Talonid crests expression at the enamel–dentine junction of hominin lower permanent and deciduous molars

Martinón‐Torres, María; Pinillos, Marina Martínez de; Skinner, Matthew M.; Martín‐Francés, Laura; Gracia-Téllez, Ana; Martı́nez, Ignacio; Arsuaga, Juan Luís; Castro, José Marı́a Bermúdez de

doi:10.1016/j.crpv.2013.12.002

Cited by 33 publications

(30 citation statements)

References 36 publications

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“…The EDJ of the LM3 specimen NG9107.2 is more complex, including two short crests running from the lingual marginal ridge towards the centre of the occlusal basin and, similarly to NG92 D6 ZE 57s/d 76 (LM2/3) and NG0802.2 (LM2/3), also multiple ridges arising from the entoconid (type 4; Martinón‐Torres et al, ).…”

Section: Resultsmentioning

confidence: 91%

“…In this complex scenario, the inner analysis of the H. erectus permanent molar teeth from the late Lower‐Early Middle Pleistocene Kabuh Formation of the Sangiran Dome has revealed a set of morphostructural characteristics distinct from those reported so far for some roughly penecontemporaneous African assemblages (Bailey et al, ; Zanolli and Mazurier, ; Martinón‐Torres et al, ; Zanolli et al, ) as well from those of Neanderthals (e.g., Macchiarelli et al, ; Olejnickzak et al, 2008a), but otherwise relatively common in recent human populations (e.g., Bailey et al, ; Zanolli and Mazurier, ). This is in agreement with previous conclusions based on the study of their outer crown morphology (Zanolli, ), and is also consistent with the evidence for a relatively “modern‐like” signature revealed by the microtomographic‐based analysis of two deciduous molars collected near the village of Pucung, in the Sangiran area, likely coming from the same chronostratigraphical context (Zanolli et al, ).…”

Section: Discussionmentioning

confidence: 91%

“…On the contrary, the LM2/3 crown NG92.3 exhibits no expression of this trait, but only a faint accessory ridge located mesially to the entoconid. A different kind of talonid crest pattern is expressed by the LM2/3 specimen NG92 D6 ZE 57s/d 76, with the presence of a crest positioned distally to the distal trigonid crest, which runs briefly from the metaconid in distobuccal direction (type 6; Martinón‐Torres et al, ).…”

Section: Resultsmentioning

confidence: 99%

“…The presence and degree of expression at the enamel‐dentine junction (EDJ) level of nonmetric features have been scored following Ortiz et al () for the Carabelli trait, Skinner et al () for the accessory cusps and protostylid, Bailey et al () and Martínez de Pinillos et al () for the mid‐trigonid crest pattern (see also Macchiarelli et al, ), and Martinón‐Torres et al () for the talonid crest.…”

Section: Methodsmentioning

confidence: 99%

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Molar crown inner structural organization in Javanese Homo erectus

Zanolli

2014

American J Phys Anthropol

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This contribution investigates the inner organizational pattern (tooth tissue proportions and enamel-dentine junction morphology) of seven Homo erectus permanent molar crowns from the late Lower-early Middle Pleistocene Kabuh Formation of the Sangiran Dome (Central Java, Indonesia). The previous study of their external characteristics confirmed the degree of time-related structural reduction occurred in Javanese H. erectus, and also revealed a combination of nonmetric features which are rare in the Lower and early Middle Pleistocene dental record, but more frequently found in recent humans. In accordance with their outer occlusal morphology, the specimens exhibit a set of derived internal features, such as thick to hyperthick enamel, an incomplete expression of the crest patterns at the enamel-dentine junction (EDJ) level, a sharp EDJ topography. As a whole, these features differ from those expressed in some penecontemporaneous specimens/samples representing African H. erectus/ergaster and H. heidelbergensis, as well as in Neanderthals, but occur in recent human populations. Further research in virtual dental paleoanthropology to be developed at macroregional scale would clarify the polarity and intensity of the intermittent exchanges between continental and insular Southeast Asia around the Lower to Middle Pleistocene boundary, as well as should shed light on the still poorly understood longitudinal evolutionary dynamics across continental Asia.

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Section: Resultsmentioning

confidence: 91%

Section: Discussionmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Molar crown inner structural organization in Javanese Homo erectus

Zanolli

2014

American J Phys Anthropol

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“…Despite sometimes being passed over in favor of the permanent dentition there has been a resurgence of interest in the deciduous dentition, especially in the context of the human fossil record, (e.g. Zanolli et al, ; Benazzi et al, , , ; Bailey et al, ,b; Martinón‐Torres et al, ; Harvati et al, ). Many of these studies reflect recent technological advances (e.g.…”

Section: Measured Crown Areas (Mm2) Of Lower Dm2 and M1 In Matched Inmentioning

confidence: 99%

Allometry, merism, and tooth shape of the lower second deciduous molar and first permanent molar

Bailey

Benazzi

Buti

et al. 2015

American J Phys Anthropol

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Deciduous Dentition of Fossil Hominins

Bailey

2017

Encyclopedia of Life Sciences

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The deciduous dentition is the first of two successive sets of teeth in humans. It consists of 20 teeth that are shed and replaced by the permanent teeth, of which there are 32. The most significant differences in the teeth of fossil hominins and great apes are the reduction of canine size, the change in canine shape and the increased complexity of the deciduous lower first molar. At about 2.5 million years ago, one hominin lineage – Paranthropus – continued to increase size and complexity of molars, and reduce canine and incisor size, while the lineage leading to our species Homo sapiens underwent dental reduction and simplification. Compared to earlier hominins, the deciduous teeth of recent humans are greatly reduced in size and complexity. However, the range of size and morphological variation among geographic populations is very wide, especially for deciduous first molars. Key Concepts Hominin deciduous teeth differ from those of great apes primarily in the size and shape of the upper and lower canines and shape of lower first molar. Hominin deciduous incisors are smaller than those of great apes and early hominin upper incisors are more heteromorphic (greater differences in size between lateral and central incisors). Hominin deciduous canines are shorter, smaller and less pointed than those of great apes. Hominin deciduous canines are more diamond shaped and less conical than those of great apes. Hominin deciduous lower first molars are nonsectorial and have more cusps than those of great apes. Hominin deciduous molars are larger and may be morphologically more complex than those of great apes. The genus Homo is characterised by incisor expansion, further canine diminution and molar reduction. Neanderthals can be statistically distinguished from Homo sapiens in the shape and cusp size of deciduous molars. Recent humans are highly variable compared to their fossil relatives, but tend to have even smaller and more simplified canines and postcanine teeth.

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Talonid crests expression at the enamel–dentine junction of hominin lower permanent and deciduous molars

Cited by 33 publications

References 36 publications

Molar crown inner structural organization in Javanese Homo erectus

Molar crown inner structural organization in Javanese Homo erectus

Allometry, merism, and tooth shape of the lower second deciduous molar and first permanent molar

Deciduous Dentition of Fossil Hominins

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