Adyte hyalina occurs in the North-east Atlantic Ocean and Mediterranean Sea, at depths down to about 150 metres.

[1][2] Adyte hyalina is colourless or yellowish, up to thirty millimetres long, and has a dark band running down its back.

[3] Adyte hyalina is a long-bodied scale-worm with up to about 70 segments and 15 pairs of elytra, leaving the long tail uncovered.

Parapodia with elongate acicular lobes are present, with both acicula penetrating the epidermis in notopodium but not neuropodium.

The neurochaetae are more slender and more numerous, have faint rows of spines distally, and feature minutely bidentate or simple (unidentate) tips.