Fluctus bannaensis Jin & Zhang 2020, sp. nov.
Creators: name: Jin, Chi
name: Zhang, Feng
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Araneae
Corinnidae
Fluctus
Fluctus bannaensis

description: Fluctus bannaensis sp. nov. (DZAEdzdzH)
Figs 1A, B, D, 2–4
Type material. Holotype: ♂, CHINA: Yunnan Province, Jionghong City, Xishuangbanna Primeval Forest Park (22°01.657′N, 100°53.487′E), 832 m a.s.l., 17 October 2016, leg. Guiqiang Huang, Xiangbo Guo and Yanchao Wang. Paratypes: 2♀, same data as holotype. All the type specimens were immature when they were collected and later raised to maturity. The maturity date was: 10 January 2017 for ♂ (holotype); 3 March 2017 and 20 April 2017 for two ♀ (paratypes).
Etymology. The specific name is derived from the type locality; adjective.
Diagnosis. The new species resembles F. tengchongensis sp. nov., but can be distinguished from it by: 1) abdominal longitudinal wave-shaped patch is longer and more obvious than in F. tengchongensis sp. nov. (Figs 2A, E, 5A, E); 2) male dorsal scutum and ventral sclerite are separated (Fig. 2B), whereas they are fused to wrap the entire abdomen in F. tengchongensis sp. nov. (Fig. 5B); 3) the helix of the embolus is more stretched than in the latter (Figs 3D, 6D); 4) epigynal median plate is narrower than in the latter (Figs 4D, 7D); 5) ST1 close together and equal in size to ST2 (Fig. 3F), whereas ST1 separated from each other and smaller than ST 2 in F. tengchongensis sp. nov. (Fig. 6F); 6) fixed sclerite of vulva more like V-shaped and thicker than that of the latter (Fig. 3F), whereas it is obviously Y-shaped and thinner in F. tengchongensis sp. nov. (Fig. 6F).
Description. Male (Figs 1A, 2 A–D, 3A–D, 4A–C). Holotype: body 7.76 long; carapace 3.39 long, 2.36 wide, width/length= 0.70; abdomen 4.37 long, 2.15 wide. Diameters of eyes: AME 0.15, ALE 0.12, PME 0.13, PLE 0.13. Eye interdistances: AME–AME 0.11, AME–ALE 0.03, ALE–ALE 0.41, PME–PME 0.17, PME–PLE 0.08, PLE–PLE 0.57, ALE–PLE 0.06. OAW 0.75, CRW 1.26, OAW/CRW= 0.60. CRW/carapace width= 0.53. MOA 0.40 long, front width 0.40, back width 0.45. Clypeus height 0.27, 1.80 times of AME diameter. Chelicerae with three promarginal and two retromarginal teeth. Labium 0.35 long, 0.48 wide. Sternum 1.57 long, 1.25 wide. Measurements of legs: leg I 9.07 (2.35 + 0.94 + 2.13 + 2.08 + 1.57), II 8.25 (2.18 + 0.78 + 2.02 + 1.94 + 1.33), III 8.16 (2.20 + 0.98 + 1.70 + 2.04 + 1.24), IV 11.16 (2.84 + 1.16 + 2.50 + 3.31 + 1.35). Leg spination: femora: I pl 1 do 2 dt 1, II pl 1 do 2 dt 2, III pl 1 rl 1 do 2 dt 3, IV pl 1 do 2 dt 3; tibiae: I plv 3 rlv 3, II plv 2 rlv 2, III–IV pl 2 rl 2 plv 2 rlv 2 vt 2; metatarsi: I–II plv 2 rlv 2, III–IV plv 2 rlv 2 vt 1 plt 1 rlt 1 dt 2 pld 2 rld 2. Palpal spination: femur: pl 1 do 2, patella: pl 1 do 2, tibia: pl 2 do 2, tarsus: pl 3 plv 1 rlv 1. Abdominal longitudinal wave-shaped patch long and obvious; dorsal scutum and ventral sclerite separated.
Palp (Figs 3 A–D, 4A–C): tibial ventral groove distinct, more towards prolateral face; retrobasal paracymbial spine short, pointed retrolaterally; sperm duct relatively thin; prolateral side of subtegulum undulating, with middle part membranous; embolus short, with tip pointed anteriorly.
Female (Figs 1B, D, 2 E–H, 3E–F, 4D–E). Total length 8.37–8.77 (n=2). One paratype: body 8.37 long; carapace 3.89 long, 2.72 wide, width/length= 0.70; abdomen 4.48 long, 2.69 wide. Diameters of eyes: AME 0.16, ALE 0.14, PME 0.15, PLE 0.15. Eye interdistances: AME–AME 0.11, AME–ALE 0.02, ALE–ALE 0.47, PME–PME 0.20, PME–PLE 0.10, PLE–PLE 0.58, ALE–PLE 0.06. OAW 0.86, CRW 1.53, OAW/CRW= 0.56. CRW/carapace width= 0.56. MOA 0.40 long, front width 0.42, back width 0.49. Clypeus height 0.28, 1.75 times of AME diameter. Chelicerae with three promarginal and two retromarginal teeth. Labium longer than wide. Sternum 1.82 long, 1.51 wide. Measurements of legs: leg I 9.77 (2.68 + 1.04 + 2.36 + 2.13 + 1.56), II 9.33 (2.57 + 1.11 + 2.04 + 2.10 + 1.51), III 8.91 (2.46 + 1.07 + 1.83 + 2.18 + 1.37), IV 12.41 (3.17 + 1.11 + 2.80 + 3.62 + 1.71). Leg spination: femora: I pl 1 do 2 dt 1, II do 2 dt 2, III–IV pl 1 do 2 dt 3; tibiae: I plv 3 rlv 3, II plv 2 rlv 2, III–IV pl 2 rl 2 plv 2 rlv 2 vt 2; metatarsi: I–II plv 2 rlv 2, III–IV plv 2 rlv 2 vt 1 plt 1 rlt 1 dt 2 pld 2 rld 2. Palpal spination: femur: pl 1 do 2 mv 5, patella: pl 1 do 2, tibia: pl 2 do 2, tarsus: pl 1 plv 1 rlv 1 pld 1 rld 1. Abdominal wave-shaped patch long, for entire length of abdomen.
Epigyne (Figs 3E, 4D): median plate narrow, inconspicuous; epigynal depression longitudinal and slightly curved; copulatory openings with crescentic ridges directed postero-laterally. Vulva (Figs 3F, 4E): copulatory ducts short; ST1 and ST2 round, with almost same size, lying close together; fixed sclerite V-shaped.
Distribution. Known only from the type locality (Fig. 8).
description: Published as part of Jin, Chi & Zhang, Feng, 2020, Fluctus gen. nov., a new castianeirine genus from Yunnan, China (Araneae: Corinnidae), pp. 161-172 in Zootaxa 4821 (1) on pages 163-164, DOI: 10.11646/zootaxa.4821.1.9, http://zenodo.org/record/4398352