Selenocosmia zhangzhengi Lin, 2022

Lin, Ye-Jie, Chen, Haifeng & Yan, Xunyou, 2022, A new species of the spider genus Selenocosmia (Araneae, Theraphosidae) from Fujian, China, Biodiversity Data Journal 10, pp. 82406-82406 : 82406

Selenocosmia zhangzhengi Lin sp. n.

Materials

Type status: Holotype. Occurrence: recordedBy: Zheng Zhang; individualID: IZCAS-Ar42680; individualCount: 1; sex: male; Taxon : scientificName: Selenocosmia zhangzhengi; order: Araneae ; family: Theraphosidae ; Location : country: China; stateProvince: Fujian; verbatimLocality: Longyan , Xinluo District , Hengkengtou ; verbatimElevation: 1143 m; verbatimLatitude: 25.3465°N; verbatimLongitude: 117.1205°E; Event: year: 2021; month: 6; day: 13 Type status: Paratype. Occurrence: recordedBy: Chuan Liu, Linrui Yu , Xiaohan Ye , Zheng Zhang ; individualID: IZCAS-Ar42681, Ar 42682; individualCount: 2; sex: 2 females; Taxon : scientificName: Selenocosmia zhangzhengi; order: Araneae ; family: Theraphosidae ; Location : country: China; stateProvince: Fujian; locality: Longyan , Xinluo District , Hengkengtou ; verbatimElevation: 1143 m; verbatimLatitude: 25.3465°N; verbatimLongitude: 117.1205°E; Event: year: 2021; month: 7; day: 11

Description

Male (holotype, IZCAS-Ar42680) (Fig. 1 A). Total length (without chelicerae) 22.65, carapace 12.12 long, 10.51 wide, dark brown with long setae. Opisthosoma brown, hirsute. Eye group 1.86 long, 0.95 wide. MOA 0.92 long, anterior width 1.14, posterior width 1.30. Eye sizes and interdistances: ALE 0.21, AME 0.39, PLE 0.15, PME 0.19; ALE-AME 0.18, AME-AME 0.27, PLE-PME 0.11, PME-PME 0.94. Fovea slightly procurved. Chelicerae dark brown, with row of 10 promarginal teeth, 32 mesoventral denticles. Labium wider than long, with ca. 237 cuspules. Sternum yellow brown with 3 pairs of sigilla (Fig. 2 F). Legs with long and short setae. Tarsus I-III with 2 claws, tarsus IV with 3 claws, denticle number: (I 1, II 2, III 1-2, IV 1). Leg measurements: I 37.59 (12.32 + 4.88 + 7.65 + 7.21 + 5.53), II 32.29 (9.48 + 4.07 + 6.54 + 7.19 + 5.01), III 29.02 (8.51 + 4.72 + 4.81 + 6.51 + 4.47), IV 38.37 (11.12 + 4.75 + 7.82 + 9.08 + 5.60). Leg formula: 1423.

Male palpal bulb (male palp with bulb (Fig. 3 ), male palpal bulb (Figs 4 b, 5 b, 6 b, 7 b, 8 b, 9 b). Maxillae with lyra setae, with ca. 372 cuspules ventrally. Tibia with many setae laterally, swollen at base. Bulb oval, embolus slightly curved, slender, sickle shaped, with A and PS. Distal edge of embolus relatively flat.

