Amphinemura cordiformis Li & Yang, 2006

Meng-Yuan, Zhao & Yu-Zhou, Du, 2021, A new species of Nemoura (Plecoptera, Nemouridae) and supplementary description of Amphinemura cordiformis from the Nanling Mountains of southern China, ZooKeys 1039, pp. 109-122 : 109

Amphinemura cordiformis Li & Yang, 2006 Figures 8 , 9 , 10 , 11 , 12

Amphinemura cordiformis : Li & Yang, 2006. Zootaxa 1154: 42.

Amphinemura cordiformis : Wang, Du, Sivec & Li, 2006. Illiesia 2(7): 50.

Amphinemura cordiformis : Yang, Li & Zhu, 2015. Fauna Sinica Insecta 58: 182.

Amphinemura cordiformis : Yang & Li, 2018. Species Catalogue of China. Vol. 2. Animals, Insecta (III), Plecoptera , 8.

Type locality.

China, Guizhou Province, Dashahe.

Material examined.

2♂♂, China, Hunan Province, Chenzhou City, Yizhang County, Mangshan National Natural Reserve , Guizizhai (Fig. 12 ), 1218 m, 24°57'4.896"N 112°55'44.418"E, 3.IX.2020, leg. Huo Qing-Bo (ICYZU) ; 12♂♂, China, Guizhou Province, Leigong Mountain, Lianhuaping , 1450-1620 m, 17-18.IX.2005, leg. Wang Zhi-Jie (ICYZU) .

Distribution.

China (Guizhou, Hunan).

Diagnosis.

Description.

Adult habitus (Fig. 8 ): head and antennae dark brown, palpi pale brown, pronotum dark brown with rugosities, head wider than pronotum; two cervical gills, one on each side of lateral cervical sclerites with two branches, each branch divide into several branches; wing membranes subhyaline, veins brown. Legs pale brown; abdominal segments brown, terminalia darker.

Male (Figs 9 - 11 ). Body length 7.0 mm, forewing length 9.5 mm, hindwing length 7.2 mm. Tergum IX sclerotized with a concavity at mid-anterior margin, an inverted V-shaped concavity at mid-posterior margin (Figs 9B , 11A ). Hypoproct broad basally, bearing setae and tapering to a thin apex, below apex with an apical nipple; vesicle slender, length approximately 4 × of maximum width. Tergum X strongly sclerotized laterally, median area beneath epiproct weakly sclerotized with several black spots ambilaterally, covering sparse long setae (Figs 9 , 11 ). Epiproct slender, split apically with a membranous small ligule; dorsal aspect of epiproct wrapped by two long, oval, apically grooved lobes, jointed at base and divided half-way by distinctly sclerotized along notch, below notch with a pair of V-shaped sclerotized stripes; dorsal sclerite with two slender, lateral sclerites projecting inwards to apex over lobes, forming two teeth-like tips; ventral sclerite entirely sclerotized, constricted basally with two small spines, broadened from half-way forming a subtriangular process with a row of black spines along margin, visible in lateral view; two subtriangular membranous lobes slightly shorter than process, located laterally, surface densely covered with pits (Figs 9 - 11 ). Paraproct trilobed; inner lobe weakly sclerotized, large and square, with slender sclerotized stripe along inner margin; median lobe mostly sclerotized, more strongly at base, subapically curved to form right angle, near apex two rows of small black spines, apex rounded with a ring of claw-like spines; outer lobe shorter than median lobe, weakly sclerotized, apex rounded and more heavily sclerotized, inner edge with some irregular nicks (Figs 10C, D , 11D ).

Remarks.

Compared to the specimens described from Guizhou province, the ones from Hunan province present slight discrepancies in males. The Hunan specimens have a pair of V-shaped sclerotized stripes below the notch in the dorsal view of epiproct, and the ventral sclerite basally bears two small spines, which are obscure in the Guizhou specimens. Additionally, the paraproct outer lobe of the Hunan specimens is thicker, apically rounded, and bears some irregular nicks along the inner edge. The inner lobe has a slender sclerotized stripe along its inner margin and the median lobe bears two rows of spines subapically and a ring of claw-like spines apically whereas the inner lobe is triangular and slightly sclerotized in the Guizhou specimens, and the number and arrangement of the spines near the apex of median lobe are variable. As mentioned above, the enumerated characters probably refer to geographical or individual variability.

Figures

Figure 8. Amphinemura cordiformis male A prothorax, cervical gills, ventral view B head and pronotum, dorsal view.

Figure 9. Amphinemura cordiformis male terminalia A ventral view B dorsal view C lateral view D epiproct, dorsal view.

Figure 10. Amphinemura cordiformis male A epiproct, ventral view B epiproct, lateral view C right paraproct, ventral view D apex of the median right paraproct lobe, ventral view.

Figure 11. Amphinemura cordiformis male A terminalia, dorsal view B terminalia, ventral view C epiproct, lateral view D right paraproct, ventral view.

Figure 12. Habitat of Amphinemura cordiformis in China, Hunan Province, Mangshan National Natural Reserve, Guizizhai (Photograph by Huo Qing-Bo).