Nemoura fusiformis Chen & Du

Chen, Zhi-Teng & Du, Yu-Zhou, 2017, A new species of Nemoura (Plecoptera: Nemouridae) from Jiangsu Province, China, with new illustrations for Nemoura nankinensis Wu, Zootaxa 4254 (2), pp. 294-300 : 294-297

Nemoura fusiformis Chen & Du , sp. nov.

Figs. 1–10 .

Adult habitus. Head brown with brownish area between ocelli, compound eyes dark, antennae and mouthparts brown. Thorax brown, pronotum nearly rectangular, posterior margin concave, surface with brown rugosities, corners obtuse ( Figs. 1, 10 ); legs brownish. Wings subhyaline, veins dark brown. Abdomen brown with hairs mostly pale ( Fig. 10 ).

Male. Body length 5.0– 5.5 mm. Forewing length 7.0– 7.5 mm, hindwing length 6.0– 6.5 mm. Tergum 8 slightly concaved anteromedially. Tergum 9 with broad anterior indentation, a row of long bristles located medially. Tergum 10 weakly sclerotized with several spines anteromedially, a medial concavity located anterior to base of epiproct ( Figs. 2–3 ). Cercus prolonged and upcurved, inner part membranous and covered with hairs, apex rounded; outer margin of cercus sclerotized, the outer sclerite broad basally, gradually tapering to a slightly pointed tip, with a sub-triangular, sclerotized medial process from lateral view ( Fig. 5 ). Epiproct fusiform; dorsal sclerite with a pair of lateral sclerites on apical half, and with crossed grooves medially; ventral sclerite spinulose, with a pair of prongs at lateral sides in the apicomesal projection ( Fig. 7 ); lateral knob weakly sclerotized and covered with spinules ( Figs. 2–4, 6 ). Vesicle of sternum 9 claviform and slightly constricted basally; hypoproct broad and rounded, covered with long hairs ( Fig. 8 ). Paraproct bilobed: inner lobe weakly sclerotized, stripe-shaped with a blunt tip, nearly as long as outer lobe; outer lobe slightly sclerotized, broad basally, outer margin forming a strongly sclerotized large hook and neighboring a sharp process ( Figs. 8–9 ).

Female. Unknown.

Type material. Holotype: male, China: Jiangsu Province, Suzhou, Mt. Qionglongshan , 36m, 31.1615 N, 120.2595 E, 29 March, 2016, leg. Zhi-Teng Chen, Qing-Bo Huo (Insect Collection of Yangzhou University, Yangzhou, Jiangsu Province, China) . Paratypes: 4 males, same data as holotype ; 6 males, Mt. Qionglongshan , 36m, 31.1615 N, 120.2595 E, 23 February, 2016, leg. Zhi-Teng Chen, Qing-Bo Huo.

Etymology. The Latin name of the species refers to the fusiform shape of the epiproct.

Diagnosis. The new species is characterized by the strongly sclerotized large hook formed by outer margin of paraproct outer lobe, and by the outer sclerite of cercus with a sub-triangular medial process. The male of N. fusiformis seems similar to N. taihangshana Wang, Li & Yang, 2013 in the shape of the epiproct and cerci, but is distinguished by the shape of the paraprocts and outer sclerite of the cercus. According to the prong structure of the epiproct, both of these species belong to a species group that includes N. ovocercia Kawai, 1960 ( Shimizu 1997) . However, in the new species, the paraproct inner lobe is much longer than that in N. taihangshana ; the paraproct outer lobe has no tubular process as occurs in N. taihangshana (see fig. 15 in Li & Yang 2013). In addition, the new species has a sub-triangular medial process on outer sclerite of cercus from lateral aspect. However, N. taihangshana has a large apical cercal spine instead of a sub-triangular process (see figs. 1, 9 in Li & Yang 2013).

Figures

FIGURES 1 – 10. Nemoura fusiformis, sp. nov. 1. Male head and pronotum, dorsal view; 2 – 3. Male terminalia, dorsal view; 4. Male terminalia, lateral view; 5. Left cercus, lateral view; 6. Epiproct, lateral view; 7. Epiproct, ventral view; 8. Male terminalia, ventral view; 9. Paraproct, caudal view.