Ceratoperidinium Margalef is a genus of planktonic marine dinoflagellate rarely reported in the literature. Margalef (1969) described the type species Ceratoperidinium yeye Margalef from a single individual collected in coastal waters of the Spanish Mediterranean Sea. Margalef reported a cell body that was pentagonal in outline and compressed dorsoventrally. The cingulum was weakly impressed and a sulcus was not observed. The cell surface was rigid and lacked sculpture or relief. No thecal plates were observed. The hypotheca (hyposoma) was drawn out into two long, slightly curved, rigid, cylindrical appendices with a row of three swellings at their extremities. The tips of the antapical extensions presented a tentacle-like shape. One large pusule, plastids and small drops of lipid occur in the cytoplasm and the nucleus is centrally located. Later, Loeblich (1982, p. 108) and Sournia (1986, p. 96) translated the description by Margalef (1969) to English and French, respectively.
The type species was redescribed as C. margalefii by Loeblich (1980) because of the absence of a Latin diagnosis. As reported by Sournia (1982, p. 153), Loeblich only added the Latin diagnosis, but instead of retaining the name with a new authority, C. yeye Margalef ex Loeblich III, he proposed the new name C. margalefii Loeblich III. The case of C. yeye is comparable to that of taxa such as Petalodinium porcelio J. Cachon & M. Cachon, in which the original publication of the type species lacked the Latin diagnosis; under the International Code of Botanical Nomenclature (Greuter et al. 2000; article 45.5 ex. 5), the name should retain its original authorship and date.