Ragactis hyalina is a small, transparent sea anemone (family Actiniidae) found in shallow coastal waters of the Indo-Pacific and Mediterranean Sea, typically inhabiting sandy or muddy substrates with the column partially buried and only the oral disc exposed. Its glass-like transparency in live specimens gives it its specific epithet. Its transparent body and small size may make it a candidate for laboratory model studies of cnidarian cellular biology. Genomic data have been generated for this species and are available in public databases, enabling comparative studies of cnidarian evolution and ecology.