Priscaleclercera foshou 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 : 24-27

Priscaleclercera foshou Jiang & Li , sp. nov. ( Figs 19–21 )

Holotype. Male (IZCAS-Ar42690Fo). Late Cretaceous amber from Hukawng Valley. Syninclusions include two dipterans, one mite, and one diplopod.

Etymology. The specific name is derived from the Chinese pinyin word for “Buddha’s hand” (foshou), referring to the shape of the palpal bulb; noun in apposition.

Diagnosis. The new species can be distinguished from all other Priscaleclercera species by the shape of the palp: the proximal parts of sclerites 1 and 2 are fused; sclerite 1 has a forked tip; sclerite 2 has a serrated margin; sclerite 3 has a membranous apex.

Description. Male. Total length 1.80; carapace 0.56 long, 0.67 wide; opisthosoma 1.24 long, 0.67 wide. Left palp: 0.97 (0.39 + 0.24 + 0.34), left leg I absent, leg II: - (2.38 + 0.22 + 2.41 + - + -), leg III: 4.61 (1.42 + 0.20 + 1.27 + 1.23 + 0.49), leg IV: - (2.15 + 0.19 + - + - + -); right palp: 0.86 (0.36 + 0.15 + 0.35), right leg I: - (- + - + - + 2.37 + 0.80), leg II: - (2.34 + - + - + 2.15 + 0.74), legs III –IV absent. Eye sizes and interdistances: ALE 0.07, PLE 0.05, PME 0.07, PLE–PME 0.04. Habitus as in Figs 20A–B . Carapace ( Fig. 20B ) oval, wider than long, yellowish; clypeus brown, slanted; chelicerae with lamina, promargin with two teeth; six eyes ( Fig. 20D ) almost ovoid, ALE = PME> PLE; labium 0.23 long, slanting; sternum yellow, 0.54 long, 0.51 wide. Abdomen ( Figs 20A–B ) elongate. Anterior lateral spinnerets ( Figs 20A–B ) cylindrical, with three segments.

Palp ( Figs 19A–C , 21 ). Femur ( Fig. 19C ) has at least four short macrosetae ventrally; cymbium longer than wide, with dense brown setae; cymbium with three macrosetae: a long, curved retrolateral one with a hook, and two preapical, short, subconical ones. The bulb has a finger-shaped apophysis and three sclerites apically. Sclerite 1 forked, appressed to sclerite 2. Sclerite 2 elongate, serrated apically. Sclerite 3 with a membranous apex.

Figures

Figure 19. Priscaleclercera foshou Jiang & Li, sp. nov., holotype male (IZCAS-Ar42690Fo). A. Right palp, dorsal view; B–C. Left palp (B. Prolateral view; C. Retrolateral view, arrows point at macrosetae on femur). Scale bars=0.05mm.

Figure 20. Priscaleclercera foshou Jiang & Li, sp. nov., holotype male (IZCAS-Ar42690Fo). A–B. Habitus (A. Ventral view; B. Dorsal view); C. Mouthparts, ventral view; D. Ocular area, dorsal view. Scale bars: A–B=0.50mm; C–D=0.10mm.

Figure 21. Priscaleclercera foshou Jiang & Li, sp. nov., holotype male (IZCAS-Ar42690Fo), right palp, dorsal view. Scale bar = 0.05mm.