Mallomonas allorgei is a silica-scaled chrysophyte flagellate in the family Mallomonadaceae, characterized by its ovoid cell body covered in intricately structured siliceous scales and bristles. It inhabits oligotrophic to mesotrophic freshwater lakes and ponds, where it contributes to phytoplankton diversity. The silica scales of Mallomonas species preserve well in lake sediments and are used as paleolimnological indicators of past water chemistry.