Alvania beyrichii is an extinct species of minute sea snail, a marine gastropod mollusc or micromollusk in the family Rissoidae.
The length of the shell attains 1.6 mm, its diameter 1.2 mm.
Their functional type is Benthos.
Their feeding type was a grazer and also a detritus feeder.
Fossils of this species were found in Lower Oligocene strata in Belgium.