Euryeidon cervicornis Zhang & Li & Yang & Zhang 2025, sp. nov.

Euryeidon cervicornis Zhang & Zhang sp. nov. Figures 6–8, 15 Type material. Holotype ♂ (MHBUARA-2024-881-4; voucher code: HBZ011; Genbank Accession Number: PX069842), CHINA: Yunnan, Yingjiang County, Tongbiguan Town, 24.6268°N, 97.6395°E, 1371.6 m elev., 5 October 2024, leg. K. Yu. Paratype. 1♀ (MHBUARA-2024-885-1; voucher code: HBZ015; Genbank Accession Number: PX069843), CHINA: Yunnan, Yingjiang County, Nabang Town, 24.7507°N, 97.5685°E, 280.08 m elev., 8 October 2024, leg. Y. Xu. Etymology. The specific epithet is derived from the combination of Latin words: ‘ cervus ’ (meaning deer) and ‘ cornu ’ (meaning horn), referring to the RTA that is shaped like a deer’s antler in the front view. Diagnosis. The male of this new species resembles Euryeidon sonthichaiae Dankittipakul & Jocqué, 2004 in having a filiform, whip-like embolus and a J-shaped median apophysis (see Dankittipakul & Jocqué, 2004: 763, figs 35–36), but can be distinguished by: 1) the trifurcate RTA (Figs 7B–C, 8B–C, vs. bifurcate in E. sonthichaiae); 2) the inverted boot-shaped DTA (Figs 7C, 8C, vs. absent in E. sonthichaiae); 3) the boat-shaped distal tegular apophysis (Figs 7B, 8B, vs. roughly axe-shaped in E. sonthichaiae). The female of this new species resembles E. consideratum Dankittipakul & Jocqué, 2004 in the absence of epigynal median plate and the indistinct copulatory openings (see Dankittipakul & Jocqué, 2004: 764, figs 39–40; Gong & Zhong, 2025: 3, figs 5A–C), but can be distinguished by: 1) the lightbulb-shaped atrium which is about 1/2 epigynal width (Figs 7D, 8D, vs. elongate archshaped, ca. 1/6–1/5 of epigynal width in E. consideratum); 2) sub-spherical shaped spermatheca (Figs 7E, 8E, vs. tubular, strongly convoluted in E. consideratum). Description. Male (holotype, Figs 6A–B): total length 5.51; carapace 3.29 long, 2.23 wide; abdomen 2.22 long, 1.66 wide. Carapace oval, surface granulated, dark brown. Cervical groove and radial grooves indistinct, fovea longitudinal, reddish brown. Eye sizes and interdistances: AME 0.10, ALE 0.12, PME 0.10, PLE 0.11; AME‒AME 0.08, AME‒ALE 0.23, ALE‒ALE 0.67, PME‒PME 0.10, PME‒PLE 0.36, PLE‒PLE 0.91, ALE‒PLE 0.05. MOA 0.36 long, anterior width 0.34, posterior width 0.34. CH 0.63. Chelicerae dark brown, with two promarginal teeth and without retromarginal teeth. Labium triangular, reddish-brown. Endite nearly triangular, apex white, with black scopula. Sternum reddish-brown, with darker edges. Sternum yellow, 1.30 long, 1.26 wide. Leg measurements: Ⅰ 8.17 (2.25, 0.86, 1.96, 1.71, 1.39), II 7.38 (2.03, 0.88, 1.56, 1.68, 1.23), III 6.97 (1.87, 0.89, 1.34, 1.72, 1.15), IV 9.41 (2.41, 0.91, 2.00, 2.54, 1.55); leg formula 4123. Abdomen dorsum brown, anteriorly with fusiform cardiac pattern. Palp (Figs 7A–C, 8A–C). Tibia short, approximately 1/3 of cymbium length, with papilliform protuberance at ventral base. VTA rectangular. RTA well-developed, with one anterior branch and two posterior branches: anterior branch pointing forward and extending to ventral side of cymbium, the middle branch short and beak-like, and dorsal branch long, extending beyond dorsal margin of cymbium in retrolateral view, with a spinose projection at 1/3 distance from apex. DTA inverted and boot-shaped, half of cymbium length, heavily sclerotized. MA J-shaped, flat. TA navicular, with base adjacent to base of MA, apex sharp, heavily sclerotized. Embolus slender, whip-like, extending clockwise from 7-o’clock position to the 1-o’clock position. Female (paratype, Figs 6C–D): total length 6.56, carapace 2.85 long, 1.83 wide; abdomen 33.15 long, 2.26 wide. Eye sizes and interdistances: AME 0.09, ALE 0.12, PME 0.11, PLE 0.13; AME ‒ AME 0.04, AME ‒ ALE 0.23, ALE ‒ ALE 0.57, PME ‒ PME 0.07, PME ‒ PLE 0.30, PLE ‒ PLE 0.85, ALE ‒ PLE 0.07. MOA 0.34 long, anterior width 0.23, posterior width 0.29. CH 0.60. Cheliceral teeth as in male. Sternum 1.26 long, 1.09 wide. Leg measurements: I 6.09 (1.72, 0.75, 1.37, 1.17, 1.08), II 5.37 (1.47, 0.73, 1.09, 1.16, 0.92), III 5.22 (1.47, 0.75, 0.97, 1.23, 0.80), IV 7.17 (1.86, 0.74, 1.52, 1.96, 1.09); leg formula 4123. Coloration as male, but abdomen lacking distinct patterns. Epigyne (Figs 7D–E, 8D–E). Atrium lightbulb-shaped, longer than wide, anterior and lateral edges sclerotized. Median plate absent. Copulatory opening indistinct. Copulatory duct flattened and tubular. Spermatheca globular. Band sclerotized, arc-shaped. Fertilization ducts pointing anterolaterally. Remarks. The male (HBZ011) and female (HBZ015) were collected at different localities, but they have a low genetic distance (0.44%). Consequently, we consider the male and female to be conspecific. Distribution. Known only from Yingjiang County (Fig. 15).