Female (paratype, IZCAS-Ar42638) (Fig. 1 B). Total length (without chelicerae) 28.62, carapace 13.81 long, 10.08 wide, dark brown with setae. Fovea slightly procurved. Opisthosoma 16.41 long, 10.34 wide, oval, grey, hirsute. Eye group 2.25 long, 1.17 wide. MOA 1.11 long, anterior width 1.14, posterior width 1.30 (Fig. 2 H). Eye sizes and interdistances: ALE 0.58, AME 0.41, PLE 0.40, PME 0.43; ALE-AME 0.17, AME-AME 0.28, PLE-PME 0.16, PME-PME 0.97. Fovea slightly procurved. Chelicerae with row of 12 promarginal teeth, 36 mesoventral denticles. Labium with ca. 299 cuspules. Palp maxillae with lyra setae, with ca. 468 cuspules ventrally. Tarsus I-III with 2 claws, tarsus IV with 3 claws, denticle number: (I 1, II 1, III 1, IV 1-3). Leg measurements: I 34.87 (9.52 + 4.78 + 10.53 + 5.32 + 4.72), II 29.04 (8.61 + 4.94 + 6.14 + 4.83 + 4.52), III 29.81 (8.02 + 4.46 + 8.47 + 4.54 + 4.32), IV 37.94 (9.63 + 5.61 + 10.21 + 7.41 + 5.08). Leg formula: 4213.

Female genitalia (Fig. 10 ) simple. Spermathecae unilobed and long, swollen distally, without wrinkles.

Comparative material studied

Selenocosmia jiafu Zhu & Zhang, 2008: 2♂ (IZCAS), China: Yunnan: Xishuangbanna, Mengla County, Menglun Township，27.IX.2021, Conghao Yang leg.

Variation

Female (Paratypes; N2): body length: without chelicerae 20.14-28.62. Carapace 9.82-13.81 length, 7.16-10.08 wide. Chelicerae with row of 10-12 promarginal teeth, 34-36 mesoventral denticles. Labial cuspules 239-299.

Diagnosis

Selenocosmia zhangzhengi sp. n. is similar to males of S. jiafu Zhu & Zhang, 2008 and S. qiani Yu, S. Y. Zhang, F. Zhang, Li & Yang, 2021 by having the same angle of the embolus relative to the bulb. However, S. zhangzhengi sp. n. can be separated from S. qiani by the racket-shaped lyra setae on the maxillae (vs. dagger-shaped in S. qiani ). Males of S. zhangzhengi sp. n. can be distinguished from S. jiafu by the absence of long, white setae on the tibia and metatarsus of the legs (vs. present in S. jiafu ), the tip of the embolus is at an obtuse angle in S. zhangzhengi sp. n. (vs. acute angle in S. qiani ) and small ventral lamina are absent on the distal embolus (Figs 8 b, 9 b) (vs. present in S. jiafu (Figs 8 a, 9 a). BL expanded, terminal blunt round in S. zhangzhengi sp. n. (Fig. 4 b) (vs. terminal right angle in S. jiafu (Fig. 4 a)). Females of S. Selenocosmia zhangzhengi sp. n. can be differentiated from S. jiafu and S. qiani by the straight spermathecae (vs. curved in S. qiani ) and the ratio of the length of the spermathecae to the distance between the spermathecae is almost 2-3:1 (Fig. 10 ) (vs. 3:2 in S. jiafu ( Zhu and Zhang 2008)).

Etymology

The species is named after Mr. Zheng Zhang, who collected the type material; noun (name) in genitive case.

Distribution

Known only from the type locality.

Ecology

Retreats in burrows made in soil mixed with gravel, the burrows are usually about 3 to 4 cm in diameter. The spider web extends 10 to 20 cm inwards from the burrow. The spider moults inside. At night, the spider waits at the mouth of the burrow for its prey to pass by.

Figures

Figure 1. Selenocosmia zhangzhengi sp. n., live. A holotype male; B paratype female.

Figure 2. Selenocosmia zhangzhengi sp. n., holotype male (A, C-G) and paratype female (B, H, I). A male habitus; B female habitus; C chelicerae, retrolateral view; D prolateral view; E left palp maxillae; F sternum; G, H ocular tubercle; I stridulatory lyra.

Figure 3. Selenocosmia zhangzhengi sp. n., holotype, male left palp A prolateral view; B ventral view; C retrolateral view.

Figure 10. Selenocosmia zhangzhengi sp. n., vulva, dorsal view. Genitalia variation of paratypes.