Rate of Tooth Replacement in the Nurse Shark, Ginglymostoma cirratum

Luer, Carl A.; Blum, Patricia; Gilbert, Perry W.

doi:10.2307/1445834

Cited by 51 publications

(40 citation statements)

References 9 publications

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“…every 9-12 days in the adult Leopard shark (Triakis semifasciata) [23]. This replacement rate appears more rapid during ontogeny and varies among species [24], depending on age, diet and seasonal shifts [23].…”

Section: Chondrichthyans (Sharks Rays and Their Relatives)mentioning

confidence: 99%

Evolution and developmental diversity of tooth regeneration

Tucker

Fraser

2014

Seminars in Cell & Developmental Biology

123

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a b s t r a c tThis review considers the diversity observed during both the development and evolution of tooth replacement throughout the vertebrates in a phylogenetic framework from basal extant chondrichthyan fish and more derived teleost fish to mammals. We illustrate the conservation of the tooth regeneration process among vertebrate clades, where tooth regeneration refers to multiple tooth successors formed de novo for each tooth position in the jaws from a common set of retained dental progenitor cells. We discuss the conserved genetic mechanisms that might be modified to promote morphological diversity in replacement dentitions. We review current research and recent progress in this field during the last decade that have promoted our understanding of tooth diversity in an evolutionary developmental context, and show how tooth replacement and dental regeneration have impacted the evolution of the tooth-jaw module in vertebrates.

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Section: Chondrichthyans (Sharks Rays and Their Relatives)mentioning

confidence: 99%

Evolution and developmental diversity of tooth regeneration

Tucker

Fraser

2014

Seminars in Cell & Developmental Biology

123

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“…These strategies rely upon a number of derived anatomical features, including a segmented and calcified notochordal sheath with calcified cartilage vertebrae for faster swimming, modification of pelvic and pectoral fins and their articulation for greater maneuverability, and modifications of the jaw suspensorium (Moss, 1972Maisey, 1980Maisey, , 1986. Furthermore, many neoselachians also possess sharp cutting and gouging teeth that are shed rapidly and replaced continuously throughout life (Moss, 1967;Luer et al, 1990). This is in contrast to the multicuspid clutching and grasping teeth of most stem neoselachians which, in the case of some cladodont sharks, were retained beneath the skin of the outer jaw margin, rather than shed, following replacement (Williams, 1990(Williams, , 2001.…”

Section: Enameloid Microstructure As a Preadaptation To Crown Group Nmentioning

confidence: 99%

The homology and phylogeny of chondrichthyan tooth enameloid

Gillis

Donoghue

2006

Journal of Morphology

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A systematic SEM survey of tooth microstructure in (primarily) fossil taxa spanning chondrichthyan phylogeny demonstrates the presence of a superficial cap of single crystallite enameloid (SCE) on the teeth of several basal elasmobranchs, as well as on the tooth plates of Helodus (a basal holocephalan). This suggests that the epithelial-mesenchymal interactions required for the development of enameloid during odontogenesis are plesiomorphic in chondrichthyans, and most likely in toothed gnathostomes, and provides phylogenetic support for the homology of chondrichthyan and actinopterygian enameloid. Along the neoselachian stem, we see a crownward progression, possibly modulated by heterochrony, from a monolayer of SCE lacking microstructural differentiation to the complex triple-layered tooth enameloid fabric of neoselachians. Finally, the occurrence of fully-differentiated neoselachian enameloid microstructure (including compression-resistant tangle fibered enameloid and bending-resistant parallel fibered enameloid) in Chlamydoselachus anguineus, a basal Squalean with teeth that are functionally ''cladodont,'' is evidence that triple-layered enameloid microstructure was a preadaption to the cutting and gouging function of many neoselachian teeth, and thus may have played an integral role in the Mesozoic radiation of the neoselachian crown group.

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“…Serial tooth replacement also allows for the production of larger teeth as an animal grows (Moss, 1972), as well as changes in tooth morphology through ontogeny or even seasonally (Kajiura and Tricas, 1996). The rate of tooth replacement varies among species, with previous studies demonstrating that teeth can move one series in the labial direction every 8 to 28 days (Boyne, 1970;Frazzetta, 1994;Luer et al, 1990;Moss, 1967;Reif et al, 1978).…”

Section: Introductionmentioning

confidence: 99%

Functional implications of ontogenetic and sexual dimorphic dentition in the eastern shovelnose ray Aptychotrema rostrata (Shaw & Nodder, 1794)

Gutteridge

Bennett

2013

Journal of Experimental Biology

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Unlike other elasmobranchs, batoids exhibit sexually dimorphic dentition. The functional implications of such dentition, however, remain understudied. For the present study, ontogenetic and sexual dimorphism in tooth and jaw structure, together with the functional implications of this dimorphism, were determined in the eastern shovelnose ray, Aptychotrema rostrata. Sexually dimorphic dentition and jaw structure was first observed in sub-adult age classes, with males developing a pronounced lower jaw at the symphysis. Monognathic heterodonty was prominent in mature males, with teeth in the symphyseal region developing significantly greater heights and sharpness ratios in comparison to females. Ex vivo mechanical grip strength tests were used to determine simulated bite-grip tenacity. The mean peak pull-out forces required to withdraw a section of a dissected pectoral fin from between jaws closed with a constant occlusal force was highest for mature males, intermediate for mature females and lowest for immature females and males. Although the species exhibits ontogenetic variations in diet, these were unrelated to sex. Rather, the larger and highly cuspidate teeth of mature males increased the bite-grip tenacity, which likely aids in copulation.

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Rate of Tooth Replacement in the Nurse Shark, Ginglymostoma cirratum

Cited by 51 publications

References 9 publications

Evolution and developmental diversity of tooth regeneration

Evolution and developmental diversity of tooth regeneration

The homology and phylogeny of chondrichthyan tooth enameloid

Functional implications of ontogenetic and sexual dimorphic dentition in the eastern shovelnose ray Aptychotrema rostrata (Shaw & Nodder, 1794)

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