Amphinemura similibimaculata Yan & Wang & Yang & Li 2021, sp. nov.
Creators: name: Yan, Yanhua
name: Wang, Ying
name: Yang, Ding
name: Li, Weihai
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Plecoptera
Nemouridae
Amphinemura
Amphinemura similibimaculata

description: Amphinemura similibimaculata sp. nov.
(Figs. 1–3)
Adult habitus (Fig. 1). General body color pale with dark brown pigmentation mesally on thoracic nota (Fig. 1a). Head (Fig. 1b) dark brown with elliptical light area between posterior ocelli, a small light brown patch lateral to each posterior ocellus. Antennal segments brown and longer than body length. Pronotum with a pair of large worm-like dark brown areas between pale lateral margins; the pale margins across one fourth width of the disc, and pale medline sandglass shaped (Fig. 1a). Wings brownish with darker veins. Legs brownish. Abdominal terga pale brown, terminalia dark brown (Fig. 1c).
Male. Forewing length ca. 5.8–6.1 mm, hindwing length ca. 4.5–4.9 mm (N=3). Tergum IX sclerotized, anterior margin and constricted median portion heavily sclerotized; posterior margin with a medially interrupted row of ca. 6–8 long paramedial bristles (Figs. 2a, 3a). Vesicle of sternum IX slender, at least 4X longer than widest portion, slightly constricted medially (Figs. 2b, 3b). Hypoproct subrectangular basally, gradually narrowing toward apical third where the tubular tip is abruptly narrowed (Figs. 2b, 3b). Tergum X sclerotized, two clusters of spinules present anterolateral of longitudinal concavity beneath epiproct and posterolateral margin of tergum X. Cercus short, ca. 2X as long as wide, and slightly sclerotized. Epiproct subrectangular with a large anteromedial notch (Figs. 2a, 3a); dorsal sclerite with slender, lateral dark arms convergent apically, but nearly parallel-sided after KOH treatment; the lateral arms bifurcate medially in lateral view (Fig. 3c); ventral sclerite with a rounded bulging subapical ridge, ventrally fringed with black spines; apex extending over the dorsal sclerite forming a tube-like flagellum (Figs. 2c–2d, 3a, 3c–3d). Paraproct (Figs. 2f– 2g, 3b–3c) outer lobe in ventral view laterally sclerotized, medially membranous, upcurved at middle (Figs. 2b, 3c) with 2–3 straight, long spines medially and distally with 2 longer, close-set spines (Figs. 2a, 2f– 2g, 3a, 3c); median lobe well sclerotized, strongly upcurved at midlength to form a long, heavily sclerotized lobe bearing 4–5 short black spines and an acute, hooked apex (Figs. 2c, 2g, 3a, 3c); inner lobe forming a poorly sclerotized, simple triangular sclerite.
Female. Unknown.
Type material. Holotype male (HIST), Vietnam, Thua Thien-Hue, Bachma National Park, 400 m, 2012.V.4, N 16°11.694’, E 107°51.438’, leg. Weihai Li. Paratypes: 2 males (CAU & HIST), same date and site, leg. Xingyue Liu.
Etymology. The specific name refers to the similarity with A. bimaculata, a species recently described from Yunnan Province of China.
Distribution. Central Vietnam (Thua Thien-Hue Province).
Diagnosis and remarks. The paired pronotal markings of the new species is very similar to that of A. bimaculata. The new species is distinguished by its epiproct in dorsal view having a long, tubular extension of the ventral sclerite (Figs. 3a, 3c, 3d). In A. bimaculata a quadrate tab is formed instead (Fig. 4c). Additionally, the new species has long, curved apical spines of paraproct outer lobe while there is only a short cluster of apical spines on the outer lobe in A. bimaculata. The outer lobe in the new species has 2–3 long medial spines which are absent in A. bimaculata.
description: Published as part of Yan, Yanhua, Wang, Ying, Yang, Ding & Li, Weihai, 2021, A new species of Amphinemura (Plecoptera: Nemouridae) from Vietnam, with additions to A. bimaculata Li, Wang and Yang, 2016, pp. 583-588 in Zootaxa 4980 (3) on pages 583-588, DOI: 10.11646/zootaxa.4980.3.9, http://zenodo.org/record/4897329