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Pisidium

Pisidium is a genus of very small or minute freshwater clams known as pill clams or pea clams, aquatic bivalve molluscs in the family Sphaeriidae, the pea clams and fingernail clams.

In some bivalve classification systems, the family Sphaeriidae is referred to as Pisidiidae, and occasionally Pisidium species are grouped in a subfamily known as Pisidiinae.

Usage examples of "pisidium".

It incorporated the ancient regions of Bithynia, Mysia, Asia Province, Phrygia, Pisidia, Pamphylia, Cilicia, Paphlagonia, Galatia, Pontus, Cappadocia, and Armenia Parva.

But the effect of his promise was disappointed by the sultan's untimely death: amidst the care of the most skilful physicians, he expired of an apoplexy at Akshehr, the Antioch of Pisidia, about nine months after his defeat.