Furcaperla jiangxiensis Yang & Yang, 1991

Yan, Yanhua, Li, Mengyu & Li, Weihai, 2021, Taxonomic notes on the genus Furcaperla (Plecoptera: Perlidae) from China, Zootaxa 5071 (3), pp. 427-436 : 432-434

Furcaperla jiangxiensis Yang & Yang, 1991

( Figs. 3–7 )

Furcaperla jiangxiensis Yang & Yang, 1991: 16 ; Du et al. 1999: 62; Yang & Li, 2018: 36.

Material examined. Holotype male, 2 male and 6 female paratypes (a female is labeled allotype) ( CAU): China, Jiangxi Province, Guixi County, 1990.VI.5, leg. Lianfang Yang. 1 male ( HIST): China, Fujian Province, Shaowu County, Wuyi Mountains , Nanhu Forest Farm , 409 m, light trap, N 27°32.38’, E 117°29.30’, 2019.VI.11, leg. Raorao Mo & Weihai Li.

Redescription: Adult habitus ( Figs. 3a , 5 , 6a ). General color dark brown. Head yellow and brown, ocellar patch dark brown and anterolaterally extending to M-line, frontoclypeal area blackish. Triocellate, anterior ocellus slightly smaller; ocelli surrounded by black ring. Antennae dark brown, scape and pedicel black. Mouthparts dark brown, palpi light brown. Head slightly wider than pronotum. Pronotum dark brown with distinct rugosities, posterior corners rounded. Legs dark brown, coxae and trochanters yellowish brown. Wing membrane mostly light brown, apical angle brown, veins dark brown (the types lighter). Forewing with nine humeral crossveins between the C and Sc veins, Rs with four branches, and there are 12 m-cu crossveins. Hindwing with four humeral crossvein between the C and Sc veins, R with five branches, M veins with four branches ( Fig. 5 ).

Male ( Figs. 3–4 ). Forewing length 16.0– 18.2 mm, hindwing length 14.5–16.5 mm (N=4). Terga 5–6 unmodified. Tergum 8 mostly sclerotized, lateral area dark brown and strongly sclerotized. Posterior process of tergum 8 rectangular; posterolateral part of the process trapezoid, medially hollowed and covered by dense sensilla basiconica, laterally armed with long hairs. Tergum 9 mostly sclerotized, with a medially depressed hump fully covered by sensilla basiconia. Terga 8–9 with membranous area in lateral sides to the median hump. Hemitergal lobes of tergum 10 dark brown, finger-like, apically bifurcate; upper furcula longer, lower furcula shorter and robust; basal callus rounded. Basal part of cercus black, the rest is darker. Aedeagal tube curved and medially constricted, darkly sclerotized except for membranous distal part and slightly sclerotized basodorsal portion; basal one third with a coniform protuberance; subapical part with finger-like dorsal process; apically with dense and fine, golden spines. Aedeagal sac about one third of the aedeagal tube length; basal half membranous with densely clustered sensillae; medially swollen; mesolaterally with a pair of bulbous projections with strongly sclerotized inner margin; apex hook-like and strongly sclerotized, covered with dense spinules.

Female ( Fig. 6 ). Forewing length 19.8–22.2 mm, hindwing length 18.5–20.2 mm (N=4) The body color of paratypes lighter than the newly collected male due to long preservation in alcohol. Subgenital plate slightly produced, posteromedially with a bigger saddle-shaped sclerotized area and a small triangular notch. Vagina ovalshaped, anterior portion with several dark brown folds; spermathecal stalk short; spermatheca sausage-shaped, with apical gland.

Egg ( Fig. 7 ). Length 337–343 μm, width 253–257 μm (N=3). Several mature eggs were dissected from one of the female paratypes. Outline chicken egg shaped but opercular end drum-like. Chorion brown. Collar with short stalk, apically flanged. Chorionic surface mostly smooth, except for 3-4 irregular rows of pits at opercular end.

Distribution. China (Fujian, Jiangxi).

Remarks. The terminalia of both sexes in F. jiangxiensis is similar to F. bifurcata . However, the aedeagal tube of the F. jiangxiensis has a single finger-like subapical process and is covered by dense long hairs apically. In F. bifurcata , the aedeagal tube has a pair of finger-like subapical processes and is covered by fine spinules at apex. The egg of F. jiangxiensis differs from that of F. bifurcata by the presence of distinct pits at the opercular end. The new specimen from Fujian Province is identical to the holotype and represents the first record for the province.

Figures

FIGURE 3. Furcaperla jiangxiensis Yang & Yang, 1991 (male, Fujian Province). a. Head and pronotum, dorsal view. b. Terminalia and aedeagus, dorsal view. c. Terminalia, oblique lateral view. d. Relaxed terminalia, oblique lateral view.

FIGURE 4. Furcaperla jiangxiensis Yang & Yang, 1991 (male, Fujian province). a. Aedeagus, dorsal view. b. Aedeagus, lateral view. (At = Aedeagal tube; Ac = Aedeagal sac.) c. Aedeagus, oblique caudal view. d. Aedeagus, caudal view.

FIGURE 5. Furcaperla jiangxiensis Yang & Yang, 1991 (male, Fujian Province). a. Forewing. b. Hindwing.

FIGURE 6. Furcaperla jiangxiensis Yang & Yang, 1991 (paratype female, Jiangxi Province). a. Head and pronotum, dorsal view. b. Terminalia, ventral view. c. Vagina, dorsal view. d. Vagina, dorsolateral view.

FIGURE 7. Furcaperla jiangxiensis Yang & Yang, 1991 (eggs from female paratype, Jiangxi Province). a. Egg, lateral view. b. Collar end, lateral view. c. Opercular end, lateral view. d. Pits of opercular end.