Passalidae, morphological details. a Ogyges coxchicopi, head. Transversal line indicates the origin (“angle”) of posterofrontal ridges b O. sandinoi, head. Transversal line indicates the origin (“angle”) of posterofrontal ridges c Anterior ventral carina of ligula of O. championi d Anterior ventral carina of ligula of O. crassulus e Laterodorsal view of pronotum of Proculejus nudicostis f Laterodorsal view of pronotum of O. championi g Posterior border of metatrochanter of O. crassulus h Posterior border of metatrochanter of P. sartorii i Ventral view of aedeagus of O. monzoni j Ventral view of aedeagus of O. crassulus k Ventral view of aedeagus of O. laevissimus.