FIG. 2 in Crayfishes from the Jehol biota

FIG. 2. — Comparison of epistomes in fossil and extant crayfishes: A, B, epistome of P. licenti (NIGP-Shen-26), photo (A) and interpretative line-drawing (B); C, epistome of P. licenti (NIGP-Shen-40); D, epistome of a female Cambaroides dauricus (Pallas, 1972) (MNHN-IU-2022-4077, extant, Mandchuria); E, Cambarus bartonii (Fabricius, 1798) (MNHN-IU-2022-4074, extant, Philadelphia, United States); F, Astacus astacus (Linnaeus, 1758) (MNHN-IU-2022-4069, extant, Nissi, Greece). Photos of fossil specimens in cross-polarized light. Abbreviations: a1, antennula; a2.ba, antennal basipodite; a2.cx, antennal coxa; epi, epistome; uo, urinary orifice (nephropore). Photographs: D. Audo. Scale bars: 2 mm.