Cretotheridion champoi Jiang & Li, 2022

Xin, Yafei, Jiang, Tongyao, Yao, Zhiyuan & Li, Shuqiang, 2022, Twenty new spider species (Arachnida: Araneae) from Late Cretaceous Kachin amber (Myanmar), Zoological Systematics 47 (1), pp. 1-65 : 59-64

Cretotheridion champoi Jiang & Li , sp. nov. ( Figs 55–57 )

Holotype. Male (IZCAS-Ar42703Fo). Late Cretaceous amber from Hukawng Valley. No biotic syninclusions. Etymology. The species name is a popular Burmese boy’s name and means “He is friendly”; noun in apposition. Diagnosis. The new species can be distinguished from C. inopinatum (see Wunderlich, 2015: 343, figs 398–406, photo 175) by the shape of the median apophysis. The median apophysis of the new species is an irregular polygon-shaped apophysis, but the median apophysis of C. inopinatum is circular. The conductor of the new species is rectangular and undivided, but the conductor of C. inopinatum is divided into two parts.

Description. Male. Total length 1.46; carapace 0.72 long; opisthosoma 0.74 long. Left palp: - (0.47 + 0.13 + -), left leg I: 4.04 (1.24 + 0.23 + 1.10 + 1.18 + 0.29), leg II: 2.50 (0.75 + 0.18 + 0.59 + 0.64 + 0.34), leg III: - (0.51 + 0.12 + - + - + -), leg IV: 2.18 (0.69 + 0.11 + 0.52 + 0.55 + 0.31); right palp: - (0.50 + 0.12 + -), right leg I: 2.86 (1.03 + 0.27 + 0.78 + 0.59 + 0.19), leg II: 2.23 (0.72 + 0.22 + 0.57 + 0.54 + 0.18), leg III: 1.30 (0.45 + 0.11 + 0.26 + 0.28 + 0.20), leg IV: 1.96 (0.79 + 0.18 + 0.36 + 0.43 + 0.20). Eye sizes and interdistances: ALE 0.07, AME 0.03, PLE 0.08, PME 0.06; AME–AME 0.05, AME–ALE 0.07, PME–PLE 0.08, PME–PME 0.06. Habitus as in Figs 56A–B . Carapace almost oval, yellow, with brown setae. Sternum yellowish, round, with dense hairs. Labium 0.16 long, 0.10 wide. Legs have strong setae on metatarsus and tarsus, 3 claws. Opisthosoma oval, yellowish.

Palp ( Figs 55A–B , 57 ). Femur longer than patella, patella, and tibia without any apophyses. Embolus slender, median apophysis originates from tegulum, sclerotized, irregular polygon-shaped, conductor rectangular, theridiid tegular apophysis triangular.

Figures

Figure 55. Cretotheridion champoi Jiang & Li, sp. nov., holotype male (IZCAS-Ar42703Fo). A. Left palp, retrolateral view; B. Right palp, retrolateral view. Scale bars=0.05mm.

Figure 56. Cretotheridion champoi Jiang & Li, sp. nov., holotype male (IZCAS-Ar42703Fo), habitus, lateral view, arrows point at macrosetae on femur. Scale bars=0.50mm.

Figure 57. Cretotheridion champoi Jiang & Li, sp. nov., holotype male (IZCAS-Ar42703Fo), right palp, retrolateral view. Scale bar =0.05mm.