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Fig. 7. Ostracod morphology and gas diffusion distance in two typical podocopids. Inset, section positioning view of A and B: a, longitudinal section, view A; b, sagittal section, view B. (A) Longitudinal view in an Argilloecia specimen. (B) Sagittal view in a Cyprideis specimen. The diffusion distance between water in the domiciliar cavity and the most central tissues never exceeds 60 µm. Ant, anterior; post, posterior; d, dorsal; v, ventral; sc, scaphognathite. Scale bars, 100 µm.