maxillary palpi pale, four-segmented with apical segment shortest; labial palpi three-segmented with apical segment shortest ( Fig. 1C View FIGURE 1 ). Pronotum sub-trapezoidal with brown sutures and rugosities, anteromedial margin slightly protruded; meso- and metanota pale. Wings hyaline, veins brown. Legs generally pale, tarsal claws darker; two tibia spurs present. Abdominal segments generally pale, each segment with posterolateral setae. Cercus brown, about twelve-segmented, each segment with strong setal whorls.

Male. Body length ca. 15.0 mm; forewings length ca. 16.5 mm, hindwings length ca. 14.0 mm. Abdominal tergum 10 with a pair of subtriangular, posterolateral spines on either side of median epiproct sclerite; epiproct sclerite “butterfly-shaped” with short wide stem and short arms, apex blunt; darker plots of tergum 10 present anterior to arms of epiproct sclerite ( Figs. 2 View FIGURE 2 A–B). Paraprocts claw-shaped, slightly upcurved, basolateral margins strongly sclerotized and connected with base of cerci ( Fig. 3 View FIGURE 3 ). Sternum 9 with a long bell-shaped hammer located medially; the hammer projected reaching posterior margin of sternum 9, boot-shaped from lateral view, mostly membranous with sclerotized apex ( Figs. 3 View FIGURE 3 –4). The aedeagus generally membranous (Figs. 4C, 4D), ventrally with two oval lobes connected to the broad base, apex rounded, narrower than base and with two lateral spines; the aedeagus ventroapically with an arched sclerite, which is the ventral apex of the dorsal heart-shaped lobe; two obscure dorsal lobes also present in half-length of the aedeagus.

Female. Body length ca. 17.0 mm ( Fig. 1D View FIGURE 1 ); forewings length ca. 18.0 mm, hindwings length ca. 15.0 mm. Subgenital plate semielliptical, originated from sternum 8, reaching midpoint of sternum 10 (Fig. 5). Sternum 9 embedded posteromedially. Paraprocts subtriangular in shape.

Type material. Holotype male: China: Sichuan Province, Chongzhou City, Anzihe Nature Reserve, Shaoyaogou , a fast-flowing small stream along the road ( Fig. 6 View FIGURE 6 ), 1598 m, 30°47.95′ N, 103°122.70′ E, 19 June 2016 (ICJUST) . Paratypes: 19 males and 3 females, same locality and data as holotype (ICJUST) .

Etymology. The specific epithet refers to the sclerotized basal margin of the male paraproct.

Diagnosis. The new species is similar to F. dao Stark & Sivec, 2008 , F. hmong Stark & Sivec, 2008 and F. pallida Stark & Sivec, 2008 from Vietnam, but the male can be distinguished from F. dao by the larger spines on tergum 10, the basolaterally sclerotized paraprocts, and by the much larger, laterally boot-shaped hammer (see figs. 2–4 in Stark & Sivec 2008). Males of F. basomarginata can be separated from F. hmong by the unpigmented head, the butterfly-shaped epiproct sclerite, and by the shorter basal stem of the hammer (see figs. 6–9 in Stark & Sivec 2008). The new species can also be separated in the male from F. pallida by the larger spines on tergum 10, the butterfly-shaped epiproct sclerite, the much larger, boot-shaped hammer, and by the unmodified female subgenital plate (see figs. 12–15 in Stark & Sivec 2008). The following key can be used to separate the known males of species of Flavoperla . The aedeagus of the new species appears different from that of F. pallida (see fig. 16 in Stark & Sivec 2008). However, comparison of aedeagi among all Flavoperla species is currently impossible due to lack of comparable data.













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