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 In biology, detritus () is dead particulate organic material, as distinguished from dissolved organic material. Detritus ...
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Provanna Glabra
''Provanna glabra'' is a species of sea snail, a marine gastropod mollusk in the family Provannidae. Description Distribution ''Provanna glabra'' lives in the Northwest Pacific. The most sightings have been reported in Japan, but it has also been found in Taiwan Taiwan, officially the Republic of China (ROC), is a country in East Asia, at the junction of the East and South China Seas in the northwestern Pacific Ocean, with the People's Republic of China (PRC) to the northwest, Japan to the nort .... References glabra Gastropods described in 1992 {{Provannidae-stub ...
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