Along with other distinct traits, robust australopithecines had large temporalis muscles and a sagittal crest, and large premolars and molars adapted for grinding food.
Robust australopithecines belong to the Australopithecus genus, they are known as robust because of their dietary adaptations that allowed them to eat hard and fibrous food that needs vigorous chewing and grinding.
They were adapted to eat seeds, nuts, plant roots, tubers, etc. They had large temporalis muscle (major muscle for chewing) and a large sagittal crest for attachment of temporalis muscle to the skull for chewing hard and fibrous foods.
They also had large premolars and molars to aid in chewing tough plant materials like roots and tubers.
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