The nomenclatural status of Palaeothrissum inaequilobum Blainville, 1818, P. parvum Blainville, 1818, and Aeduella blainvillei (Agassiz, 1833) (Actinopterygii, Aeduellidae)

It is shown that the species names Palaeothrissum inaequilobum BLAINVILLE, 1818, and P. parvum BLAINVILLE, 1818, from the Lower Permian (Asselian) of Muse, near Autun (Saone-et-Loire department, France) are senior synonyms of the widely used species name, Aeduella blainvillei (AGASSIZ, 1833). In the interest of nomenclatural stability, conditions exist which allow reversal of precedence as stated in Article 23.9.1 of the International Code of Zoological Nomenclature. Thus the species name Aeduella blainvillei (AGASSIZ, 1833) is regarded as valid, qualifying as a nomen protectum, whereas Palaeothrissum inaequilobum BLAINVILLE, 1818, and P. parvum BLAINVILLE, 1818, are invalid, qualifying as nomina oblita. Some of the specimens from the type series upon which P. inaequilobum, P. parvum and Aeduella blainvillei were erected, are identified.