# Provanna

Provanna is a genus of sea snails, marine gastropod mollusks in the family Provannidae.
The species was named after Dall's first wife.
This is a very old genus with species already existing in Cretaceous seep deposits off Japan (93 - 100 million years ago). The Caribbean and the Pacific fauna were isolated about 3 million years ago by the closure of the Central American Isthmus.

## Description

The apical whorls of the protoconch are lacking through decollation. The opening is then sealed with a calcareous plug. The sculpture of the ovate fusiform shell shows scattered sigmoidal axial ribs that are crossed by spiral cords. The whorls are broad.

## Habitat

They are common in hydrothermal vents, hydrocarbon cold seeps and (more rarely) on deep-water food-falls, depending on the species. Most species feed on filamentous bacteria, while others feed on detritus.

## Species

Species within the genus Provanna include:
* Provanna abyssalis Okutani & Fujikura, 2002
* Provanna admetoides Warén & Ponder, 1991
* † Provanna alexi Amano & Little, 2014
* † Provanna antiqua Squires, 1995
* † Provanna azurini Kiel, Aguilar & Kase, 2020
* Provanna beebei Linse, Nye, Copley & C. Chen, 2019
* Provanna buccinoides Warén & Bouchet, 1993
* Provanna chevalieri Warén & Bouchet, 2009
* Provanna cingulata C. Chen, Watanabe & Ohara, 2018
* Provanna clathrata Sasaki, Ogura, Watanabe & Fujikura, 2016
* Provanna cooki Linse, Nye, Copley & C. Chen, 2019
* Provanna fenestrata C. Chen, Watanabe & Sasaki, 2019
* † Provanna fortis Hybertsen & Kiel, 2018
* Provanna glabra Okutani, Tsuchida & Fujikura, 1992
* Provanna goniata Warén & Bouchet, 1986
* † Provanna hirokoae Amano & Little, 2014
* Provanna ios Warén & Bouchet, 1986
* Provanna kuroshimensis Sasaki, Ogura, Watanabe & Fujikura, 2016
* Provanna laevis Warén & Ponder, 1991
* Provanna lomana (Dall, 1918)
* Provanna lucida Sasaki, Ogura, Watanabe & Fujikura, 2016
* Provanna macleani Warén & Bouchet, 1989
* † Provanna marshalli Saether, Little & K. A. Campbell, 2010
* Provanna muricata Warén & Bouchet, 1986
* † Provanna nakagawaensis Kaim, Jenkins & Hikida, 2009
* Provanna nassariaeformis Okutani, 1990
* Provanna pacifica (Dall, 1908)
* † Provanna pelada Kiel, Hybertsen, Hyžný & Klompmaker, 2019
* Provanna reticulata Warén & Bouchet, 2009
* Provanna sculpta Warén & Ponder, 1991
* Provanna segonzaci Warén & Ponder, 1991
* Provanna shinkaiae Okutani & Fujikura, 2002
* Provanna stephanos C. Chen, Watanabe & Sasaki, 2019
* Provanna subglabra Sasaki, Ogura, Watanabe & Fujikura, 2016
* † Provanna tappuensis Kaim, Jenkins & Warén, 2008
* † Provanna urahoroensis Amano & Jenkins, 2013
* Provanna variabilis Warén & Bouchet, 1986
Several fossil species have been described, predominantly identified from hydrocarbon seep deposits (Saether et al., 2010), including:
* Provanna antiqua Squires & Goedert, 1995
* Provanna marshalli Saether, Little & Campbell, 2010
* Provanna nakagawaensis Kaim, Jenkins & Hikida, 2009
* Provanna tappuensis Kaim, Jenkins & Warén, 2008
There also are several fossil species known, but not formally described and named, from Central America, Japan, and possibly the Philippines (see Saether et al., 2010).

### Species brought into synonymy

* Provanna marianensis Okutani & Fujikura, 1990: synonym of Desbruyeresia marianensis (Okutani & Fujikura, 1990)