Oxyopes striagatus Song, 1991

Lo, Ying-Yuan, Cheng, Ren-Chung & Lin, Chung-Ping, 2021, Species delimitation and taxonomic revision of Oxyopes (Araneae: Oxyopidae) of Taiwan, with description of two new species, Zootaxa 4927 (1), pp. 58-86 : 75-77

Oxyopes striagatus Song, 1991

Figs 8 , 12e

Oxyopes striagatus Song, 1991: 174 , fig. 6A–D (Holotype: 1 female, Sanmen, Zhejiang, China, 1978 VII 15, depository not informed, possibly at Institute of Zoology, Chinese Academy of Sciences, Beijing, not examined). Song et al. 1997: 1725, fig. 31a–d; Song et al. 1999: 401, figs 234Q–R, 235J, 237C; Yin et al. 2012: 918, fig. 465A–E.

Material examined. All specimens from Taiwan.

1female (TESRIA05030), 29Aug.2015, Da-Ching Chang leg., Changxing Road , New Taipei City (24°56′23.4′′N, 121°33′15.1′′E, 130 m elevation) ; 2 females (TESRI Ar1439/1442), 12–13 Aug. 2015, Kuang-Ping Yu leg., Wu- shikeng Experimental Station , Taichung City (24°16′27.5′′N, 120°56′53.8′′E, 990 m elevation) ; 1 female (TESRI C04011) and 4 males (TESRI C04008/C04010/C04024/C04041), 06 Sep. 2015, Yi-Da Lai leg. , 1 female (TESRI C04068) and 1 male (TESRI C04074), 12 Mar. 2016 , 1 male (TESRI Ar1758), 14 Mar. 2016, Yi-Da Lai leg., Duona Forest Road, Kaohsiung City (22°53′16.9′′N, 120°44′16.5′′E; 1050 m elevation) ; 1 female (TESRI CX018), 11 May 2018, Ying-Yuan Lo leg., Chongliao , Nantou County (23°53′59.2′′N, 120°45′43.6′′E, 170 m elevation)

Diagnosis. Oxyopes striagatus is similar to O. macilentus in body shape and coloration, as well as genital morphology. However, it can be distinguished from the latter species by the following characters: (1) The distal median protrusion of epigyne is columnar (acuminate in O. macilentus ); (2) The base of male cymbium without lateral extension (with lateral extension in O. macilentus ).

Description. Female (TESRI CX018). Total length 8.0; carapace length 3.0, width 2.2; abdomen length 5.0, width 1.8. Carapace yellowish-green, pear shaped, with two olive-green central lines from PME extending to posterior margin, pair of same color but broader submarginal bands from PLE extending to posterior margin. Pale white bands between central and submarginal lines noticeable when alive ( Fig. 12e ) but obscure in alcohol. Fovea longitudinal. Clypeus high, with two black stripes from AME margin to front of each chelicera. Eye diameters and inter-distances: AME 0.10, ALE 0.24, PME 0.18, PLE 0.18, eye sizes ALE> PME = PLE> AME; MOA-L 0.90, MOA-AW 0.38, MOA-PW 0.60; AME-I 0.18, PME-I 0.28, AML-I 0.08, PML-I 0.28; clypeus height 0.58. Chelicerae downward with two promarginal teeth, first larger than second, one retromarginal tooth. Endite and labium longer than wide. Sternum yellowish with several setae. Abdomen fusiform, with reddish-brown cardiac mark extending to distal and approaching spinnerets, pair of conspicuous white bands on each side of cardiac mark (less obvious in ethanol). Abdomen laterally yellowish with two black stripes, white stripe between black stripes. In ventral view, broad dark longitudinal band extends from epigastric furrow to spinnerets. Legs clothed with many conspicuous long spines with distinct black stripes on venter of femur I–III and dorsum of tibia I–III. Three claws. Pedipalps bear apical claw. Measurements of pedipalp and legs: pedipalp 3.6 (1.1, 0.5, 0.8, 1.2), leg I 14.5 (3.8, 1.0, 4.2, 4.0, 1.5), leg II 12.9 (3.5, 1.0, 3.7, 3.5, 1.2), leg III 10.6 (3.0, 0.9, 2.7, 3.1, 0.9), leg IV 12.8 (3.7, 0.9, 3.2, 3.9, 1.1). Leg formula: I> II ≒ IV> III. Epigyne sclerotized on posterior edge with columnar median projection. Pair of spermathecae visible though exoskeleton. Copulatory ducts thick, curved, arc-shaped, with rounded spermathecae on apical side. Fertilization ducts slender, elongate with hook-like apex.

