Oedignatha dian Lu & Li, 2023

Lu, Ying, Chu, Chang, Li, Shuqiang & Yao, Zhiyuan, 2023, On two new Oedignatha species from Xishuangbanna, China, and the first description of the female of Jacaena menglaensis Mu & Zhang, 2020 (Araneae, Liocranidae), ZooKeys 1144, pp. 197-215 : 197

Oedignatha dian Lu & Li sp. nov.

Figs 3 , 4 , 5 , 6

Type material.

Holotype: 1 ♂ (IZCAS-Ar 43819), China, Yunnan, Xishuangbanna, Mengla County, Menglun Town, XTBG, Paramichelia baillonii plantation (about 20 years old), 21°54.772'N, 101°16.043'E, 608 m, collected by pitfall traps in leaf litter, 1-15 July 2007, G. Zheng leg. Paratypes: 1 ♂ (IZCAS-Ar 43820), same data as holotype, but 21°53.823'N, 101°17.072'E, 613 m, 16-31 May 2007; 1 ♀ (IZCAS-Ar 43821), same data as holotype, but secondary tropical seasonal rain forest, 21°55.428'N, 101°16.441'E, 598 m, 1-9 October 2006; 1 ♀ (IZCAS-Ar 43822), same data as holotype, but rubber-tea plantation (about 20 years old.), 21°55.551'N, 101°16.923'E, 561 m, 16-31 July 2007.

Etymology.

The specific name refers to the type locality (Dian is a short name for Yunnan) and is a noun in apposition.

Diagnosis.

The new species resembles O. barbata Deeleman-Reinhold, 2001 (cf. Figs 3 - 6 and Deeleman-Reinhold 2001: 271, figs 362-366): the males have a similar retrolateral tibial apophysis (Figs 5B, C , 6B, C ), and the females have similar bursae and spermathecae (Figs 3F , 4B ). Males can be distinguished by the tegular apophysis entirely sclerotized distally and with small membranous outgrowth basally (arrow 3 in Figs 5C , 6C ; vs tegular apophysis elliptical in ventral view, without these features), and by the tegulum with large membranous area in middle (Figs 5B , 6B ; vs tegulum without membranous area); females by the epigyne with two round spots (Figs 3E , 4A ; vs epigyne with two long elliptical strips).

Description.

Male (holotype, IZCAS-Ar 43819; Fig. 3A, B ). Total body length 4.34: carapace 2.39 long, 1.67 wide; opisthosoma 1.95 long, 1.34 wide. Carapace reddish brown, sclerotized, with faint radial grooves and covered with pits, oval but strongly constricted at first coxae, lateral margins slightly sinuous; fovea as longitudinal slit-like. Eye sizes and interdistances: AME 0.12, ALE 0.11, PME 0.10, PLE 0.09; AME-AME 0.10, AME-ALE 0.08, PME-PME 0.23, PME-PLE 0.21, ALE-PLE 0.09; MOA 0.33 long, anterior width 0.34, posterior width 0.41. Clypeus with conical hump. Chelicerae reddish brown strongly protruding (length: 0.97) in anterior part and knee-shaped, and with basal protuberance, covered with long setae, bearing unique thin macrosetae medially crossing each other, with three promarginal teeth and five retromarginal teeth. Endites and labium reddish brown; endite constricted in middle, median margin grooved, subapically with large, semicircular membranous area, apical margin with long, curved setae. Labium 1.33 times longer than wide, with subbasal constriction. Sternum reddish brown. Legs yellowish. Leg spination as shown in Table 2 . Leg measurements: I 9.31 (2.32, 0.62, 2.43, 2.39, 1.55); II 7.10 (1.93, 0.61, 1.71, 1.77, 1.08); III 5.86 (1.63, 0.44, 1.23, 1.59, 0.97); IV 8.19 (2.23, 0.55, 1.87, 2.35, 1.19). Opisthosoma reddish brown with faint reticulate pattern, oval, with large scutum covering entire dorsum surface; venter anteriorly reddish brown, posteriorly grey. Spinnerets grey.

