Pseudonininae Bertolaso & Palazzi, 1994 Provannidae is a family of deep water sea snails, marine gastropod mollusks in the superfmaily Abyssochrysoidea (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005 and updated in 2008 by Kaim et al.).

The shells of these two last genera house a hypertrophied ctenidium large quantities of symbiotic bacteria.

These snails are part of the fauna of the deep-sea hydrothermal vents, cold seeps, whale falls, and sunken driftwood environments.

[4] The family Provaniidae was previously placed in the "Zygopleuroid group" (according to the taxonomy of the Gastropoda by Bouchet & Rocroi, 2005).

It is being treated as belonging to the superfamily Abyssochrysoidea until a new family-level revision has been undertaken.