Male (TESRI Ar1758). Body shape and coloration similar to those of female, but markings more variegated, abdomen thinner. Total length 7.3; carapace length 3.1, width 2.4; abdomen length 4.2, width 1.5. Eye diameters and inter-distances: AME 0.10, ALE 0.22, PME 0.18, PLE 0.18, eye sizes ALE> PME = PLE> AME; MOA-L 0.86, MOA-AW 0.34, MOA-PW 0.56; AME-I 0.14, PME-I 0.24, AML-I 0.08, PML-I 0.28; clypeus height 0.54. Measurements of pedipalp and legs: pedipalp 4.2 (1.2, 0.4, 0.5, 2.1), leg I 14.6 (3.8, 1.0, 4.0, 4.0, 1.8), leg II 13.1 (3.6, 0.9, 3.5, 3.7, 1.4), leg III 10.7 (3.1, 0.9, 2.6, 3.0, 1.1), leg IV 13.6 (4.0, 0.9, 3.6, 3.9, 1.2). Leg formula: I> II ≒ IV> III. Palp tibia with a slight retrolateral depression and two separate apophyses: ventral retrolateral tibial apophysis larger and broad while dorsal retrolateral tibial apophysis arc shaped. Conductor curved with slender apex. Embolus slender, distal part concealed by conductor. Median apophysis distally tapered, extending ventrally with apex of conductor.

Size Variation. Three female and four male specimens were measured to quantify the morphological variations. Values are mean ± SD of females (with the male in parentheses). Total length 9.0 ± 1.6 (7.0 ± 0.5); cephalothorax length 3.1 ± 0.4 (2.9 ± 0.3), width 2.3 ± 0.3 (2.3 ± 0.2); abdomen length 5.9 ± 1.2 (4.1 ± 0.2), width 2.3 ± 0.7 (1.6 ± 0.1). Diameters of AME 0.11 ± 0.01 (0.10 ± 0.02), ALE 0.23 ± 0.03 (0.22 ± 0.02), PME 0.19 ± 0.03 (0.17 ± 0.03), PLE 0.19 ± 0.03 (0.17 ± 0.03). MOA-L 0.91 ± 0.07 (0.81 ± 0.08), MOA-AW 0.37 ± 0.03 (0.33 ± 0.03), MOA-PW 0.60 ± 0.06 (0.54 ± 0.04); AME-I 0.18 ± 0.00 (0.13 ± 0.02), PME-I 0.28 ± 0.02 (0.24 ± 0.03), AML-I 0.09 ± 0.03 (0.07 ± 0.01), PML-I 0.29 ± 0.04 (0.26 ± 0.03). Clypeus height 0.62 ± 0.11 (0.52 ± 0.06). Pedipalp 3.2 ± 0.5 (3.9 ± 0.3), leg I 14.8 ± 2.1 (14.4 ± 0.4), leg II 13.3 ± 2.0 (12.6 ± 0.6), leg III 10.9 ± 1.8 (10.1 ± 0.5), leg IV 13.1 ± 1.8 (12.3 ± 1.1).

Distribution. China ( Song 1991) and Taiwan (newly recorded).

Remark. Although we did not examine the type specimen, the original illustration and description are unequivocal to confirm that specimens from Taiwan belong to O. striagatus .

Figures

FIGURE 8. Oxyopes striagatus Song, 1991. (a–b) Epigyne (TESRI CX018): (a) ventral; (b) dorsal. (c–e) Palp (TESRIAr1758): (c) prolateral; (d) ventral; (e) retrolateral. Scale bars: 0.2 mm.

FIGURE 12. Habitus of Oxyopes macilentus L. Koch, 1878, O sertatus L. Koch, 1878, and O. striagatus Song, 1991. (a) O. macilentus, female; (b) O. macilentus, male; (c) O. sertatus, female; (d) O. sertatus, male; and (e) O. striagatus, female.