Wikipedia
Nebularia
Nebularia is a name used for a group of predatory sea snails, marine gastropod mollusks within the genus Mitra. This name was originally proposed as a subgenus, but the validity of this name as a taxon is questionable. Mitra (Nebularia) Swainson, 1840 is considered by the authoritative database WoRMS to be an "alternative representation" of Mitra Lamarck, 1798. The type species of this subgenus is Mitra coronata Swainson, 1820