The size of the megatooth shark, Otodus megalodon (Lamniformes: Otodontidae), revisited

@article{Shimada2019TheSO,
  title={The size of the megatooth shark, Otodus megalodon (Lamniformes: Otodontidae), revisited},
  author={Kenshu Shimada},
  journal={Historical Biology},
  year={2019},
  volume={33},
  pages={904 - 911}
}
  • K. Shimada
  • Published 30 September 2019
  • Environmental Science, Geography
  • Historical Biology
ABSTRACT Otodus megalodon (Lamniformes: Otodontidae) is a gigantic late Neogene shark that lived nearly worldwide in tropical-temperate regions. Its gigantic teeth have captivated imaginations of the scientific community and general public alike, where the most commonly cited maximum size range of O. megalodon in scientific literature is 18–20 m in total length (TL). In this study, I reexamined the ontogenetic development of teeth and the quantitative relationships between TL and the crown… 

Body length estimation of Neogene macrophagous lamniform sharks (Carcharodon and Otodus) derived from associated fossil dentitions

The megatooth shark, Otodus megalodon, is widely accepted as the largest macrophagous shark that ever lived; and yet, despite over a century of research, its size is still debated. The great white

Body forms of extant lamniform sharks (Elasmobranchii: Lamniformes), and comments on the morphology of the extinct megatooth shark, Otodus megalodon, and the evolution of lamniform thermophysiology

The reality is that there are presently no scientific means to support or refute the accuracy of any of the previously published body forms of O. megalodon, and there is no relationship between thermophysiology and body form in lamniforms.

Body, jaw, and dentition lengths of macrophagous lamniform sharks, and body size evolution in Lamniformes with special reference to ‘off-the-scale’ gigantism of the megatooth shark, Otodus megalodon

It is contended that ovoviviparous reproduction involving intrauterine cannibalism, a possible synapomorphy of Lamniformes, to be another plausible driver for the evolution of endothermy achieved by certain lamniform taxa.

Revisiting body size trends and nursery areas of the Neogene megatooth shark, Otodus megalodon (Lamniformes: Otodontidae), reveals Bergmann’s rule possibly enhanced its gigantism in cooler waters

The late Neogene megatooth shark, Otodus megalodon , is known mainly from its gigantic teeth and possibly reached 18–20 m in total length (TL). We re-examine the previously proposed body size trends

Ontogenetic growth pattern of the extinct megatooth shark Otodus megalodon—implications for its reproductive biology, development, and life expectancy

Examination of incremental growth bands in fossil vertebrae of a 9.2-m-long individual O. megalodon reveals that the shark was born large, 2 m in length, and died at age 46, suggesting that the species had a lifespan of at least 88–100 years with an average growth rate of about 16 cm/yr at least for the first 46 years.

Use of nursery areas by the extinct megatooth shark Otodus megalodon (Chondrichthyes: Lamniformes)

These results reveal, for the first time, that nursery areas were commonly used by O. megalodon over large temporal and spatial scales, reducing early mortality and playing a key role in maintaining viable adult populations.

Body dimensions of the extinct giant shark Otodus megalodon: a 2D reconstruction

Body dimensions based on anatomical measurements of five ecologically and physiologically similar extant lamniforms suggest that the extinct giant shark †O.

Morphology and paleobiology of the Late Cretaceous large-sized shark Cretodus crassidens (Dixon, 1850) (Neoselachii; Lamniformes)

Abstract. The definition of the Cretaceous shark genus Cretodus Sokolov, 1965 is primarily based on isolated teeth. This genus includes five species. Among these, Cretodus houghtonorum Shimada and

Biomechanical insights into the dentition of megatooth sharks (Lamniformes: Otodontidae)

It is proposed that the evolution of gigantism in extinct otodontid sharks was paralleled by a series of drastic modifications in their dentition, and that this pattern most likely emerged as a non-functional by-product of heterochronic processes driven by selection towards larger body sizes.

The extinct shark Otodus megalodon was a transoceanic superpredator: Inferences from 3D modeling

Although shark teeth are abundant in the fossil record, their bodies are rarely preserved. Thus, our understanding of the anatomy of the extinct Otodus megalodon remains rudimentary. We used an

References

SHOWING 1-10 OF 62 REFERENCES

A new elusive otodontid shark (Lamniformes: Otodontidae) from the lower Miocene, and comments on the taxonomy of otodontid genera, including the ‘megatoothed’ clade

A new large otodontid lamniform shark, Megalolamna paradoxodon gen. nov., chronostratigraphically restricted to the early Miocene, is described based on isolated teeth found from five globally distributed localities.

The Early Pliocene extinction of the mega-toothed shark Otodus megalodon: a view from the eastern North Pacific

All records of Otodus megalodon from post-Messinian marine strata from western North America are reviewed and a published dataset is reevaluated, thoroughly vetting each occurrence and justifying the geochronologic age of each, as well as excluding several dubious records.

The transition between Carcharocles chubutensis and Carcharocles megalodon (Otodontidae, Chondrichthyes): lateral cusplet loss through time

This study helps to elucidate the timing of lateral cusplet loss in Carcharocles locally, and the rationale for this prolonged evolutionary transition remains unclear.

When Did Carcharocles megalodon Become Extinct? A New Analysis of the Fossil Record

The study of the time of extinction of C. megalodon provides the basis to improve the understanding of the responses of marine species to the removal of apex predators, presenting a deep-time perspective for the conservation of modern ecosystems.

The relationship between the tooth size and total body length in the goblin shark, Mitsukurina owstoni (Lamniformes: Mitsukurinidae)

The results suggest that the CH for most teeth can be used to predict the TL, where an increase in the CH of each tooth through replacement is proportional to the increase in TL.

Body-size trends of the extinct giant shark Carcharocles megalodon: a deep-time perspective on marine apex predators

The results suggest that (1) a selective pressure in predatory sharks for consuming a broader range of prey may favor larger individuals and produce left-skewed distributions on a geologic time scale; (2) body-size variations in cosmopolitan apex marine predators may depend on their interactions with geographically discrete communities; and (3) the inherent characteristics of shark species can produce stable sizes overGeologic time, regardless of the size trends of their lineages.

Registro de Carcharocles megalodon en el sector oriental de la Cuenca del Guadalquivir (Mioceno superior, Sur de España)

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

Carcharodon megalodon from the Upper Miocene of Denmark, with comments on elasmobranch tooth enameloid: coronoi:n

https://doi.org/10.37570/bgsd-1983-32-01 C. megalodon, not previously known from deposits in Denmark, is recorded from a large, but imperfect tooth derived from the marine clay exposed at the type

Giant-toothed white sharks and cetacean trophic interaction from the Pliocene Caribbean Paraguaná Formation

The role of the extinct giant-toothed white sharkCarcharodon megalodon (Agassiz) in the Caribbean Neogene is discussed based on new evidence of predation on cetaceans from the Lower Pliocene
...