In spite of a continuously expanding physeteroid fossil record, our understanding of the origin and
early radiation of the two modern sperm whale families Kogiidae Gill, 1871 (including the pygmy
and dwarf sperm whales, Kogia spp.) and Physeteridae Gray, 1821 (including the great sperm whale,
Physeter Linnaeus, 1758) remains limited, especially due to the poorly resolved phylogenetic relationships of a number of extinct species. The discovery of a new diminutive physeteroid cranium from the late Miocene (Tortonian) of Antwerp leads to the description and comparison of a close relative of T. Antwerpiensis.
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