Pisidium centrale

Pisidium centrale is a small freshwater bivalve belonging to the family Sphaeriidae, commonly known as pea clams or pill clams. Like other members of this genus, it has a tiny, rounded, thin-shelled body typically only a few millimetres across. It is a filter feeder, drawing in water through siphons to extract organic particles, algae, and detritus, and in doing so contributes to the processing of organic matter and the maintenance of water clarity in the habitats it occupies.

As with related species, it likely broods young within the gill chamber before releasing juveniles, a reproductive strategy typical of Sphaeriidae.

The species is recorded from Australia, where it inhabits freshwater environments such as streams, rivers, or still water bodies. Specific habitat parameters have not been formally assessed, but populations of Pisidium species generally depend on stable substrates, adequate oxygenation, and consistent water quality.

Pisidium centrale is classified as Vulnerable, reflecting pressures on its freshwater habitat. Threats include urban development, mining and quarrying, and dam construction and water management practices that alter flow regimes and sedimentation. Agricultural runoff and effluents from cropping systems, along with unspecified pollution sources, degrade water quality, while invasive species introduce competition or habitat disruption.

Habitat shifting and alteration compound these pressures by changing the physical conditions the species requires.

No specific conservation programs targeting this species have been documented. Population trends remain unknown, limiting the ability to assess recovery or decline with precision. Given the ongoing and multiple threats affecting Australian freshwater systems, the species' outlook remains uncertain, and continued monitoring and habitat protection would be necessary to clarify its conservation trajectory.