“…Furthermore, the differences among the genera included in the family have become blurred since Odhner (1963), with descriptions ranging from those lacking information on important details of the internal anatomy, i.e., Tritonia taliartensis Ortea and Moro, 2009 and Marionia ghanensis Edmunds and Carmona, 2017, to those in which characters create doubt about which genus the species should be assigned to, such as the unique presence of stomach plates in Tritonia odhneri Er. Marcus, 1959, among the Tritonia, or the unicuspid rachidian in Tritonia khaleesi Silva, Azevedo and Matthews-Cascon, 2014. Most species of Marionia have been recorded in the Indo-Pacific region (Smith and Gosliner 2007, Gosliner et al 2008, García and Bertsch 2009, with only nine found in the Atlantic Ocean as follows: Marionia blainvillea Risso, 1818, Marionia cucullata (Couthouy, 1852), Marionia cabindae White, 1955, Marionia vanira Ev. Marcus and Er.…”