Cristatus anfractus Irfan & Zhang & Peng 2022, sp. nov.
Creators: name: Irfan, Muhammad
name: Zhang, Zhi-Sheng
name: Peng, Xian-Jin
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Linyphiidae
Cristatus
Cristatus anfractus

description: Cristatus anfractus sp. nov. (ỆRƦ)
Figures 76–77, 82
Types. Holotype ♂, CHINA, Yunnan, Longyang County, Bawan Township, Nankang Yakou, 24.82587°N, 98.76832°E, alt. 2148m, beating vegetation in understory forest, 26 May 2005, Ke-ji Guo leg.(GKJ027). Paratypes: 2♀, same data as holotype (GKJ027); 1♀, Gongshan County, Dulongjiang Township, Kongdang Village, 27.87961°N, 98.33878°E, alt. 1527m, 25 October 2004, Guo Tang leg. (Tang–04–04).
Etymology. This epithet derives from the Latin adjective “ anfractus ”, meaning “curved” and refers to the curved dorsal tibial apophysis in the male palp.
Diagnosis. This new species can be distinguished from Cristatus makuensis sp. nov. by the male cephalic lobe abruptly elevated, with four long spines between the posterior median eyes in C. anfractus sp. nov. (Fig. 77A, C, D), whereas not as abruptly elevated, ocular region densely covered with microsetae in C. makuensis sp. nov. (Fig. 81A, B). The reterolateral tibial apophysis longer, protruding above the dorsal tibial apophysis in C. anfractus sp. nov. (Fig. 75A–D), whereas shorter and almost equal to the tip of dorsal tibial apophysis in C. makuensis sp. nov. (Fig. 78A–D). Scapoid tongue-shaped in C. anfractus sp. nov. (Fig. 76A, B), whereas thinner and finger-shaped in C. makuensis sp. nov. (Fig. 80A, B).
Description. Male (holotype, Fig. 77A–D): Total length: 1.35. Carapace 0.69 long, 0.56 wide; cephalic lobe 0.28 long, abruptly elevated, with eyes, comprises of sulcus below the PMEs, clypeus and ocular quad presented with lots of macrosetae, four long thick macrosetae present between the PMEs, yellowish to brown; fovea, cervical and radial grooves distinct. Clypeus 0.19 high. Sternum wider than long, brown, sparsely covered with microsetae. Labium wider than long. Maxillae long, distal end broad with scopulae. Chelicerae sclerotized, pale, with four promarginal and four retromarginal teeth. Eyes: AER recurved, PER procurved, slightly wider than AER. Eye sizes and interdistances: AME 0.03, ALE 0.05, PME 0.05, PLE 0.04, AME–AME 0.04, PME–PME 0. 10, AME–ALE, 0.02, PME–PLE 0.07, AME–PME 0.12, ALE–ALE 0.24, PLE–PLE 0.25, ALE–PLE 0.01. Length of legs: I 2.47 (0.63, 0.78, 0.61, 0.45), II 2.38 (0.63, 0.76, 0.56, 0.43), III 1.93 (0.52, 0.61, 0.48, 0.32), IV 2.36 (0.64, 0.76, 0.59, 0.38). Leg formula I-II-IV-III. Tm I 0.28 and Tm IV 0.22. Patella with 2 spines. Tibial spines thick and long; tibial spine formula: 2-2-1-1. Abdomen 0.83 long, 0.59 wide, oval, pale, mid dorsally with a longitudinal greenish-grey band followed by three chevrons, ventral side pale.
Palp (Fig. 75A–D): Patella as long as tibia; tibia with one reterolateral and one dorsal trichobothria, reterolateral apophysis sclerotized extending above the dorsal tibial apophysis; dorsal tibial apophysis black, sclerotized with teeth, anteriorly with a short black tooth in dorsal view; paracymbium sclerotized, hook-shaped, distal arm with tuft of spines, tip with a small slightly curved projection, proximal end of reterolateral margin of cymbium with a row of seven thick spines; distal suprategular apophysis proximally broad, sclerotized, tip slightly curved; tegulum with a tomb shaped transparent protegulum. Embolic division: radix sclerotized, broad, round; terminal apophysis short, slightly curved; embolus long, arises from inner lateral margin of the radix, distal end forming a coiled spiral around the protegulum.
Female (one of paratypes, Fig. 77E, F): Total length: 1.51. Carapace 0.71 long, 0.60 wide; cephalic region slightly elevated, brown; fovea, cervical and radial grooves distinct, ocular region with long spines. Clypeus 0.24 high. Sternum longer than wide, brown, sparsely covered with microsetae. Labium wider than long. Maxillae long, distal end broad with scopulae. Chelicerae sclerotized, yellow, with four promarginal and four retromarginal teeth. Eyes: AER recurved, PER procurved, slightly wider than AER. Eye sizes and interdistances: AME 0.04, ALE 0.06, PME 0.05, PLE 0.05, AME–AME 0.03, PME–PME 0.07, AME–ALE, 0.01, PME–PLE 0.03, AME–PME 0.06, ALE–ALE 0.21, PLE–PLE 0.24, ALE–PLE contiguous. Length of legs: I 2.39 (0.70, 0.75, 0.59, 0.35), II 2.34 (0.66, 0.76, 0.56, 0.36), III 1.89 (0.53, 0.62, 0.43, 0.31), IV 2.32 (0.65, 0.74, 0.55, 0.37). Leg formula I-II-IV-III. Tm I 0.26 and Tm IV 0.21. Patella with 2 spines. Tibial spines thick and long; tibial spine formula: 2-2-1-1. Abdomen 1.04 long, 0.69 wide, oval, pale, mid dorsally with a longitudinal brownish-black band followed by two chevrons and a small brownish-black patch posteriorly, ventral side pale.
Epigyne (Fig. 76A–C): Scapoid sclerotized, tongueshaped, longer than wide; ventral plate transparent, wider than long, round posteriorly. copulatory openings present at the junction of dorsal and ventral plate. Vulva: Dorsal plate wider than long; copulatory ducts simple, present mesally; spermathecae globular, separated by a distance of 2/3 of their diameter; fertilization ducts small, extending mesally.
Distribution. Known only from the type locality (Fig. 82).
description: Published as part of Irfan, Muhammad, Zhang, Zhi-Sheng & Peng, Xian-Jin, 2022, Survey of Linyphiidae (Arachnida: Araneae) spiders from Yunnan, China, pp. 1-292 in Megataxa 8 (1) on pages 69-72, DOI: 10.11646/megataxa.8.1.1, http://zenodo.org/record/7526571