Beachcombing find: 'sailor's eyeball' algae is one of Earth's largest single cells

generativist · x · 2026-09-20

A parent shares a find from Key Biscayne beach: a "sailor's eyeball" (Valonia ventricosa), slightly bigger than a golf ball. This bubble algae, found in tropical and subtropical oceans, is among the largest known unicellular organisms.

It has a coenocytic structure with multiple nuclei, a large multilobular central vacuole, and peripheral cytoplasm only 40 nm thick, with cytoplasmic domains connected by microtubule-supported bridges. Despite looking like a solid sphere, the whole thing is a single cell.

Original post →

More from Fun

Fun channel →