Final answer:
The Dmanisi crania have not had their cranial capacities specified in provided context. For Homo ergaster, the average is about 1,100 cc, the Nariokotome Boy had 900 cc, Homo antecessor about 1,000 cc, and Homo heidelbergensis displayed a capacity of around 1,200 cc.
Step-by-step explanation:
Dmanisi Crania Cranial Capacities
The Dmanisi crania are an important find in the field of paleoanthropology and provide insight into early human ancestors. The estimated cranial capacities for the Dmanisi specimens are yet to be specified in this context. However, for reference, Homo ergaster, a related early human ancestor, has an average cranial capacity of about 1,100 cc. Paranthropus aethiopicus, another ancient relative, had a different set of cranial features. More specifically, a specimen known as the Nariokotome Boy, also of Homo ergaster, had an estimated cranial capacity of 900 cc. Comparatively, Homo antecessor had a cranial capacity of about 1,000 cc, and H. naledi, another ancient human relative, would also have had a cranial capacity within this range though the exact figure is not stated here. Lastly, Homo heidelbergensis, exhibited a cranial capacity closer to modern humans with specimens like the Petralona cranium showing 1,200 cc, a bit lower than the average modern human cranial capacity of 1,400 cc.