Tracing the ancestry of the great white shark,<i>Carcharodon carcharias</i>, using morphometric analyses of fossil teeth

Nyberg, Kevin G.; Ciampaglio, Charles N.; Wray, Gregory A.

doi:10.1671/0272-4634(2006)26[806:ttaotg]2.0.co;2

Cited by 44 publications

(44 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The presence of serrated cutting edges on Carcharoides totuserratus could be interpreted as a derived character from a taxon without serrations (such as C. catticus). A similar situation is seen between Carcharodon carcharias Linnaeus, 1758 and Cosmopolitodus hastalis (Agassiz, 1843), the latter possibly being the ancestor of the former (Nyberg et al, 2006). Furthermore, it is consistent with the presence of the derived species C. totuserratus exclusively in the Southern Hemisphere during the Oligocene-Miocene, with two records in the Pacific (Fitzgerald, 2004;Suárez et al, 2006) and one in the Atlantic Ocean (Cione and Expósito, 1980).…”

Section: Relative Agesupporting

confidence: 61%

A Late Eocene age proposal for the Loreto Formation (Brunswick Peninsula, southernmost Chile), based on fossil cartilaginous fishes, paleobotany and radiometric evidence

Otero¹,

Torres²,

Roux³

et al. 2012

Andgeo

View full text Add to dashboard Cite

show abstract

Section: Relative Agesupporting

confidence: 61%

A Late Eocene age proposal for the Loreto Formation (Brunswick Peninsula, southernmost Chile), based on fossil cartilaginous fishes, paleobotany and radiometric evidence

Otero¹,

Torres²,

Roux³

et al. 2012

Andgeo

View full text Add to dashboard Cite

show abstract

“…A) The megalodon shark is placed in the genus Carcharocles (Family Otodontidae) (Casier, 1960;Gluckman, 1964;Capetta, 1987;Ward & Bonavia, 2001;Nyberg et al, 2006;Ehret et al, 2009aEhret et al, , 2012Pimiento et al, 2010).…”

Section: Discussionmentioning

confidence: 99%

Record of <em>Carcharocles megalodon</em> in the Eastern Guadalquivir Basin (Upper Miocene, South Spain)

Reolid

Molina

2015

Estud. geol.

View full text Add to dashboard Cite

Tortonian diatomites of the San Felix Quarry (Porcuna), in the Eastern Guadalquivir Basin, have given isolated marine vertebrate remains that include a large shark tooth (123.96 mm from apex to the baseline of the root). The large size of the crown height (92.2 mm), the triangular shape, the broad serrated crown, the convex lingual face and flat labial face, and the robust, thick angled root determine that this specimen corresponds to Carcharocles megalodon. The symmetry with low slant shows it to be an upper anterior tooth. The total length estimated from the tooth crown height is calculated by means of different methods, and comparison is made with Carcharodon carcharias. The final inferred total length of around 11 m classifies this specimen in the upper size range of the known C. megalodon specimens.The palaeogeography of the Guadalquivir Basin close to the North Betic Strait, which connected the Atlantic Ocean to the Mediterranean Sea, favoured the interaction of the cold nutrient-rich Atlantic waters with warmer Mediterranean waters. The presence of diatomites indicates potential upwelling currents in this context, as well as high productivity favouring the presence of large vertebrates such as mysticetid whales, pinnipeds and small sharks (Isurus). These large vertebrates recorded in the Eastern Guadalquivir Basin were potential prey of C. megalodon. Keywords: Carcharocles megalodon; fossil tooth; Guadalquivir Basin; Tortonian. RESUMENLas diatomitas tortonienses de la antigua Cantera de San Félix (Porcuna, Jaén), en el sector oriental de la Cuenca del Guadalquivir, han proporcionado restos aislados de vertebrados marinos entre los que destaca un gran diente de tiburón (123.96 mm desde el ápice hasta la línea basal de la raiz). La altura de la corona (92.2 mm), su forma triangular con bordes aserrados, la presencia de una cara lingual convexa y una labial plana, conjuntamente con la raíz angulosa y robusta, permiten determinar que este diente perteneció a un ejemplar de Carcharocles megalodon. La alta simetría de la pieza, su tamaño y su relación longitud/anchura de la corona permiten afrimar que se trata de un diente superior anterior. La longitud total estimada para este tiburón, es calculada a partir de diferentes métodos basados principalmente en la comparación con el tiburón blanco Carcharodon carcharias. La longitud total inferida finalmente para este ejemplar ronda los 11 m, lo que permite incluir este ejemplar dentro del rango de los ejemplares de C. megalodon de gran tamaño.

show abstract

“…Purdy et al (2001) suggest that I. paucus may be a junior synonym to I. hastalis, and that I. retroflexus may be a nomen dubium. Nyberg et al (2006) cite a growing consensus that I. escheri should be split into two distinct species. The techniques outlined in this study may elucidate these relationships.…”

Section: Discussionmentioning

confidence: 99%

“…Geometric morphometric techniques have been applied to modern and fossil Rhiz oprionodon teeth and were able to distinguish between Rhiz oprionodon and closely related genera, but could not distinguish between species of Rhiz oprionodon (Garry, 2004). Most recently, geometric morphometrics was used to explore the evolutionary origins of modern white sharks Carcharodon carcharias (Nyberg et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

A morphometric approach for addressing tooth-based species delimitation in fossil mako sharks,Isurus(Elasmobranchii: Lamniformes)

Whitenack

Gottfried

2010

Journal of Vertebrate Paleontology

View full text Add to dashboard Cite

ABSTRACT-Morphological studies of fossil and extant shark teeth have typically been qualitative in nature, with resulting taxonomic problems due to the complicated forms of heterodonty exhibited by many sharks. This is apparent in the designation of fossil species assigned to Isurus (Lamniformes), where the status of the putative Neogene fossil species Isurus xiphodon and I. hastalis is solely based upon supposed differences in tooth morphology. Here we apply the geometric morphometric techniques of Procrustes superimposition, resampling-based Goodall's F-test, and canonical variates analysis to extant Isurus teeth, with the goal of assessing whether these quantitative analytical techniques provide a more objective basis for taxonomic decisions than do traditional qualitative morphological descriptions. These quantitative techniques are then applied to I. hastalis and I. xiphodon to examine whether I. xiphodon should be considered a junior synonym of I. hastalis or a separate species. Results show that geometric morphometric techniques can differentiate between the two extant species as well as the two extinct species, supporting I. xiphodon as a valid taxon. We suggest that this type of analysis is applicable for examining tooth-based species delimitations of sharks with both extant and extinct members, and has the potential to be applied to other fossil shark species as well.

show abstract

Tracing the ancestry of the great white shark,Carcharodon carcharias, using morphometric analyses of fossil teeth

Cited by 44 publications

References 13 publications

A Late Eocene age proposal for the Loreto Formation (Brunswick Peninsula, southernmost Chile), based on fossil cartilaginous fishes, paleobotany and radiometric evidence

A Late Eocene age proposal for the Loreto Formation (Brunswick Peninsula, southernmost Chile), based on fossil cartilaginous fishes, paleobotany and radiometric evidence

Record of <em>Carcharocles megalodon</em> in the Eastern Guadalquivir Basin (Upper Miocene, South Spain)

A morphometric approach for addressing tooth-based species delimitation in fossil mako sharks,Isurus(Elasmobranchii: Lamniformes)

Contact Info

Product

Resources

About