Amphinemura setosa Li, Yang & Li 2023, sp. nov.
Creators: name: Li, Mengyu
name: Yang, Ding
name: Li, Weihai
Publisher: name: Zenodo
Year: 2023
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Plecoptera
Nemouridae
Amphinemura
Amphinemura setosa

description: Amphinemura setosa Li, Yang & Li, sp. nov.
(Figs. 2, 3d–3f)
Male. Body length 4.8 mm. Forewing length 6.3 mm, hind wing length 5.0 (n=1). Body coloration brown. Head dark brown; antennae brown and palpi brownish; compound eyes black; head slightly wider than pronotum; pronotum brown, with obscure markings; legs brown. Wing membranes subhyaline, veins brown. Abdominal segments including terminalia dark brown.
Tergum 9 sclerotized, with a semicircular mid-posterior incision covering one fifth width of the tergum, two groups of short spines and long hairs present on either side of the incision (Figs. 2a, 3d). Slender vesicle of sternum 9 claviform, length barely 4X maximum width, slightly constricted basally and subapically (Figs. 2b, 3e). Hypoproct subquadrate, gradually narrowing at midlength toward tubular tip (Figs. 2b, 3e). Tergum 10 sclerotized, bearing groups of small and medium-sized spines on either side of a membranous concavity below the epiproct (Figs. 2a, 3d). Cercus slightly sclerotized, about twice as long as maximum width. Epiproct divided into a slender median process and a pair of darkly sclerotized lateral processes, the median process much longer than lateral processes (Figs. 2a, c–e, 3d, f). Dorsal sclerite with basal half nearly rectangular, mostly membranous with thin sclerotized lateral margins (Figs. 2a, d–e, 3d); lateral processes apically slightly curved laterally and ventrally, without apical denticles (Figs. 2a, c–e, 3d, f). Ventral sclerite lightly pigmented but sclerotized, probe-like and tapering towards tip (Figs. 2a, d–e, 3d); basal half expanding into a triangular ventral ridge with a row of tiny black spinules (Fig. 2e); apical half bent downwards in lateral view (Fig. 2e). Paraproct inner lobe slightly sclerotized, short and triangular, partly hidden by hypoproct (Figs. 2b, 3e); median lobe strongly sclerotized medially, curved dorsally for entire length, generally tubular, apex enlarged and armed with 77–78 long spines (Figs. 2a–c, 3d–f); outer lobe shorter median lobe, distinctly sclerotized and plate like, without spines (Fig. 2b).
Female. Body length 5.8 mm. Forewing length 8.0 mm, hind wing length 7.0 mm (n=1). One of the females is not fully sclerotized. Sternum 7 (Fig. 2f) produced in a wide but short pregenital plate, its apex is nearly truncate. Sternum 8 (Fig. 2f) with strongly bilobed subgenital plate; anterior portion with deep and narrow indentation; the posterolateral lobes elongated with nearly straight inner margins, length ca. 1.5X width, the concavity between the lobes subquadrate. Paragenital plate indistinct due to low degree of sclerotization. Sternum 9 fully sclerotized.
Nymph. Unknown.
Type material. Holotype male (HIST), CHINA: Yunnan Province, Zhaotong City, Yanjin County, Miaoba Town, Xiaocaoba scenic spot, 1669 m, N 27.8344°, E 104.2921°, 3-IV-2021, leg. Yingying Wang. Paratypes: 2 females (HIST), same data as the holotype.
Etymology. The specific name refers to the numerous setae of median lobe of the paraproct, which is unique in the sinensis group.
Distribution. China (Yunnan).
Remarks. The new species is a member of A. sinensis group due to the male epiproct possessing a pair of lateral processes and a median process. In this group, A. setosa sp. nov. is most close to A. chui (Wu, 1935) due to a similar male epiproct and female subgenital plate, but can be easily distinguished on the basis of the median lobe of the paraproct being armed with numerous apical spines (compare Figs. 2a–c and 3d–f with figs. 3c and 4 in Zhao & Du 2021b). The epiproct of the new species is also similar to that of A. licenti (Wu, 1938) from Gansu Province. However, the outer lobe of the paraproct in A. licenti is upcurved and hook-like (figs. 228–229 in Wu 1938), whereas the outer paraproct lobe of the new species is plate like and not upcurved (Fig. 2b).
The female subgenital plate of A. setosa is also quite similar to that of A. retusilobata Mo, Wang, Yang, Li & Murányi, 2020 from southern China. In A. setosa, the posterolateral lobes of the subgenital plate are much elongated (length ca. 1.5X width) and the concavity between the lobes is nearly quadrate, whereas the posterolateral lobes in A. retusilobata roughly resemble an equilateral triangle and the hollow between the lobes appears as an isosceles trapezoid (fig. 4 in Mo et al. 2020b).
description: Published as part of Li, Mengyu, Yang, Ding & Li, Weihai, 2023, Two new species of Amphinemura (Plecoptera: Nemouridae) from Yunnan Province, southwestern China, pp. 591-597 in Zootaxa 5231 (5) on pages 593-596, DOI: 10.11646/zootaxa.5231.5.8, http://zenodo.org/record/7609756