Capnia zijinshana

Du, Yu-Zhou & Chen, Zhi-Teng, 2016, A remarkable new species of winter stonefly (Plecoptera: Capniidae) from Southeastern China, Zootaxa 4170 (1), pp. 187-193 : 187-190

publication ID	https://doi.org/ 10.11646/zootaxa.4170.1.12
publication LSID	lsid:zoobank.org:pub:945A4E82-822D-4CDE-B67A-F96B14C93662
DOI	https://doi.org/10.5281/zenodo.6077959
persistent identifier	https://treatment.plazi.org/id/F43F8784-A244-4F5D-77DB-46CBFDC3B2A7
treatment provided by	Plazi
scientific name	Capnia zijinshana
status	sp. nov.

Treatment

Capnia View in CoL s.l. zijinshana Du & Chen , sp. nov.

Figs. 1–14

Male ( Figs. 1–9, 11). Body length 6.0– 6.2 mm. Forewing length 0.3–0.4 mm, hindwing length 0.2–0.3 mm. Body generally dark brown. Head rounded with posterior stigmas and distinct epicranial suture, slightly wider than pronotum; compound eyes black, three ocelli each with dark margins ( Fig. 1). Pronotum quadrangular, corners obtuse. Wings strongly micropterous with obscure venation ( Fig. 8 View FIGURES 8 – 10 ). Ventral sclerites of thorax ( Fig. 7 View FIGURE 7 ): Prothorax: presternum oval, touching the subtriangular basisternum; precoxal bridge rounded, fused with basisternum; furcasternum trapezoidal, fused with both basisternum and the slender, curved postcoxal bridge; postfurcasternum large, elliptical, not fused with furcasternum. Mesothorax: spinasternum narrow, fused medially, not fused with prothoracic postfurcasternum but fused laterally with the large basisternum; presternum large, elliptical, not fused with basisternum; furcasternum triangular, completely fused with basisternum, the furcasternal arms and the furcasternal pit; postfurcasternum divided into two lateral, rounded parts by the furcasternal pit, the parts are not fused with other sclerites; katepisternum entirely fused with basisternum and the ventrally elongated trochantin. Metathorax: presternum elliptical, not fused with the large basisternum; spinasterum vestigial and fused with basisternum; furcasternum elongated and fused with basisternum, laterally slightly projecting backwards but not fused with sternum I; katepisternum entirely fused with basisterum and the ventrally elongated trochantin.

Male abdomen ( Figs. 2–6 View FIGURE 2 – 4 , 11): Abdominal pigmentation dark brown, terga 1–5 with posterior portion pale, terga 2–6 each with shallow indentation and narrow sclerotized band at anterior margins ( Fig. 11). Tergum 9 with a medial, crown-shaped, pale, sclerotized, margined concave area ( Fig. 2 View FIGURE 2 – 4 ). Sternum 9 with an elliptical sclerite, covered by dense hairs; subgenital plate subelliptical in shape, with sclerotized margin and long hairs ( Fig. 4 View FIGURE 2 – 4 ). Tergum 10 divided, medially with a three tongue-shaped basal sclerite ( Fig. 2 View FIGURE 2 – 4 ). Cercus slender with long hairs, 20 segmented and each segment with enlarged distal portion ( Fig. 9 View FIGURES 8 – 10 ). Main epiproct sclerite 0.5mm in length, broad and bifurcate at base, blunt at tip, from base to near tip with a pale fusion line medially, nearly parallel-sided and sword-shaped in dorsal view, not flattened in lateral view ( Figs. 2 View FIGURE 2 – 4 , 5–6).

Female ( Figs. 10 View FIGURES 8 – 10 , 12 View FIGURE 12 ). Body length 6.5–6.7 mm. Forewing length 0.7–0.8 mm, hindwing length 0.4–0.5 mm. Abdominal terga 2–6 with a medial pale stripe, sterna 1–7 each with two small spots ( Fig. 12 View FIGURE 12 ). Subgenital plate reduced, only forming a small median sclerite on posterior of sternum 8 ( Fig. 10 View FIGURES 8 – 10 ).

Type material. Holotype male, China: Jiangsu Province, Nanjing, Mt. Zijinshan , 11851.31′ E, 323.36′ N, 46m, 2 February, 2016, Leg. Zhi-Teng Chen, Zhi-Jie Wang . Paratypes: 24 males and 5 females, same locality and data as holotype .

Etymology. The species is named after the type locality, Mt. Zijinshan, Nanjing, Jiangsu Province of southeastern, China.

Diagnosis. This species is characterized by wings strongly micropterous; tergum 9 with a medial, crownshaped, pale concave area; sternum 9 with elliptical vesicle; main epiproct sclerite broad and bifurcate at base, blunt at tip, apical with a pale medial fusion line, nearly parallel-sided and sword-shaped in dorsal view.

Remarks. Tergal and sternal characters, and general structure of the main epiproct sclerite of the new species appear similar to S. kuankuoshui Murányi, Li & Yang, 2015 . However, the complex eversible crest of S. kuankuoshui does not occur in C. zijinshana (see figs. 4–6 in Murányi et al. 2015). The fusion of mesothoracic Fs with Bs, Fsa and Fsp, and the connection between Bs and Kes, both indicate that the new species does not fit the concept of the genus Sinocapnia ( Murányi et al. 2015) . We tentatively include C. zijinshana as a member of Capnia s.l. Final placement of the new species will be resolved after a revision of the genus Capnia s.l. and related genera by a colleague.

Species of Capniidae reported previously from China are primarily distributed in higher mountains of the Palaearctic Region of the country, whereas C. zijinshana was collected from a clear, slow-moving stream on Mt. Zijinshan at 46 m ( Figs. 13–14 View FIGURE 13 View FIGURE 14 ). This area lies in the transitional zone between the Palaearctic and Oriental regions as recognized for China ( Yang 1937, Zhang 1999). Additional collecting of winter stoneflies in China will certainly reveal additional taxa of interest.