FIGURE 61 in A revision of the Palaeocorystoidea and the phylogeny of raninoidian crabs (Crustacea, Decapoda, Brachyura, Podotremata) 3215

FIGURE 61. Narrowing of thoracic sternum in Raninoidia. A, thoracic sternum of Notopocorystes stokesii (Mantell, 1844) (Palaeocorystidae), reconstructed after several specimens; B, thoracic sternum of Ranina ranina (Linnaeus, 1758) (Raninidae, Ranininae); C, hypothetical narrowing of thoracic sternum: transverse cross-section; D, thoracic sternum of Ranina ranina (Linnaeus, 1758) (Raninidae, Ranininae), left-hand side showing ventral (external) view, right-hand side showing section (internal) view of median plate. 6/7, 7/8, thoracic sternal sutures 6/7, 7/8; d, depression; mp, median plate; sa, spermathecal aperture.