Contributions to the study of the comparative morphology of teeth and other relevant ichthyodorulites in living superaspecific taxa of Chondrichthyan fishes. Part B: Batomorphii 4c: Order: Rajiformes - Suborder Myliobatoidei - Superfamily Dasyatoidea - Family Dasyatidae - Subfamily Dasyatinae - Genus: Urobatis, Subfamily Potamotrygoninae - Genus: Pomatotrgon, Superfamily Plesiobatoidea - Family Plesiobatidae - Genus: Plestiobatis, Superfamily Myliobatoidea - Family Myliobatidae Subfamily Myliobatinae - Genera: Aetobatus, Aetomylaeus, Myliobatis and Pteromylaeus, Subfamily Rhinopterinae - Genus: Rhinoptera and Subfamily Mobulinae - Genera: Manta and Mobula. Addendum 1 to 4a: erratum to Genus Pteroplatytrygon. Bulletin de l'Institut Royal des Sciences Naturelles de Belgique, Biologie, 70, 5–67
