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Snails in the family Physidae have shells that are sinistral, which means that if the shell is held with the spire pointing up, and the aperture is facing the observer, the aperture is on the left-hand side. The shells of Physella species have a long and large aperture, a pointed spire, and no operculum. The shells are thin and corneous and ...
These snails eat algae, diatoms and other detritus. ... Pewter Physa, [2] type species, synonyms: Physella heterostropha (Say, 1817), Physella integra (Haldeman, 1841 ...
Physella natricina — Snake River physa snail; Physella osculans Haldeman 1841 ... Altogether 36 gastropod species are federally listed as of 2 October 2009. [4 ...
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.
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).
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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 .
Like other Vitrea snails, the new species has both male and female genitalia, researchers said. Mt. Devica crystal snails were found crawling on “wet rocks” in “a small underground cavern ...