Amphinemura changbaishana, Li & Teslenko & Yang, 2020

Li, Weihai, Teslenko, Valentina A. & Yang, Ding, 2020, Two new species and new record of Amphinemura (Plecoptera: Nemouridae) from northern China, Zootaxa 4743 (3), pp. 402-410 : 403-405

Amphinemura changbaishana sp. nov.

( Figs. 1–10 )

Examined material. Holotype male ( CAU), CHINA: Jinlin Province , “scenic spot” on Changbaishan Mountain, 41°35’ E 127°45’, 6.VIII.2015, coll. Z. Kang. Paratype: 1 male ( HIST), same locality and date as holotype .

Description. Adult habitus. General colour dark brown with light pattern. Head black except a heart-shaped brownish area covering the ocellar area; antennae light brown but pedicel and scape brown, compound eyes dark brown; head ( Fig. 5 ) distinctly wider than pronotum; pronotum brown, surface distinctly coarse; legs yellowish brown.

Male ( Figs. 1–4 , 6–10 ). Forewing length ca. 6.5 mm. Tergum 9 sclerotized, the anterior margins more heavily, the posteromedial and anterolateral edges less; mid-posterior margin fringed with two paramedial groups of strong setae ( Fig. 1 ). Vesicle of sternum 9 claviform, apical part swollen ( Figs. 2 & 3 ). Hypoproct trapezoid in the basal half, with an obtuse angle in the middle of the outer edge, narrowed distally and terminates in a short tongue-shaped apex ( Fig. 2 ). Tergum 10 darkly sclerotized, the anteromedian membranous concavity wider than the epiproct above it. Cercus short and conical, slightly longer than wide. Epiproct ( Figs. 1, 3 , 6–7 ): subrectangular with dark anterolateral serate expansions from caudal ends of which extends a pair of black prongs; dorsally sclerite covered with robust sclerotized lateral bands; ventral sclerite strongly sclerotized, well visible by transperency after clearing, contour sinuous and medially slightly enlarged, anterior third with a ventral ridge with 4˗5 stout black spines but in lateral view mostly hidden by the anterolateral prong ( Fig. 3 ). Paraproct trilobed ( Figs. 8–10 ): inner lobe a relatively large sclerotized triangular plate; median and outer lobes slightly longer than inner lobe; both sclerotized and claviform but the outer one more robust, apices convergent and with 3 black spines on the apical membrane ( Figs. 8–10 ).

Female. Unknown.

Remarks. Amphinemura changbaishana is closely related to A. denstigris Zwick, 2010 , A. steinmanni Zwick, 1973 , and A. rai Ham & Lee, 1999 , all originally described from the Korea Peninsula, sharing similar anterolateral epiproct prongs. Among these four species, A. steinmanni and the new species have only three paraproct spines, whereas A. denstigris and A. rai have numerous spines arranged in several rows; but epiproct of A. steinmanni differs greatly from A. changbaishana . By similarity in epiproct structure, A. changbaishana and A. rai , seems to be more closely related but can be easily separated by the paraprocts and also by details of epiproct. The anterolateral prongs of A. rai are located close to the middle line of the epiproct body, whereas the prongs in A. changbaishana are arranged along the lateral epiproct edges, both in dorsal and lateral views ( Figs. 1, 3 ). Additionally, the basal portion of the lateral sclerites of the epiproct is more robust in A. changbaishana than in A. rai . Finally, the head pattern of A. changbaishana is distinctive with a large pale ocellar patch against the dark background which does not occur in the other related taxa mentioned above.

Distribution. China (Jilin Province).

Etymology. The specific name refers to Changbaishan the mountain system.

Figures

FIGURES 1–5. Amphinemura changbaishana sp. nov., male. 1. Terminalia, dorsal view. 2. Terminalia, ventral view. 3. Terminalia, lateral view. 4. Epiproct, dorsal view. 5. Head, dorsal view.

FIGURES 6–10. Amphinemura changbaishana sp. nov., male. 6. Epiproct, dorsal view. 7. Epiproct, lateral view. 8. Paraprocts, caudal view. 9. Right paraproct, dorsal view. 10. Right paraproct, lateral view.