Burmatheridon cetani 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 : 57-58

Burmatheridon cetani Jiang & Li , sp. nov. ( Figs 52–54 )

Holotype. Male (IZCAS-Ar42702Fo). Late Cretaceous amber from Hukawng Valley. Syninclusion includes one spiderling.

Etymology. The species name is a popular Burmese boy’s name and means “hawk”; noun in apposition.

Diagnosis. The new species can be distinguished from B. sinespinae (see Wunderlich & Müller, 2018: 117, figs 219– 222, photos 54–55) by the shape of the apophysis on the palp. B. sinespinae has four apophyses (a serrated tegular apophysis, two thin tegular apophyses, and a long apophysis) that are different from those of B. cetani Jiang & Li , sp. nov., which has three apophyses (embolus, median apophysis, and conductor).

Description. Male. Total length 1.32; carapace 0.59 long, 0.44 wide; opisthosoma 0.73 long, 0.68 wide. Left palp: - (0.51 + 0.23 + -), 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: - (0.49 + 0.20 + -), right leg I: 3.57 (1.07 + 0.19 + 1.12 + 0.82 + 0.37), leg II: 2.31 (0.78 + 0.22 + 0.60 + 0.73 + 0.35), leg III: - (- + 0.16 + 0.37 + 0.26 + 0.30), leg IV: - (0.63 + 0.28 + 0.56 + - + -). Eye sizes and interdistances: ALE 0.05, AME 0.04, PLE 0.05, PME 0.05; AME–AME 0.09, AME–ALE 0.06, PME–PLE 0.07, PME–PME 0.06. Habitus as in Figs 53A–B . Carapace almost oval, yellow, short, with brown setae. Sternum yellowish, round, with dense setae. Labium not visible. Legs have two rows of strong setae on metatarsus and tarsus, 3 claws. Opisthosoma oval, yellowish.

Palp ( Figs 52A–D , 54 ). Femur longer than patella, patella and tibia without apophyses. Embolus slender, sclerotized. Base of embolus irregular polygon shaped, serrated at edge, median apophysis originates from tegulum, sclerotized, slender, conductor deformed, subtegulum small.

Figures

Figure 52. Burmatheridon cetani Jiang & Li, sp. nov., holotype male (IZCAS-Ar42702Fo). A–B. Right palp (A. Retrolateral view; B. Ventral view); C–D. Left palp (C. Ventral view; D. Retrolateral view). Scale bars=0.05mm.

Figure 53. Burmatheridon cetani Jiang & Li, sp. nov., holotype male (IZCAS-Ar42702Fo), habitus. A. Dorsal view; B. Ventral view. Scale bars=0.50mm.

Figure 54. Burmatheridon cetani Jiang & Li, sp. nov., holotype male (IZCAS-Ar42702Fo), left palp, ventral view. Scale bar = 0.05mm.