Amphinemura jiaoheensis, Chen, 2020

Chen, Zhi-Teng, 2020, Two new species of Nemouridae (Insecta: Plecoptera) from China, European Journal of Taxonomy 651, pp. 1-16 : 9-13

Amphinemura jiaoheensis sp. nov.

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Figs 8–11 , 13

Diagnosis

Amphinemura jiaoheensis sp. nov. exhibits the typical body color and genitalic characters of genus Amphinemura ( Figs 8–11 ). The new species is apparently distinctive from all congeners by the following combination of characters: 1) male T9 with paired posterior projections which are covered by thick spines; 2) male T10 with two long bunches of stout spines; 3) ventral sclerite of epiproct long, triangular and ventrally fringed with thick spines; 4) median lobe and outer lobe of male paraprocts embracing a membrane, margin of the membrane with long spines; 5) female with a small pregenital plate and a medially divided subgenital plate. The deep posterior notch of tergum 9 together with the long bunches of stout spines on tergum 10 are rarely found in Amphinemura ( Figs 9A , 10A ). Although a similar notch and spines are also found in Amphinemura leigong Wang & Du, 2006 from Guizhou Province of southwestern China, the structures of the epiproct and paraprocts are entirely different between A. leigong and the new species ( Fig. 12 ).

Etymology

The new species is named after the type locality, Jiaohe City.

Material examined

Holotype

CHINA • ♂; Jilin Province, Jiaohe City, Sidaogou Mountain , a small unnamed stream ( Fig. 13 ); 43°44′40′′ N, 127°03′05′′ E; 600 m a.s.l; 22 July 2019; Zhi-Teng Chen leg.; ICJUST.

Paratypes

CHINA • 1 ♂, 2 ♀♀; same collection data as for holotype; ICJUST.

Description

Male

MEASUREMENTS. Holotype: BL = 6.0 mm; FL = 7.0 mm; HL = 6.0 mm. Other specimen: BL = 3.8 mm; FL = 6.0 mm; HL = 5.0 mm.

HEAD ( Fig. 8 A–B). Dark; three ocelli pale; compound eyes dark and rounded; antennae slender and dark brown, much longer than body length; mouthparts brown.

THORAX ( Fig. 8 A–B). Dark brown. Pronotum dark brown, with dark rugosities, corners blunt; anterior margin arcuate, posterior margin concave. Legs pale brown.

WINGS ( Fig. 8 A–B). Macropterous, wing membrane subhyaline, veins dark brown; margins of wings fringed with short bristles.

ABDOMEN ( Figs 8–9 , 10A ). Abdominal segments generally pale brown; anterior margins of abdominal terga 3‒8 each with two dark lateral sclerites; sterna 3‒8 each with two dark lateral sclerites. Tergum 9 strongly sclerotized, anterior margin concave, posterior half elevated and with a transverse patch of stout spines. Tergum 10 darkly sclerotized, with a membranous median area, each side of median area with a knob bearing stout spines. Cerci dark brown, coniform and covered by long hairs.

GENITALIA ( Figs 8 C‒E, 9‒10). Dorsal aspect of epiproct covered with spinulose membrane, medially grooved, apex with a pair of small lobes; apical and ventral membrane of epiproct mostly covered with scales. Dorsal sclerite of epiproct with two slender, lateral sclerites projecting to near apex; inside the membrane with a median sclerite; lateral knobs strongly sclerotized, elliptical in dorsal view. Ventral sclerite strongly sclerotized; in lateral view, ventral sclerite constricted basally, mostly forming a subtriangular sclerite fringed with stout spines, apically with more spines. Vesicle of sternum 9 mostly membranous, claviform and slightly constricted basally; hypoproct elongated, apex extended backwards, with a long finger-shaped sclerite. Paraprocts trilobed; inner lobe sclerotized, fusiform with a blunt tip, nearly as long as width of paraprocts; median lobe strongly sclerotized, broad basally, strongly curved dorsad, apex with long spines; outer lobe strongly sclerotized and curved dorsad, sinuous in lateral view; a layer of membrane present between outer lobe and inner lobe, membrane with a caudal patch of long spines and several longer dorsal spines.

Female

Similar to males in body coloration ( Fig. 11 A‒B).

MEASUREMENTS. BL = 4.8‒5.0 mm; FL = 7.0‒ 7.5 mm; HL = 6.0‒ 6.2 mm.

GENITALIA ( Fig. 11C ). Pregenital plate of sternum 7 small and semicircular. Subgenital plate of sternum 8 subquadrate, with a narrow median split, slightly extending over posterior margin of sternum 8. Paraprocts semicircular and dark brown.

Distribution

China: central Jilin Province ( Fig. 1 ).

Figures

Fig. 8. Amphinemura jiaoheensis sp. nov. A. Male habitus, dorsal view. B. Male habitus, ventral view. C. Male terminalia before NaOH treatment, dorsal view. D. Male terminalia before NaOH treatment, ventral view. E. Male terminalia before NaOH treatment, lateral view.

Fig. 9. Amphinemura jiaoheensis sp. nov. A. Male terminalia after NaOH treatment, dorsal view. B. Male terminalia after NaOH treatment, ventral view. C. Male terminalia after NaOH treatment, lateral view.

Fig. 10. Amphinemura jiaoheensis sp. nov. A. Male tergum 10 and epiproct, lateral view. B. Male epiproct, dorsal view. C. Male paraproct, dorsal view. D. Male paraproct, dorsolateral view. E. Male paraproct, ventral view.

Fig. 11. Amphinemura jiaoheensis sp. nov. A. Female habitus, dorsal view. B. Female habitus, ventral view. C. Female terminalia, ventral view.

Fig. 13. Habitat of Amphinemura jiaoheensis sp. nov. in China, Jilin Province. A. The unnamed stream. B. Adult habitus when captured by a sweeping net.

Fig. 12. Drawings of Amphinemura leigong Wang & Du, 2006. A. Male terminalia, dorsal view. B. Male terminalia, ventral view. C. Male epiproct, lateral view. D. Male paraproct, ventral view. Drawings modified from Yang et al. (2015). Scale bars unavailable from original source.

Fig. 1. Collecting localities of Nemoura lixiana sp. nov. (red spot) and Amphinemura jiaoheensis sp. nov. (pink spot) in China. General distribution of Nemoura geei Wu, 1929 is marked with blue spots or blue text.