Introduction to Biological Anthropology: Notes 23 A world full of Plio-pleistocene hominins Copyright Bruce Owen 2011 Let s look at the next chunk of
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1 Introduction to Biological Anthropology: Notes 23 A world full of Plio-pleistocene hominins Copyright Bruce Owen 2011 Let s look at the next chunk of time: mya often called the Plio-pleistocene (end of the Pliocene, beginning of the Pleistocene) numerous species of bipedal apes (hominins), more varied adaptations in some times and places, 2 or 3 hominins lived in the same environment at the same time Australopithecus species presumably descendents of the earlier A. afarensis and maybe others at least 5 species during this period up to 2, probably 3 at the same time called australopithecines in general Paranthropus species at least 3 species during this period up to 2 at the same time called paranthropines in general plus possible descendents of Kenyanthropus, although no fossils have been found yet plus, halfway through this period (1.8 mya), the first species of our genus: Homo we ll look at those later All the Plio-pleistocene hominins (3.0 to 1.0 mya) shared certain basic features: all bipedal all had similar small bodies, only slightly larger than Lucy (A. afarensis) all had chimp-size brains (chimps have a cranial capacity of about cc; gorillas 540 cc) except one late australopithecine (A. rudolfensis) that evolved a larger brain Plio-pleistocene australopithecines (3.0 to 1.0 mya) one type of hominin, of two or maybe more general types australopithecines all shared a peculiar heavy back-teeth grinding adaptation, probably for hard seeds like grasses large molars (and premolars) reduced canines zygomatic arches leave space for large temporal muscles zygomatic arches are sturdy for attaching strong masseter muscles fairly prognathic face probably several different lineages all went extinct, unless one led to humans Some examples of australopithecines: Australopithecus africanus ( mya) both South Africa and East Africa enough fossils known that we can say a bit more about this species than others, such as: still have marked sexual dimorphism in body size even though their canines are reduced, probably to facilitate grinding
2 Intro to Biological Anthro F 2011 / Owen: World full of Plio-pleistocene hominins p. 2 this means that males no longer had much larger canines than females but the body size difference suggests that there was still lots of male-male competition, so they were not monogamous growth rings in tooth enamel suggest short, rapid juvenile development similar to chimps, not humans suggests that behavioral complexity and learning were more like chimps than like humans fits with chimp-like brain size famous example, the first specimen found: the Taung child Australopithecus garhi (2.5 mya) recently discovered, still not many fossils basically, just another australopithecine, but a particularly strong chewer larger molars and premolars sagittal crest: attachment of big temporal muscles that meet at the top of the head but surprise!: several animal bones found nearby have cutmarks from flaked stone tools! the stone tools themselves were not found with the fossils but some were found at the nearby site of Gona, which dates to the same time: 2.5 mya no suitable stone is available near the fossil site so the material or finished tools must have been brought to the site by someone making flaked stone tools and transporting them is beyond anything observed in chimps did A. garhi make the tools? if so, A. garhi would have been smarter than its brain size suggests if so, it might be a candidate for our ancestor but if so, then the heavy chewing adaptation must have developed in our lineage, then disappeared again or did a descendant of Kenyanthropus, yet undiscovered, make the tools? if so, no need to imagine that chewing developed and then declined again in our lineage because Kenyanthropus did not have the massive chewing features of australopithecines but we don t have fossils to show that Kenyanthropus left any descendents maybe some other unknown hominin, still undiscovered maybe ancestors of the bigger-brained, later A. rudolfensis? As of last year (2010), we know of even earlier cutmarks from Dikka at 3.4 mya contemporary with Kenyanthropus and A. afarensis so the cutmarked animal bones found with A. garhi are no longer so surprising but we still don t know which hominin(s) made them Australopithecus rudolfensis ( mya) originally called Homo rudolfensis not too different from other austrolopithecines
