Hahnia jiangkou Gan, Wang & Mi, 2023

Gan, Jiahui, Wang, Cheng & Mi, Xiaoqi, 2023, A new cave-dwelling species of Hahnia C. L. Koch, 1841 from Guizhou Province, China (Araneae, Hahniidae), Biodiversity Data Journal 11, pp. 113400-113400 : 113400

Hahnia jiangkou Gan, Wang & Mi sp. nov.

Materials

Type status: Holotype. Occurrence: sex: male; occurrenceID: 5194CA23-772E-5AF5-85EA-C3890C30CFD3; Location: country: China; stateProvince: Guizhou; county: Jiangkou ; locality: Minxiao Township , Shanyang Cave ; verbatimElevation: 784 m; verbatimLatitude: 27°41′1.6″N; verbatimLongitude: 108°36′48.6″E; Identification: identifiedBy: Jiahui Gan; Event: samplingProtocol: by hand; year: 2023; month: 3; day: 12; habitat: cave Type status: Paratype. Occurrence: individualCount: 2; sex: females; occurrenceID: 9DF11921-5D69-5084-9A5B-33B949512893; Location: country: China ; stateProvince: Guizhou; county: Jiangkou ; locality: Minxiao Township , Shanyang Cave ; verbatimElevation: 784 m; verbatimLatitude: 27°41′1.6″N; verbatimLongitude: 108°36′48.6″E; Identification : identifiedBy: Jiahui Gan ; Event : samplingProtocol: by hand; year: 2023; month: 3; day: 12; habitat: cave Type status: Paratype. Occurrence: individualCount: 4; sex: females; occurrenceID: BD0E595D-996E-53D6-9237-E34DFDF07C87; Location: country: China ; stateProvince: Guizhou; county: Jiangkou ; locality: Minxiao Township , Shanyang Cave ; verbatimElevation: 784 m; verbatimLatitude: 27°41′1.6″N; verbatimLongitude: 108°36′48.6″E; Identification: identifiedBy: Jiahui Gan; Event: samplingProtocol: by hand; year: 2022; month: 4; day: 26; habitat: cave

Description

Male (holotype, Fig. 1 , Fig. 2 C, D, F and G): Total length 2.65. Carapace 1.26 long, 1.03 wide. Abdomen 1.41 long, 1.08 wide. Eye sizes: AME 0.06, ALE 0.08, PME 0.06, PLE 0.08. Distance between eyes: AME-AME 0.08, AME-ALE 0.08, PME-PME 0.14, PME-PLE 0.09, ALE-PLE 0.09. MOA 0.17 long, front width 0.12, back width 0.21. Clypeus 0.15 high. Leg measurements: I 4.22 (1.20, 0.38, 1.03, 0.88, 0.73); II 3.99 (1.18, 0.33, 0.95, 0.85, 0.68); III 3.62 (1.00, 0.33, 0.83, 0.83, 0.63); IV 4.42 (1.20, 0.38, 1.08, 1.03, 0.73). Carapace (Fig. 2 C and F) pale yellow to yellow, with elevated cephalon and almost round, flat thorax bearing brown markings anterior to fovea and irregular, lateromarginal, brown markings; fovea red-brown, longitudinal. Chelicerae (Fig. 2 F and G) yellow, both margins with three teeth. Endites lighter than chelicerae, covered with sparse brown setae. Labium darker than endites. Sternum dark brown, almost heart-shaped, covered with dark setae. Legs pale to yellow. Abdomen (Fig. 2 C and D) sub-oval, dorsum grey pale to dark brown, with a pair of longitudinal, grey pale, anteromedian stripes separated by the longitudinal, dark brown stripe and alternate grey pale and dark brown transverse stripes medioposteriorly; venter pale to dark brown, covered with short thin setae.

Palp (Fig. 1 A and B): patella enlarged, almost as long as wide in retrolateral view; RPA proximally located, curved towards the dorsal side at the base and then tapering to a pointed tip; tibia short, with the sclerotised RTA bifurcated into two rami extending dorsally and with pointed tips; cymbium rather flat, with a retrolateral furrow about five-sixths its length; bulb flat, almost oval; embolus enlarged at base, followed by the remainder of the flagelliform originating at ca. 3:30 o’clock position and extending almost to a circle; conductor membranous, slightly longer than wide, close to the origin of the flagelliform portion of the embolus; MA membranous, sheet-shaped, almost quadrate, located anteriorly to the base of embolus, extending antero-retrolaterally.

