Pustinella hyalina is a species of sea snail, a marine gastropod mollusc in the family Marginellidae, the margin snails.
The specific name "hyalina" roots from the word "hyaline", which means "made of glass; transparent". the specific name is likely referring to the shell's glassy texture.
The shell size varies between 4.5mm and 8mm. This sea snail was discovered during the German South Polar Expedition.
This species is found in the cold waters along the South Shetlands, Weddell Sea and South America. It is found in the demersal range of 229âÂÂ673 m of depth and the holotype is found in the polar coordinates of 63ðS - 76ðS, 180ðE - 8ðE.