Neoperla jiangsuensis Chen & Du

Chen, Zhi-Teng & Du, Yu-Zhou, 2015, The first record of a species of Perlidae from Jiangsu Province, China: a new species of Neoperla (Plecoptera: Perlidae), Zootaxa 3974 (3), pp. 424-430 : 424-427

Neoperla jiangsuensis Chen & Du , sp. nov.

( Figs. 1–9 )

Adult habitus. General color light yellow patterned with light brown. Head mostly pale yellow except for dark brown area covering ocelli and a trapezoidal patch on anterior portion of frons; compound eyes dark, antennae dark brown ( Figs. 1, 2 ). Pronotum disc pale brown with medial portion brown ( Figs. 1, 2 ). Wing membrane subhyaline, veins brown. Coxae and femur pale, tibiae and tarsi brown. Abdomen brown, hemiterga darker brown. Cerci dark Male. Forewing length 11.0–11.5 mm, hindwing length 10.0–10.5 mm. Terga 1–8 with brown lateral stripes. The posterior margin of tergum 7 with upraised process, covered with dense sensilla basiconica. Tergum 8 with a recurved oval process bearing small spines at distal margin ( Figs. 3–4 , 5). Tergum 9 without sensilla basiconica. Hemitergal processes of tergum 10 slightly curved ( Figs. 3, 4 ). Aedeagal tube plump and slightly sclerotized, apically with a patch of small spines. Aedeagal sac slightly longer than tube and curved ventrally; subapically with two curving C-shaped rows of large stout spines laterally; apically forming a double ear-shaped membranous structure. ( Figs. 6–7, 8).

Female. Forewing length 11.5–12.0 mm, hindwing length 10.0–10.5 mm. Subgenital plate small, with a small median sclerotized area; sternum 9 with two lateroventral brown spots ( Fig. 9).

Type material. Holotype: male, China: Jiangsu Province, Xuyi, Tieshan Temple, 32.4404 N, 118.2807 E, 2014. VI.1, Chen Zhi-Teng & Wang Zhen. Paratypes: 68 males and 9 females, same data as holotype.

Etymology. The species is named after the type locality, Jiangsu Province.

Diagnosis. The new species can be distinguished by the aedeagal sac with two C-shaped rows of large stout spines laterally and double ear-shaped membranous lobes apically. Additionally, the aedeagal tube has a patch of small spines apically.

Remarks. The new species is a member of the N. montivaga group ( Kong et al 2014). The aedeagal tube and sac of the new species is similar to that of N. maolanensis Yang & Yang, 1993 , however in that species, the aedeagal tube is less sclerotized dorsally (see Fig. 2 in Yang & Yang 1993). In addition, the aedeagal sac of N. maolanensis lacks the double ear-shaped apical membranous lobes characteristic of the new species. Both species bear similar large spines near the sac apex, but in N. jiangsuensis the number of large spines are fewer and the spines along the sac are dorsolateral.

Figures

FIGURES 1 – 2. Neoperla jiangsuensis sp. nov. Head and pronotum, dorsal view.

FIGURES 3 – 4. Neoperla jiangsuensis sp. nov. Male terminalia, dorsal view.