Amphithalamus immigrus is an extinct species of minute sea snails, marine gastropod mollusks or micromollusks in the family Anabathridae.
Distribution Fossils of this species were found in Aquitaine, France.
References
Lozouet P. (1998). Nouvelles espèces de gastéropodes (Mollusca: Gastropoda) de l'Oligocène et du Miocène inférieur de l'Aquitaine (Sud-Ouest de la France). Cossmanniana. 5(3-4): 61-102.