Petrarca nozawai sp. nov., holotype, general view, light microscopy (C–F after treatment with KOH solution). A, B, lateral view, right and left sides, respectively. C–E, lateral, dorsal and ventral views, respectively, ventral papillae from (C) enlarged in oval outline, body proper observed between carapace valves in (E). F, body proper position between carapace valves, lateral view, right valve removed, first abdominal segment numbered. Abbreviations: a1, antennules; oc, oral cone; pa, papillae; pe, penis; rab, rudimentary abdomen; thp, thoracopods. Scale bars in µm.