Physa
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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.
Lymnaea stagnalis
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Lymnaea stagnalis, better known as the great pond snail, is a species of large air-breathing freshwater snail, an aquatic pulmonate gastropod mollusk in the family Lymnaeidae. The great pond snail is
Typical shell
Great pond snail with an adult Physa sp. snail
The dissected central ring ganglia of Lymnaea stagnalis. Scale bar is 1 mm. LBuG and RBuG: left and right buccal ganglia LCeG and RCeG: left and right cerebral ganglia LPeG and RPeG: left and right pedal ganglia LPIG and RPIG: left and right pleural ganglia LPaG and RPaG: left and right parietal ganglia VG: visceral ganglion.