Bicornoculus wunnai 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 : 46-48

Bicornoculus wunnai Jiang & Li , sp. nov. ( Figs 40–42 )

Holotype. Male (IZCAS-Ar42698Fo). Late Cretaceous amber from Hukawng Valley. No biotic syninclusions.

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

Diagnosis. This 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. 40B ). In B. wunnai Jiang & Li , sp. nov., the distal part of the embolus is strongly hooked, but the embolus of B. granulan s is straight.

Description. Male. Total length 1.92; carapace 0.91 long, 0.62 wide; opisthosoma 1.01 long, 0.56 wide. Left palp: - (0.24 + - + -), left leg I: - (0.85 + - + - + - + -), leg II: - (0.58 + - + - + - + -), leg III: - (0.55 + - + - + - + -), leg IV: - (0.69 + - + - + - + -); right palp: - (0.23 + - + -), right leg I: - (0.75 + - + - + - + -), leg II: - (0.62 + - + - + - + -), leg III: - (0.57 + - + - + - + -), leg IV: - (0.61 + - + - + - + -). Eye sizes: ALE 0.05, PLE 0.06, PME 0.06, eyes interdistances not visible. Habitus as in Figs 41A–B . Carapace ( Figs 41A–B ) reticulated, brown; clypeus brown; six eyes ( Fig. 41C ) almost ovoid, ALE <PLE = PME; sternum reticulated, rugose. Opisthosoma ( Figs 41A–D ): Scutum long, oval, covered with long setae, reticulated, center granulated; ventral scutum reticulated, margin rugose.

Palp ( Figs 40A–B , 42 ). Bulb long, deformed, S-shaped in dorsal view, bent twice; embolus sclerotized, slender; distal part of embolus fishhook shaped, tip slightly hooked.

Figures

Figure 40. Bicornoculus wunnai Jiang & Li, sp. nov., holotype male (IZCAS-Ar42698Fo). A. Right palp, dorsal view; B. Left palp, dorsal view. Scale bars=0.05mm.

Figure 41. Bicornoculus wunnai Jiang & Li, sp. nov., holotype male (IZCAS-Ar42698Fo). A–B. Habitus (A. Dorsal view; B. Ventral view); C. Ocular area, dorsal view; D. Claw, ventral view. Scale bars:A–B=0.50mm; C–D=0.10mm.

Figure 42. Bicornoculus wunnai Jiang & Li, sp. nov., holotype male (IZCAS-Ar42698Fo), left palp, dorsal view. Scale bar=0.10mm.