Petrarca goanna, general view and mantle (carapace) structures (SEM). A, habitus, lateral view, right side. B, external surface of mantle, central part. C, external surface of mantle with few papillae/teeth, ventral view. D, external papilla of mantle, ventral view. E, tip of papilla with micropores (indicated by arrowhead). F, habitus with right valve removed (first abdominal segment numbered). G, surface of internal cuticle of mantle. H, ctenoid scales on dorsal surface of thorax. Abbreviations: a1, antennule; ad, adductor muscle; oc, oral cone; pe, penis; rab, rudimentary abdomen; thp, thoracopods. Scale bars in µm.