Palp (Figs 5A-C , 6A-C ). Tibia length/width: 0.54/0.25, distally with dorsal hump (arrow 1 in Figs 5C , 6C ), prolateral triangular process (arrow 2 in Figs 5A , 6A ), and with retrolateral tibial apophysis (length/width: 0.14/0.06) sclerotized, with dorsal branch the larger, triangular, and ventral branch thin, laminate. Cymbium long and narrow. Bulbus length/width: 0.42/0.37, 1/2 length of cymbium. Tegulum with distinct, sinuous sperm duct and large membranous area in middle. Tegular apophysis strongly sclerotized distally and with small membranous outgrowth basally (arrow 3 in Figs 5C , 6C ). Embolus filiform, curved and tapered apically, originating from 8:00-9:30 o’clock on tegulum.

Female (paratype, IZCAS-Ar 43821; Fig. 3C, D ). Total body length 5.46: carapace 2.56 long, 1.76 wide; opisthosoma 2.90 long, 1.82 wide. Color and somatic morphology as in male, except as noted. Eye sizes and interdistances: AME 0.13, ALE 0.12, PME 0.10, PLE 0.10; AME-AME 0.12, AME-ALE 0.09, PME-PME 0.21, PME-PLE 0.20, ALE-PLE 0.08; MOA 0.34 long, anterior width 0.37, posterior width 0.41. Leg measurements: I 9.76 (2.52, 0.66, 2.79, 2.57, 1.22); II 7.44 (2.24, 0.56, 1.94, 1.75, 0.95); III 6.35 (1.66, 0.58, 1.32, 1.75, 1.04); IV 9.12 (2.46, 0.64, 2.13, 2.56, 1.33). Opisthosoma brown, with scutum covering 4/5 of dorsum surface; venter of opisthosoma with epigastric scutum and with two brown stripes converging posteriorly; laterally with pale stripes.

Epigyne (Figs 3E, F , 4A, B ). Epigynal plate rectangular, length/width: 0.82/1.10, with two dark, round spots visible by transparency. Vulva with large spherical spermathecae, separated by less than their diameter from each other, roundish bursae and pair of fertilization ducts pointing antero-laterally. Copulatory openings wide, visible in ventral view. Copulatory ducts nearly elliptical in dorsal view, connecting bursae to spermathecae.

Variations.

Paratype male: total body length 5.21. Second paratype female: total body length 6.18.

Distribution.

China (Yunnan, type locality; Fig. 11 ).

Note.

The new species maybe identical to Oedignatha cf. jocquei of Ramírez (2014: 233, fig. 161f-h, based on material from Ha Tinh, Vietnam). Further studies are necessary for solid conclusion.

Figures

Figure 3. Oedignatha dian sp. nov., holotype male (A, B) and paratype female (C-F) A habitus, dorsal view B habitus, ventral view C habitus, dorsal view D habitus, ventral view E epigyne, ventral view F vulva, dorsal view. Abbreviations: B = bursa, CD = copulatory duct, CO = copulatory opening, FD = fertilization duct, SP = spermathecae. Scale bars: 1 mm (A-D), 0.2 mm (E, F).

Figure 4. Oedignatha dian sp. nov., paratype female (A, B) A epigyne, ventral view B vulva, dorsal view. Abbreviations: B = bursa, CD = copulatory duct, CO = copulatory opening, FD = fertilization duct, SP = spermathecae. Scale bars: 0.2 mm.

Figure 5. Oedignatha dian sp. nov., holotype male A-C palp A prolateral view, arrow 2 points at prolateral process B ventral view C retrolateral view, arrow 1 points at dorsal hump, arrow 3 points at membranous outgrowth. Abbreviations: E = embolus, RTA = retrolateral tibial apophysis, SD = sperm duct, TA = tegular apophysis. Scale bar: 0.2 mm.

Figure 6. Oedignatha dian sp. nov., holotype male A-C palp A prolateral view, arrow 2 points at prolateral process B ventral view C retrolateral view, arrow 1 points at dorsal hump, arrow 3 points at membranous outgrowth. Abbreviations: E = embolus, RTA = retrolateral tibial apophysis, SD = sperm duct, TA = tegular apophysis. Scale bar: 0.2 mm.

Figure 11. New distribution records of liocranid species from XTBG. Solid circle = Jacaena menglaensis; square = Oedignatha dian sp. nov.; triangle = O. menglun sp. nov.