Bicornoculus aungi 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 : 43-46

Bicornoculus aungi Jiang & Li , sp. nov. ( Figs 37–39 )

Holotype. Male (IZCAS-Ar42697Fo). Late Cretaceous amber from Hukawng Valley. Syninclusion includes one hemipteran.

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

Diagnosis. This species resembles B. levis (see Wunderlich, 2015: 165, figs 117–121, photo 43–44) by the spindleshaped bulb but can be distinguished by the wave-shaped embolus ( Figs 37A–D , 39 ). The embolus of the new species is longer than B. levis .

Description. Male. Total length 2.13; carapace 0.90 long, 0.55 wide; opisthosoma 1.23 long, 0.74 wide. Left palp: 0.43 (0.23 + 0.08 + 0.12), left leg I: - (0.79 + 0.22 + - + - + 0.30), leg II: 2.10 (0.71 + 0.23 + 0.51 + 0.36 + 0.29), leg III: - (0.58 + - + - + 0.32 + 0.24), leg IV: - (0.70 + - + - + 0.39 + 0.20); right palp: 0.40 (0.20 + 0.09 + 0.11), right leg I: - (0.81 + 0.22 + - + - + 0.24), leg II: - (0.61 + 0.18 + - + - + 0.20), leg III: - (0.54 + - + - + - + 0.20), leg IV: - (0.64 + - + - + 0.43 + 0.23). Eye sizes: ALE 0.05, PLE 0.06, PME 0.04, eyes interdistances not visible. Habitus as in Figs 38A–B . Carapace ( Figs 38A–B ) reticulated, brown; clypeus brown; six eyes ( Figs 38C–D ) almost ovoid, PME <ALE <PLE; sternum reticulated, rugose. Opisthosoma ( Figs 38A–B ): Scutum long, oval, covered with long setae, reticulated, center granulated; ventral scutum reticulated, margin rugose.

Palp ( Figs 37A–D , 39 ). Bulb long with two apophyses distally, apophyses curved, with serrated margin; embolus sclerotized, slender, bent twice.

Figures

Figure 37. Bicornoculus aungi Jiang & Li, sp. nov., holotype male (IZCAS-Ar42697Fo). A, C. Right palp, dorsal view; B, D. Left palp, dorsal view. Scale bars=0.05mm.

Figure 38. Bicornoculus aungi Jiang & Li, sp. nov., holotype male (IZCAS-Ar42697Fo). A–B. Habitus (A. Dorsal view; B. Ventral view); C–D. Ocular area (C. Apical view; D. Dorsal view). Scale bars: A–B=0.50mm; C–D=0.05mm.

Figure 39. Bicornoculus aungi Jiang & Li, sp. nov., holotype male (IZCAS-Ar42697Fo), right palp, dorsal view. Scale bar=0.10mm.