Arctosa tridentata Chen

Wang, Luyu, Lu, Tian, Cai, Ducheng, Barrion, Alberto Tomas, Heong, Kong-Luen, Li, Shuqiang & Zhang, Zhisheng, 2021, Review of the wolf spiders from Hainan Island, China (Araneae: Lycosidae), Zoological Systematics 46 (1), pp. 16-74 : 26-34

Arctosa tridentata Chen & Song, 1999 ( Figs 19A–F , 20A–D)

Arctosa tridentata Chen & Song, 1999: 139, figs 4–7 (♂).

Material examined. 1♂ 1♀, Danzhou City, Fanjia, Fengjidu, 19°17.988′N 109°41.837′E, elev. 188 m, 19.I.2015, C. Jin leg. ( SWUC); 1♀, Baisha County, Yacha Farm, Ten Team, 19°16.481′N, 109°27.727′E, elev. 146 m, 24.III.2015, L.Y. Wang & G.Q. Huang leg. ( SWUC) .

Diagnosis. This species is similar to A. kawabe Tanaka, 1985 ( Tanaka, 1991: 306, figs 25–28) but differs by the median apophysis with three small projections ( Figs 19C–D , 20A–B), whereas there is a single projection in A. kawabe . The terminal apophysis is finger-shaped in the new species ( Figs 19C–D , 20A–B) but knife-shaped in A. kawabe . Septum of epigyne longer than wide in the new species ( Figs 19E–F , 20C–D), as long as wide in A. kawabe .

Description. Male ( Fig. 19A ) total length 5.79. Carapace 3.00 long, 2.12 wide; opisthosoma 2.50 long, 1.76 wide. Carapace yellow-brown. Cervical groove and radial furrows indistinct. Eye sizes and interdistances: AME 0.10, ALE 0.09, PME 0.29, PLE 0.23; AME–AME 0.07, AME–ALE 0.05, PME–PME 0.16, PME–PLE 0.20. Clypeus height 0.10. Chelicerae yellow-brown. Labium yellow-brown. Endites yellow-brown. Sternum yellowish brown, with brown setae. Legs yellowbrown, with black pigmentation. Leg measurements: I 7.75 (2.12, 2.80, 1.76, 1.07); II 7.43 (2.04, 2.49, 1.82, 1.08); III 6.38 (1.69, 2.09, 1.61, 0.99); IV 10.28 (2.69, 3.41, 2.94, 1.24). Leg formula: 4123. Opisthosoma oval. Dorsum of opisthosoma yellow-brown, cardiac mark yellow-brown. Ventrum yellow-brown.

Palp ( Figs 19C–D , 20A–B). Terminal apophysis fingerlike. Embolus robust, with a bifurcate tip. Conductor membranous, rounded distally. Median apophysis robust, with three small projections.

Female ( Fig. 19B ) total length 6.59. Carapace 3.59 long, 2.47 wide; opisthosoma 2.99 long, 2.00 wide. Eye sizes and interdistances: AME 0.11, ALE 0.09, PME 0.32, PLE 0.26; AME–AME 0.09, AME–ALE 0.06, PME–PME 0.23, PME– PLE 0.24. Clypeus height 0.12. Leg measurements: I 9.10 (2.66, 3.22, 1.98, 1.24); II 8.10 (2.38, 2.77, 1.79, 1.16); III 7.70 (2.14, 2.41, 1.96, 1.19); IV 11.90 (3.08, 3.82, 3.47, 1.53). Leg formula: 4123. Opisthosoma oval. Dorsum of opisthosoma yellow-brown. Ventrum yellow-brown.

Epigyne ( Figs 19E–F , 20C–D). Septum narrow, the stem top wider anteriorly. Spermathecal heads round, spermathecal stalks long. Fertilization ducts large and crescent-shaped.

Distribution. China (Hainan).

Remarks. Although the types of A. tridentata were not examined, based on the many specimens of Arctosa examined, as well as the the original description of Chen & Song (1999), we conclude these specimens are A. tridentate .

Figures

Figure 19. Arctosa tridentata Chen & Song, 1999, male and female from Hainan. A. Male habitus, dorsal view; B. Female habitus, dorsal view; C. Left male palp, bulbus, ventral view; D. Same, retrolateral view; E. Epigyne, ventral view; F. Vulva, dorsal view. Scale bars: A–B=1.0mm; C–F=0.2 mm.