Female (paratype, Fig. 2 A, B and E): Total length 2.83. Carapace 1.20 long, 0.98 wide. Abdomen 1.90 long, 1.30 wide. Clypeus 0.14 high. Eye sizes: AME 0.05, ALE 0.09, PME 0.10, PLE 0.10. Distance between eyes: AME-AME 0.08, AME-ALE 0.09, PME-PME 0.16, PME-PLE 0.10, ALE-PLE 0.10. MOA 0.19 long, front width 0.13, back width 0.24. Leg measurements: I 3.87 (1.13, 0.40, 0.93, 0.78, 0.63); II 3.66 (1.10, 0.38, 0.85, 0.73, 0.60); III 3.41 (0.95, 0.35, 0.78, 0.75, 0.58); IV 4.41 (1.18, 0.40, 1.13, 1.00, 0.70). Habitus (Fig. 2 E) similar to that of male, except paler.

Epigyne (Fig. 2 A and B): slightly wider than long; atrium oval, deeply concave, anteromedially located, with an almost straight anterior ridge; copulatory openings fused, located at the posterior portion of atrium; copulatory ducts widened and flat at the base and then acutely narrowed into tube-shaped portions, which form complicated paths; subspermathecae spherical, connected to the base of copulatory ducts; spermathecae elongated, about two times as long as wide; fertilisation ducts originating from the outer-posterior margins of spermathecae, bilaterally extended.

Diagnosis

The male of Hahnia jiangkou sp. nov. can be easily distinguished from other congeners by the bifurcated RTA (Fig. 1 B), whereas it is not bifurcated and generally semicircular in others. The female resembles that of H. weiningensis Huang, Chen & Zhang, 2018 in the general shape of the epigyne, especially the basally widened copulatory ducts, but it can be easily distinguished by the following: 1) the copulatory openings are medially located (Fig. 2 A) versus posteriorly located in H. weiningensis ( Huang et al. 2018: figs. 8 and 13); 2) the spermathecae are almost quadrate (Fig. 2 B) versus almost pyriform in H. weiningensis ( Huang et al. 2018: figs. 9 and 14); 3) the copulatory ducts are extending posterolaterally at base (Fig. 2 B) versus extending anterolaterally in H. weiningensis ( Huang et al. 2018: figs. 9 and 14).

Etymology

The specific name derives from the type locality: Jiangkou County; noun in apposition.

Distribution

Known only from the type locality in Guizhou, China (Fig. 3 ).

Taxon discussion

The species is placed into Hahnia due to its sharing a series of consistent characters with other congeners, such as the presence of patellar apophysis, membranous median apophysis, cymbial furrow and filiform embolus originating retrolaterally, as well as the presence of spherical subspermathecae. However, it is worth mentioning that the species is also unique for the bifurcated RTA, the absence of an epigynal hood (vs. semicircular RTA, with a pair of hoods generally located behind the epigastric furrow in others), all of which indicate that its generic position may need further confirmation.

Figures

Figure 1. Male palp of Hahnia jiangkou sp. nov., holotype. A ventral; B retrolateral. Scale bars: 0.1 mm. Abbreviations ： C conductor; CF cymbial furrow; E embolus; MA median apophysis; RPA retrolateral patellar apophysis; RTA retrolateral tibial apophysis.

Figure 2. Hahnia jiangkou sp. nov. female paratype and male holotype. A epigyne, ventral; B vulva, dorsal; C male habitus, dorsal; D ditto, ventral; E female habitus, dorsal; F male carapace, frontal; G male chelicera, posterior. Scale bars: A, B, G (0.1 mm); C-E (0.5 mm); F (0.2 mm). Abbreviations: AR atrial ridge; At atrium; CD copulatory duct; FD fertilisation duct; S spermatheca; Ss subspermatheca.

Figure 3. The type locality of Hahnia jiangkou sp. nov.