The "'cave physa "'( " Physella spelunca " ) is a species of small, air-breathing, freshwater snail, an aquatic pulmonate gastropod mollusk in the family Physidae.
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The generic name comes from two Greek words, " physa " ( a bladder ) and " stege " ( a covering ), referring to the calyx, which becomes full of fruit when mature.
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""'Physella gyrina " "', common name the " tadpole physa ", is a species of small, left-handed or sinistral, air-breathing freshwater snail, an aquatic pulmonate gastropod mollusk in the family Physidae.
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This species has a small, left-handed ( or sinistral ) shell, as is always the case in this family . " Physa aridi " dates from the Senonian ( Upper Cretaceous ) of the Bauru Group, in S�o Paulo state, Brazil.
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This species has a small and left-handed ( or sinistral ) shell, as is always the case in this family . " Physa mezzalirai " dates from the Turonian to Santonian-aged Adamantina Formation ( Upper Cretaceous Bauru Group ), in S�o Paulo state, Brazil.
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The "'Wet rock physa "', scientific name " "'Physella zionis " "', is a species of freshwater snail, an endemic to two connected canyons, Zion Canyon and Orderville Canyon, along the north fork of the Virgin River in Zion National Park, Washington County, Utah, a stretch of about ( Oliver & Bosworth 1999 ).
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Tropical freshwater refugiums often contain large amounts of aquarium plants, primarily " Vallisneria ", " Anubias ", " Cabomba ", " Echinodorus ", " Microsorum ", " Cladophora ", Java moss and " Fontinalis ", but like marine tanks they often contain scavengers such as several species of prolific snails which are often Ramshorn snails and " Physa " and prolific shrimp such as cherry shrimp.
