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Reanalysis of the Lukeino molar (KNM‐LU 335)
Author(s) -
Ungar Peter S.,
Walker Alan,
Coffing Katherine
Publication year - 1994
Publication title -
american journal of physical anthropology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.146
H-Index - 119
eISSN - 1096-8644
pISSN - 0002-9483
DOI - 10.1002/ajpa.1330940202
Subject(s) - molar , homo sapiens , troglodytes , crown (dentistry) , human evolution , mandibular molar , evolutionary biology , biology , zoology , geography , orthodontics , paleontology , archaeology , medicine
This paper details a reanalysis of KNM‐LU 335, a hominoid mandibular first molar dated to about 6 Ma from the Lukeino Formation, Kenya. Researchers have argued that this molar closely resembles those of modern chimpanzees and may approximate the ancestral morphotype of humans and chimpanzees. The investigation presented here describes a morphometric study of the Lukeino molar and M 1 S of Homo sapiens, Pan troglodytes , and early australopithecines. Results indicate that KNM‐LU 335 differs from both human and chimpanzee M 1 S in relative distances (measured in three dimensions) between crown fissure termini. Further, the Lukeino molar shares with early australopithecines a pronounced flaring of the buccal surface of the crown not seen for either modern sample. Results of this study do not exclude KNM‐LU 335 as a potential ancestral morphotype for Pan and Homo but provide no evidence that this morphotype resembled modern chimpanzees. © 1994 Wiley‐Liss, Inc.