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Physa is a genus of small, left-handed or sinistral, air-breathing freshwater snails, aquatic pulmonate gastropod molluscs in the subfamily Physinae of the family Physidae. [ 2 ] These snails eat algae , diatoms and detritus.
Physella natricina — Snake River physa snail; Physella osculans Haldeman 1841 - Cayuse Physa; Physella parkeri Currier 1881 - Broadshoulder Physa; Physella pomilla Conrad 1834 - Claiborne Physa; Physella spelunca Turner and Clench 1974 - Cave Physa; Physella squalida Morelet 1851 - Squalid Physa; Physella traski Lea 1864 - Sculpted Physa
Physa fontinalis, common name the common bladder snail, is a species of air-breathing freshwater snail, an aquatic gastropod mollusc in the family Physidae. The shells of species in the genus Physa are left-handed or sinistral .
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This snail is believed to be confined to the Snake River, inhabiting areas of swift current on the undersides of large cobbles and boulder-sized rocks. In 1995, the U.S. Fish and Wildlife Service reported the known modern range of the species to be from Grandview, Idaho (ca. RM 487) to the Hagerman Reach of the Snake River (ca. RM 573).
The observations are restricted to Physa fontinalis, an indigenous species to areas with indigenous predatory leeches, and Haitia acuta, introduced in Germany and the Netherlands. When Physa contacts another snail, either Physa or some other kind, the reaction is a rapid twisting of the shell back and forth to dislodge the other. The muscle ...
Physella acuta is a species of small, left-handed or sinistral, air-breathing freshwater snail, an aquatic gastropod mollusk in the family Physidae. Common names include European physa , tadpole snail , bladder snail , and acute bladder snail .
This species occurs in: Canada and the northern United States. [ 2 ] Museum specimens [ 3 ] [ 4 ] (Academy of Natural Sciences, Philadelphia; Invertebase Portal Collection) are known from Alaska, Maine, Massachusetts, New York, Pennsylvania, Ohio, Iowa, Michigan, North and South Dakota, Montana, Colorado, Wyoming, Utah, and Nevada.