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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 .
Physella heterostropha halei of the Central and Southern USA, about 1 cm long. The sinistral shell of Physella acuta. Physidae, commonly called the bladder snails, is a family of small air-breathing freshwater snails, aquatic pulmonate gastropod molluscs in the superfamily Lymnaeoidea. [3] [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.
Physella is a genus of small, left-handed or sinistral, air-breathing freshwater snails, aquatic pulmonate gastropod mollusks in the family Physidae. These snails eat algae , diatoms and other detritus .
Location of Botswana. Botswana molluscs [1] are represented by 63 native species (13 bivalves, 24 freshwater snails, 24 land snails and two slugs) and by four introduced species: Cornu aspersum, Lissachatina fulica, Physella acuta and Radix auricularia, which are potentially invasive and of economic concern.
Physella magnalacustris Walker 1901 - Great Lakes Physa; Physella mexicana Phillippi 1841 - Polished Physa; Physella microstriata — Fish Lake physaChamberlain and Berry 1930; U.S. endemic/extinct; Physella natricina — Snake River physa snail; Physella osculans Haldeman 1841 - Cayuse Physa; Physella parkeri Currier 1881 - Broadshoulder Physa
The shells of Physella species have a long and large aperture, a pointed spire, and no operculum. The shells are thin and corneous and rather transparent. Drawing of the eggs of Physella gyrina: upper image is the egg-mass showing position of eggs in envelope. Lower images is a single egg showing the position of an embryo.
P. acuta is a self-fertile snail that can undergo either sexual reproduction or self-fertilization. Noel et al. [12] experimentally tested whether accumulation of deleterious mutations is avoided either by inbreeding populations of the snail (undergoing self-fertilization), or in outbreeding populations undergoing sexual reproduction.