Nassariidae

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Nassariidae Temporal range: Lower Cretaceous–Recent PreꞒ Ꞓ O S D C P T J K Pg N
A live individual of Nassarius fossatus
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Subclass:	Caenogastropoda
Order:	Neogastropoda
Superfamily:	Buccinoidea
Family:	Nassariidae Iredale, 1916 (1835)
Type genus
Nassarius Dumenil, 1805
Species
See text
Synonyms[1]
Nassidae Swainson, 1835

The Nassariidae, Nassa mud snails (US), or dog whelks (UK) are a taxonomic family of small to medium-sized snails, mostly marine gastropod mollusks in the clade Neogastropoda. These snails have rounded shells with a high spire, an oval aperture, and a siphonal notch. This family of snails is found worldwide.

These snails are found mostly in shallow water, on sandy or muddy substrates, often intertidally, but sometimes in deep water. They can be present in very large numbers in suitable habitat. Nassariidae are primarily active and lively scavengers.