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• a Until 1974 the species was generally known as P. catodon. In that year, however, Husson & Holthuis proposed that the correct name should be P. macrocephalus, the second name in the genus Physeter published by Linnaeus concurrently with P. catodon. This proposition was based on the grounds that the names were synonyms published simultaneously, and, therefore, the ICZN principle of "First Reviser" should apply. In this instance, it led to the choice of P. macrocephalus over P. catodon, a view re-stated in Holthuis, 1987. This has been adopted by most subsequent authors, although Schevill (1986 and 1987) argued that macrocephalus was published with an inaccurate description and that therefore only the species catodon was valid, rendering the principle of "First Reviser" inapplicable. At the present time, the name P. catodon is used in the Catalogue of Life. However, this is expected to be changed to follow the most recent version of ITIS, which has recently altered its usage from P. catodon to P. macrocephalus following L. B. Holthuis, and recent (2008) discussions with relevant experts (refer cited ITIS page for additional information).[7][86][87][88][89][90]

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