3 Intro to Biological Anthro F 2011 / Owen: World full of Plio-pleistocene hominins p. 3 short, fast juvenile development, like other australopithecines But: considerably larger brain 775 cc about 75% bigger than 450 cc of A. garhi slightly more human-like dentition somewhat small molars for an australopithecine thinner enamel on molars than most australopithecines more parabolic dental arcade somewhat reduced chewing muscles could brainy A. rudolfensis be our ancestor? Australopithecus habilis ( mya) originally called Homo habilis not too different from other australopithecines short, fast juvenile development, like other australopithecines slightly larger brain than most australopithecines, but not much 500 cc about 10% bigger than 450 cc of A. garhi But: considerably more human-like teeth and cranium shape more human-like dentition: significantly smaller teeth in general thinner enamel on molars than other australopithecines more parabolic dental arcade considerably reduced chewing muscles more human-like cranium shape and features, except for brain size smaller, lighter face less prognathic rounder braincase less chunky base of cranium could human-looking A. habilis be our ancestor? Australopithecus sediba (between 1.95 and 1.8 mya, span unknown yet) discovery just announced in 2010 small, chimp-sized brain less prognathic, lighter dentition and jaws than other australopithecines that is, more Homo-like face, jaws, and teeth body like other australopithecines except for some Homo-like features: longer legs, so they were tall for australopithecines (4 ½ feet) feet more specialized for bipedalism but still retains australopithecine-like long arms interpretation is still being debated could A. sediba, with the most human-like teeth and bipedalism of any australopithecine, be our ancestor? Plio-pleistocene paranthropines (species of Paranthropus) (2.5 to 1.0 mya) in general
4 Intro to Biological Anthro F 2011 / Owen: World full of Plio-pleistocene hominins p. 4 very like australopithecines from the neck down small, bipedal bodies adapted for extremely heaving chewing on the back teeth, even more so than australopithecines huge molars very reduced canines zygomatic arches leave space for huge temporal muscles zygomatic arches very heavy for attaching strong masseter muscles massive mandible tooth wear suggests eating hard seeds or nuts probably two or more lineages of extreme chewers one with very prognathic faces one with fairly vertical faces all extinct by 1.0 mya clearly relatives, but not our ancestors Paranthropus aethiopicus (2.5 mya) the earliest of the known Paranthropus species yet the most extreme chewer of all of them Paranthropus robustus ( mya: relatively late) wear on animal bones found with P. robustus suggests that they used large splinters of animal bone to dig into anthills Paranthropus boisei ( mya) fairly vertical face, like P. robustus versus very prognathic face of P. aethiopicus Possible descendent(s) of Kenyanthropus no fossil evidence of them descendents of Kenyanthropus would have resembled australopithecines but without the heavy chewing adaptation that is, with smaller molars, smaller temporal muscles, etc. and with Kenyanthropus s more vertical, human-like face this would make Kenyanthropus a logical ancestor for humans leaving australopithecines as a side branch that specialized on seeds, then went extinct Kenyanthropus could be the maker of the stone tool cutmarks from Dikka at 3.4 mya the hypothetical descendents of Kenyanthropus could be the makers of the stone tool cutmarks found with A. garhi around 2.5 mya, rather than the small-brained A. garhi only more fossils will resolve this The phylogeny is uncertain many different phylogenies are possible, none clearly the best were our ancestors australopithecines? Kenyanthropus? maybe Kenyanthropus via A. rudolfensis, but not the earlier australopithecines?
5 Intro to Biological Anthro F 2011 / Owen: World full of Plio-pleistocene hominins p. 5 was Sahelanthropus in our lineage, or did it lead to gorillas, or did it go extinct? Overall pattern of hominin evolution 7-5 mya, maybe slightly earlier: the hominin (bipedal) lineage split from the lineage leading to chimps bipedalism evolved during this time; evidence is still sketchy mya: good evidence about A. afarensis 3.5 mya: Kenyanthropus, a second hominin contemporary with A. afarensis the first stone tool cutmarks appeared around this time mya: lots of Plio-pleistocene hominins Paranthropus (at least 3 species, up to 2 at one time) extreme chewing adaptations Australopithecus (at least 5 species, up to 2 or 3 at one time) moderately heavy chewing adaptation plus possible descendents of Kenyanthropus least exaggerated chewing plus the first species of the genus Homo around 1.8 mya we ll look at these later Whatever the phylogenetic relationships, the current evidence suggests that our lineage probably evolved from a Plio-pleistocene hominin generally similar to the australopithecines discussed here, that: was bipedal thus terrestrial but continued to spend a fair amount of time in the trees had grinding molars and reduced canines good for a wide range of foods had considerable sexual dimorphism in body size so it probably lived in multi-female, multi-male groups with lots of male-male competition unless the reduced sexual dimorphism of canines in Ardipithecus is a clue to the contrary had a brain comparable in size to a chimp s, or some a bit bigger except the late A. rudolfensis, considerably larger had short, rapid juvenile development, like a chimp s probably made expedient tools of plant material, bone, etc. simple stone tools evidently ate some meat, given the cutmarks on animal bones maybe hunted, similarly to chimps
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