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.
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.
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 within the genus Provanna include:
Provanna abyssalis Okutani & Fujikura, 2002Provanna admetoides Warén & Ponder, 1991† Provanna alexi Amano & Little, 2014† Provanna antiqua Squires, 1995Provanna buccinoides Warén & Bouchet, 1993Provanna chevalieri Warén & Bouchet, 2009Provanna clathrata Sasaki, Ogura, Watanabe & Fujikura, 2016Provanna glabra Okutani, Tsuchida & Fujikura, 1992Provanna goniata Warén & Bouchet, 1986† Provanna hirokoae Amano & Little, 2014Provanna ios Warén & Bouchet, 1986Provanna kuroshimensis Sasaki, Ogura, Watanabe & Fujikura, 2016Provanna laevis Warén & Ponder, 1991Provanna lomana (Dall, 1918)Provanna lucida Sasaki, Ogura, Watanabe & Fujikura, 2016Provanna macleani Warén & Bouchet, 1989† Provanna marshalli Saether, Little & K. A. Campbell, 2010Provanna muricata Warén & Bouchet, 1986† Provanna nakagawaensis Kaim, Jenkins & Hikida, 2009Provanna nassariaeformis Okutani, 1990Provanna pacifica (Dall, 1908)Provanna reticulata Warén & Bouchet, 2009Provanna sculpta Warén & Ponder, 1991Provanna segonzaci Warén & Ponder, 1991Provanna shinkaiae Okutani & Fujikura, 2002Provanna subglabra Sasaki, Ogura, Watanabe & Fujikura, 2016† Provanna tappuensis Kaim, Jenkins & Warén, 2008† Provanna urahoroensis Amano & Jenkins, 2013Provanna variabilis Warén & Bouchet, 1986Several fossil species also have been described, predominantly identified from hydrocarbon seep deposits (Saether et al., 2010), including:
Provanna antiqua Squires & Goedert, 1995 Provanna marshalli Saether, Little & Campbell, 2010Provanna nakagawaensis Kaim, Jenkins & Hikida, 2009Provanna tappuensis Kaim, Jenkins & Warén, 2008There 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 synonymyProvanna marianensis Okutani & Fujikura, 1990: synonym of Desbruyeresia marianensis (Okutani & Fujikura, 1990)
