Cuttlebones of this species are known to reach at least 74 mm.
S. baxteri is possibly a junior synonym of Sepia bandensis. The placement of this species in the genus Sepia is also questionable.
The type specimen was collected near Lord Howe Island (31°33′S 159°05′E / 31.550°S 159.083°E / -31.550; 159.083). It is deposited at the Australian Museum in Sydney.Show Less