Bicornoculus yarzari 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 : 48-49

Bicornoculus yarzari Jiang & Li , sp. nov. ( Figs 43–45 )

Holotype. Male (IZCAS-Ar42699Fo). Late Cretaceous amber from Hukawng Valley. No biotic syninclusions. Etymology. The species name is a popular Burmese boy’s name and means “king”; noun in apposition.

Diagnosis. This new species resembles B. granulan s (see Wunderlich, 2020: 88, figs 78–79) by the apophysis of the bulb but can be distinguished by the shape of the embolus ( Fig. 43B ). The embolus of B. yarzari Jiang & Li , sp. nov. is a falciform structure, but the embolus of B. granulan s is straight.

Description. Male. Total length 1.68; carapace 0.76 long, 0.46 wide; opisthosoma 0.92 long, 0.50 wide. Left palp not visible, left leg I: - (- + - + - + 0.40 + 0.33), leg II: - (0.63 + - + - + 0.37 + 0.32), leg III: - (0.59 + - + - + 0.33+ 0.27), leg IV: - (0.67 + - + - + - + 0.38); right palp not visible, right leg I: - (- + - + - + 0.42 + 0.36), leg II: - (- + - + - + 0.36 + 0.34), leg III: - (- + - + - + 0.27 + 0.22), leg IV: - (- + - + - + 0.40 + 0.31). Eyes not visible. Habitus as in Figs 44A–B . Carapace ( Figs 44A–B ): carapace ( Fig. 44A ) sclerotized, reticulated, yellow; cephalic part not visible; clypeus brown; clypeus vertical anteriorly; labium triangular, distally obtuse; sternum marginally rugose. Opisthosoma ( Figs 44A–B ): Abdomen oval, covered with long setae; ventral scutum rugose.

Palp ( Figs 43A–B , 45 ). Bulb with an apophysis, 0.19 long, 0.07 (0.13 with apophysis) wide; embolus with a sclerotized apophysis, falciform.

Figures

Figure 43. Bicornoculus yarzari Jiang & Li, sp. nov., holotype male (IZCAS-Ar42699Fo). A. Right palp, dorsal view; B. Left palp, dorsal view. Scale bars=0.05mm.

Figure 44. Bicornoculus yarzari Jiang & Li, sp. nov., holotype male (IZCAS-Ar42699Fo), habitus. A. Dorsal view; B. Ventralview. Scale bars=0.50mm.

Figure 45. Bicornoculus yarzari Jiang & Li, sp. nov., holotype male (IZCAS-Ar42699Fo), left palp, dorsal view. Scale bar=0.05mm.