Acroneuria henana, Liu & Mo & Li, 2019

Liu, Ruijun, Mo, Raorao & Li, Weihai, 2019, A new species of Acroneuria (Plecoptera: Perlidae) from Henan Province, China, with redescription of A. hainana Wu, 1938, Zootaxa 4619 (2), pp. 371-381 : 372

Acroneuria henana sp. nov.

( Figs. 1–5 )

Adult habitus ( Figs. 1 a–1b). Large sized species, general color dark brown. Head distinctly patterned, ocellar triangle with distinct black marking, M-shaped anterolateral extensions between yellowish M-line and tentorial callosities. Frons forward of M-line dark brown. Occipital area yellowish, medially with a pair of sloping brown bars extending along posterolateral areas of tentorial callosities and posterior ocelli. Antennal scape and pedicel dark brown, flagellum brown. Maxillary palpi brown and labial palpi black. Compound eyes black. Triocellate, anterior ocellus smaller. The distance between the two posterior ocelli as wide as that between ocelli and inner margin of compound eyes. Head wider than pronotum. Pronotum subquadrate, disc dark brown, with prominent rugosities. Legs dark brown except femorotibial joint darker. Wings membrane brownish, veins brown.

Male ( Figs. 1c , 2 ). Length of body 28.3–31.2 mm. Forewing length 23.2–27.3 mm. Hindwing 20.8–23.4 mm. Abdominal segments 1–8 unmodified. Sternum 9 with a large smooth oval hammer anterior to the typical sclerotized posterior edge. Tergum 9 with two close triangular patches of sensilla basiconica. Tergum 10 with larger patches of sensilla basiconica, located laterally to longitudinal median bald area. Paraproct hooked and bent upward and backward, in lateral and caudal views rod-like, tip with an acute ventral spine.

Aedeagus ( Fig. 3 ). Mostly membranous, globular in shape, everted sac tubular with longitudinal and transverse wrinkles, with a slender apex bag-like nearly as long as wide of tubular structure; sclerotized areas covered with spinules present subapically and dorsally interrupted.

Female ( Figs. 4 a–4c). Length of body 33.2 mm. Forewing length 28.8 mm, hindwing length 25.1 mm. Generally similar to males. Subgenital plate large and subquadrate, posterolateral corners rounded, with triangular posteromedian notch, posterior margin extending and overlapping anterior 1/3 of sternum 9. Genital opening nearly as wide as the subgenital plate.

Vagina elongate ( Figs. 4 c–4f), about 4X as long as wide, mostly membranous, dorsally, apex with median depression and lateral ridges, in apical view with W-shaped wrinkles.

Egg ( Fig. 5 ). 439–471 μm long and 305–323 μm wide (N=3). Conical with a slight constriction near anterior end. Cross section round. Collar probably vestigial, covered by simple anchor. Chorion dark brown, collar end smooth but the remaining ⅔ with FCIs and punctations. 3–6 sessile micropyles occur near anterior end, sometimes in irregular row and intervals.

Type material. Holotype male ( HIST), China: Henan Province, Luanchuan County, Longyuwan National Forest Park, 33.7081 N, 111.7550 E, 992 m, 2016. VI.14, W. H. Li . Paratypes: 2 males ( HIST), same data as holotype ; 3 males and 1 female ( HIST) , 1 male ( HNHM), Longyuwan National Forest Park , 1000 m, 2016.V, leg. unknown .

Etymology. The new species is named after the type locality, Henan Province of China.

Distribution. China (Henan Province).

Remarks. The new species is most similar to A. multiconata from Shaanxi Province of northwestern China and A. morsei from Sichuan Province of southwestern China. The adult of A. henana can be distinguished by the distinct M-shaped head pattern. The description by Du (2000) of A. morsei indicated a “mask-like” head pattern. Acroneuria multiconata has pale occipital area, whereas in A. henana the occipital area has a pair of sloping brown bars. The patch of sensilla basiconica of tergum 9 in new species is triangular and that area in A. multiconata transversely subquadate. The female subgenital plate of A. multiconata has a shallow triangular posteromedial notch, whereas in A. henana notch is wider and deeper.

Figures

FIGURE 1. Acroneuria henana sp. nov. (male). a. Habitus, dorsal view. b. Head and pronotum, dorsal view. c. Terminalia and half everted aedeagus, dorsal view.

FIGURE 2. Acroneuria henana sp. nov. (male). a. Terminalia, dorsal view. b. Terminalia, ventral view. c. Terminalia and half everted aedeagus, lateral view. d. Paraprocts and half everted aedeagus, caudal view. e. Paraprocts, dorsolateral view.

FIGURE 3. Acroneuria henana sp. nov. (male). a. Aedeagus, dorsal view. b. Aedeagus, ventral view. c. Aedeagus, lateral view. d. Apex of aedeagal sac, lateral view.

FIGURE 4. Acroneuria henana sp. nov. (female). a. Head and pronotum, dorsal view. b. Terminalia, ventral view. c. Subgenital plate and vagina by transparency, ventral view. d. Vagina, dorsal view. e. Apex of vagina, close up, dorsal view. f. Apex of vagina, anterior view.

FIGURE 5. Acroneuria henana sp. nov. (Eggs). a. Entire egg, lateral view. b. Anterior end, apical view. c. Collar end, oblique apical view. d. Collar end and anchor, lateral view. e. Anterior end, lateral view. f. Micropyle (arrow).