New fossils of Australopithecus anamensis from Kanapoi, West Turkana, Kenya (2003-2008)
Identifieur interne : 002E49 ( Main/Exploration ); précédent : 002E48; suivant : 002E50New fossils of Australopithecus anamensis from Kanapoi, West Turkana, Kenya (2003-2008)
Auteurs : C. V. Ward [États-Unis] ; F. K. Manthi [Kenya] ; J. M. Plavcan [États-Unis]Source :
- Journal of human evolution [ 0047-2484 ] ; 2013.
Descripteurs français
- Pascal (Inist)
- Wicri :
- geographic : Kenya.
English descriptors
Abstract
Renewed fieldwork from 2003 through 2008 at the Australopithecus anamensis type-site of Kanapoi, Kenya, yielded nine new fossils attributable to this species. These fossils all date to between 4.195 and 4.108 million years ago. Most were recovered from the lower fluvial sequence at the site, with one from the lacustrine sequence deltaic sands that overlie the lower fluvial deposits but are still below the Kanapoi Tuff. The new specimens include a partial edentulous mandible, partial maxillary dentition, two partial mandibular dentitions, and five isolated teeth. The new Kanapoi hominin fossils increase the sample known from the earliest Australopithecus, and provide new insights into morphology within this taxon. They support the distinctiveness of the early A. anamensis fossils relative to earlier hominins and to the later Australopithecus afarensis. The new fossils do not appreciably extend the range of observed variation in A. anamensis from Kanapoi, with the exception of some slightly larger molars, and a canine tooth root that is the largest in the hominin fossil record. All of the Kanapoi hominins share a distinctive morphology of the canine-premolar complex, typical early hominin low canine crowns but with mesiodistally longer honing teeth than seen in A. afarensis, and large, probably dimorphic, canine tooth roots. The new Kanapoi specimens support the observation that canine crown height, morphology, root size and dimorphism were not altered from a primitive ape-like condition as part of a single event in human evolution, and that there may have been an adaptive difference in canine function between A. anamensis and A. afarensis.
Affiliations:
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Box 40658</s1><s2>Nairobi</s2><s3>KEN</s3><sZ>2 aut.</sZ></inist:fA14><country>Kenya</country><wicri:noRegion>Nairobi</wicri:noRegion></affiliation></author><author><name sortKey="Plavcan, J M" sort="Plavcan, J M" uniqKey="Plavcan J" first="J. M." last="Plavcan">J. M. 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Plavcan</name><affiliation wicri:level="2"><inist:fA14 i1="03"><s1>Department of Anthropology, 330 Old Main, University of Arkansas</s1><s2>Fayetteville, AR 72701</s2><s3>USA</s3><sZ>3 aut.</sZ></inist:fA14><country>États-Unis</country><placeName><region type="state">Arkansas</region></placeName></affiliation></author></analytic><series><title level="j" type="main">Journal of human evolution</title><title level="j" type="abbreviated">J. hum. evol.</title><idno type="ISSN">0047-2484</idno><imprint><date when="2013">2013</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Journal of human evolution</title><title level="j" type="abbreviated">J. hum. evol.</title><idno type="ISSN">0047-2484</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Anthropology</term><term>Australopithecus anamensis</term><term>Human palaeontology</term><term>Human remain</term><term>Kenya</term><term>Tooth</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Kenya</term><term>Australopithecus anamensis</term><term>Reste humain</term><term>Dent</term><term>Anthropologie</term><term>Paléontologie humaine</term><term>Kanapoi</term></keywords><keywords scheme="Wicri" type="geographic" xml:lang="fr"><term>Kenya</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Renewed fieldwork from 2003 through 2008 at the Australopithecus anamensis type-site of Kanapoi, Kenya, yielded nine new fossils attributable to this species. These fossils all date to between 4.195 and 4.108 million years ago. Most were recovered from the lower fluvial sequence at the site, with one from the lacustrine sequence deltaic sands that overlie the lower fluvial deposits but are still below the Kanapoi Tuff. The new specimens include a partial edentulous mandible, partial maxillary dentition, two partial mandibular dentitions, and five isolated teeth. The new Kanapoi hominin fossils increase the sample known from the earliest Australopithecus, and provide new insights into morphology within this taxon. They support the distinctiveness of the early A. anamensis fossils relative to earlier hominins and to the later Australopithecus afarensis. The new fossils do not appreciably extend the range of observed variation in A. anamensis from Kanapoi, with the exception of some slightly larger molars, and a canine tooth root that is the largest in the hominin fossil record. All of the Kanapoi hominins share a distinctive morphology of the canine-premolar complex, typical early hominin low canine crowns but with mesiodistally longer honing teeth than seen in A. afarensis, and large, probably dimorphic, canine tooth roots. The new Kanapoi specimens support the observation that canine crown height, morphology, root size and dimorphism were not altered from a primitive ape-like condition as part of a single event in human evolution, and that there may have been an adaptive difference in canine function between A. anamensis and A. afarensis.</div></front></TEI><affiliations><list><country><li>Kenya</li><li>États-Unis</li></country><region><li>Arkansas</li><li>Missouri (État)</li></region></list><tree><country name="États-Unis"><region name="Missouri (État)"><name sortKey="Ward, C V" sort="Ward, C V" uniqKey="Ward C" first="C. V." last="Ward">C. V. Ward</name></region><name sortKey="Plavcan, J M" sort="Plavcan, J M" uniqKey="Plavcan J" first="J. M." last="Plavcan">J. M. Plavcan</name></country><country name="Kenya"><noRegion><name sortKey="Manthi, F K" sort="Manthi, F K" uniqKey="Manthi F" first="F. K." last="Manthi">F. K. Manthi</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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