Perlodinella shennongjia Chen, Xu & Shen, 2022

Chen, Zhi-Teng, Xu, Yi-Yang & Shen, Zi-Hao, 2022, Perlodinella shennongjia sp. nov., a new species of Perlodinella Klapalek (Plecoptera, Perlodidae) from the central area of China, Biodiversity Data Journal 10, pp. 87247-87247 : 87247

Perlodinella shennongjia Chen, Xu & Shen, 2022 sp. n.

Materials

Type status: Holotype. Occurrence: individualCount: 1; sex: male; Taxon: kingdom: Animalia ; phylum: Arthropoda ; class: Insecta ; order: Plecoptera ; family: Perlodidae ; genus: Filchneria ; specificEpithet: shennongjia; taxonRank: species; nomenclaturalCode: ICZN; Location : country: China; stateProvince: Hubei; municipality: Shennongjia Forestry District ; locality: Dajiuhu National Wetland Park ; verbatimElevation: 1551 m; verbatimCoordinates: 110°7′33.9″N, 31°27′5″E; Identification : identifiedBy: Zhi-Teng Chen ; Event : verbatimEventDate: 31-03-2022; Record Level: institutionCode: ICJUST Type status: Paratype. Occurrence: individualCount: 11; sex: 7 males, 4 females; Taxon: kingdom: Animalia ; phylum: Arthropoda ; class: Insecta ; order: Plecoptera ; family: Perlodidae ; genus: Filchneria ; specificEpithet: shennongjia; taxonRank: species; nomenclaturalCode: ICZN; Location : country: China; stateProvince: Hubei; municipality: Shennongjia Forestry District ; locality: Dajiuhu National Wetland Park ; verbatimElevation: 1551 m; verbatimCoordinates: 110°7′33.9″N, 31°27′5″E; Identification : identifiedBy: Zhi-Teng Chen ; Event : verbatimEventDate: 31-03-2022; Record Level: institutionCode: ICJUST

Description

Male

Body length (from anterior of head to posterior of paraprocts) 13.0-15.0 mm (examined specimen number = 8), living male near habitat stream and male in ethanol both dark brown (Figs 1 , 2 ).

Head mostly dark brown dorsally, pale ventrally (Fig. 2 ); triocellate, anterior ocellus much smaller than posterior ocelli, ocellar area and posterior margin of head pale. Compound eyes dark and rounded. Antenna slender, length slightly longer than abdomen, all segments dark brown.

Pronotum subquadrate (Fig. 2 ), lateral margins nearly parallel, pigmentation dark brown, except pale median stripe, surface with several obscure rugosities. Prosternum mostly pale, medially with a fusiform, dark spot. Mesothoracic furcasternum branches reaching posterior of furcal pits. Basisterna and furcasterna of meso- and metathorax dark brown. Wings fully developed or slightly shortened (Figs 1 , 2 , 3 ), fore-wings length 10.0-12.0 mm (examined specimen number = 8), hind-wings length 8.0-10.0 mm (examined specimen number = 8); wing membrane subhyaline, veins brown. In fore-wings, apex with small net-like venation formed by apical branches of RA and RP; six to seven cross-veins present between C and Sc; anal area with four main anal veins. In hind-wings, apical net similar to that of fore-wing; anal area large and folded, with about ten anal branches. Leg background dark brown (Fig. 2 ); coxae, trochanters and joints between femora and tibiae pale; two giant tibial spurs present apically; claws slender and sharp.

Abdominal segments mostly dark (Figs 2 , 4 , 5 ), segments 1-4 divided into distinct terga and sterna by pale lateral membrane, pale lateral areas extending to sterna 5-6 in a paratype. Sternum 1 completely fused with metathorax. Sternum 9 elongated, mostly or entirely dark brown. Terga 6-9 not elevated at posterior half, with dense posterolateral hair patches. Posterior half of terga 8-10 with scattered sensilla basiconica. Tergum 10 strongly elevated, dorsally covered with dense short spines and sparse sensilla basiconica (Figs 4 , 5 ); apex blunt, ventrally with scattered sensilla basiconica. Epiproct completely membranous (Fig. 5 ), thumb-shaped, basal half cylindrical, slightly constricted near mid-point, apical half rounded; dorsal surface covered with sparse patch of conical, dark spines, ventral surface covered with dense patch of conical, dark spines, apex scattered with sparse, conical, pale spines. Paraproct sclerite wide and resembling a parallelogram basally (Fig. 5 ), then gradually tapering into an inwardly pointed apex; anterior margins of paraproct sclerites dark; inner margins dark, not connected basally, nearly parallel at basal half, apical half of paraproct sclerites surrounding a circular median area. Paraproct lobe short, near bulbous, covered with dense, conical, pale spines and with several scattered, conical, dark spines. Cerci subequal in length to abdomen; each segment mostly dark brown, except paler basal ends, with a whorl of long bristles around distal end.

