Vexillum exostium is a species of small sea snail, marine gastropod mollusk in the family Costellariidae, the ribbed miters.MolluscaBase eds. (2023). MolluscaBase. Vexillum exostium Marrow, 2019. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=1392931 on 2023-02-25
Description
The length of the shell attains 24.8 mm. Distribution This marine species was found off the Dampier Archipelago, Western Australia.
References
Marrow M.P. (2019). Seven new species of Vexillum (Gastropoda: Costellariidae) from Western Australia. Acta Conchyliorum. 19: 77–94.