Paranthropus robustus
Brain

Upon describing the species, Broom estimated the fragmentary braincase of TM 1517 as 600 cc, and he, along with South African anthropologist Gerrit Willem Hendrik Schepers, revised this to 575–680 cc in 1946. For comparison, the brain volume of contemporary Homo varied from 500 to 900 cc. A year later, British primatologist Wilfrid Le Gros Clark commented that, since only a part of the temporal bone on one side is known, brain volume cannot be accurately measured for this specimen. In 2001, Polish anthropologist Katarzyna Kaszycka said that Broom quite often artificially inflated brain size in early hominins, and the true value was probably much lower.
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