Female

Body length 17.0-19.0 mm (examined specimen number = 4), mostly dark brown (Fig. 6 ). Colour pattern similar to males.

Macropterous (Figs 6 , 7 ); fore-wings length 15.0-16.0 mm, hind-wings length 13.0-14.0 mm (examined specimen number = 4); wing membrane subhyaline, veins brown. Wing venation similar to males.

Abdomen dorsally dark brown; abdominal sterna 1-7 with a continuous dark brown, median stripe, lateral areas pale (Fig. 6 ). Abdominal sternum 8 with four subtriangular dark sclerites, anterior ones smaller, posterior ones larger, median line pale. Subgenital plate broad, posterior margin rounded, nearly reaching posterior margin of sternum 9. Sterna 9-10 pale and short. Paraproct subtriangular, apex blunt, with grey inner and posterior margins.

Egg

Length ca. 800 μm; width ca. 400 μm. Trilateral (Fig. 8 ), with three conspicuous longitudinal ridges. Each side of egg with a transverse ridge near posterior pole. Anterior area of each transverse ridge with one row of several micropyles. Chorion relatively smooth. Anchor completely membranous, mushroom-shaped in lateral view, surface covered with dense granules. Collar sessile and short, with sinuous anterior margins.

Diagnosis

The new species is diagnostic by the following combination of features: mesothoracic furcasternum branches reaching posterior of furcal pits; hind-wings with broad anal area; male abdominal segments 1-4 divided into distinct terga and sterna; terga 6-9 not elevated at posterior half, with dense posterolateral hair patches; terga 8-10 with scattered sensilla basiconica on posterior half; tergum 10 strongly elevated, dorsally covered with dense short spines and sparse sensilla basiconica, apex blunt, ventrally with scattered sensilla basiconica; aedeagus membranous, thumb-shaped, dorsally covered with sparse dark spines, ventrally covered with dense dark spines, apex with sparse pale spines; paraproct sclerite basally resembling a parallelogram, apex inwardly pointed, anterior and inner margins dark, not connected basally; eversible paraproct lobe short, near bulbous, covered with dense pale spines and several scattered dark spines; female abdominal sterna 1-7 with a continuous dark median stripe, sternum 8 with four subtriangular dark sclerites, sterna 9-10 pale and short; subgenital plate broad, elongated and rounded; eggs trilateral, with both longitudinal and transverse ridges, micropyles present.

Perlodinella shennongjia sp. nov. can be easily distinguished from P. kozlovi and P. epiproctalis by the unlobed epiproct ( Zwick 1997, Huo et al. 2022), from P. unimacula , P. microlobata , P. fuliginosa and P. tatunga by the rounded female subgenital plate without any notch or lobes ( Wu 1938a, Wu 1938b, Wu 1973), from P. apicalis by the absence of dark brown femora and downcurved hook on paraproct ( Kimmins 1947), from P. mazehaoi by the distinctly shorter male tergum 10 and different shape of female subgenital plate ( Chen 2019) and from P. tibetensis by the paraproct sclerites pointing inwards instead of outwards ( Huo et al. 2022).

Etymology

The new species is named after its type locality, the Shennongjia Forestry District.

Distribution

The new species is currently only known from the Shennongjia Forestry District, Hubei Province, China.

Figures

Figure 1. Perlodinella shennongjia sp. nov. A Habitat in Dajiuhu National Wetland Park, Shennongjia Forestry District, Hubei Province, China, photo by Yi-Yang Xu; B Living habitus of male, photo by Yi-Yang Xu; C Living habitus of a pair of mating adults, photo by Yi-Yang Xu.

Figure 2. Perlodinella shennongjia sp. nov., male holotype A Habitus, dorsal view; B Habitus, ventral view.

Figure 3. Perlodinella shennongjia sp. nov., male holotype A Right forewing, dorsal view; B Right hind-wing, dorsal view.

Figure 4. Perlodinella shennongjia sp. nov., male holotype A Abdomen, dorsal view; B Abdomen, lateral view; C Abdomen, ventral view.

Figure 5. Perlodinella shennongjia sp. nov., male holotype A Male terminalia, caudal view; B-D Male terminalia, dorsal view; E Apex of aedeagus, dorsal view; F-G Aedeagus, lateral view; H-I Aedeagus, dorsolateral view.

Figure 6. Perlodinella shennongjia sp. nov., female paratype A Female habitus, dorsal view; B Female habitus, ventral view.

Figure 7. Perlodinella shennongjia sp. nov., female paratype A Right fore-wing, dorsal view; B Right hind-wing, dorsal view.

Figure 8. Perlodinella shennongjia sp. nov., immature eggs A Egg with anchor preserved, lateral view; B Less-developed egg, lateral view; C Egg with anchor removed, lateral view.