Tooth Succession in the Smooth Dogfish, Mustelus Canis

Ifft, John D.; Zinn, Donald Joseph

doi:10.2307/1538156

Cited by 16 publications

(6 citation statements)

References 3 publications

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“…Applegate (1965) found that in Odontaspis taurus (Odontaspididae) the size of the teeth was in approximate linear correlation with the size of the shark. The rate of tooth development and shedding in scyliorhinids has not been determined but evidence from species of other families (Ifft and Zinn 1948;Moss 1967) points to rapid replacement rates, especially for immature sharks.…”

Section: Teethmentioning

confidence: 99%

A revision of the catsharks, family Scyliorhinidae /

Springer¹

1979

109

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The major responsibilities of the National Marine Fisheries Service (NMFS) are to monitor and assess the abundance and geographic distribution of fishery resources, to understand and predict fluctuations in the quantity and distribution of these resources, and toestablish levels for optimum use of the resources. NMFS is also charged with the development and implementation of policies for managing national fishing grounds, development and enforcement of domestic fisheries regulations, surveillance of foreign fishing off United States coasial waters, and the development and enforcement of international fishery agreements and policies. NMFS also assists the fishing industry through marketing service and economic analysis programs, and mortgage insurance and vessel construction subsidies. It collects, analyzes, and publishes statistics on various phases of the industry.The NOAA Technical Report NMFS Circular series continues a series that has been in existence since 1941. The Circulars are technical publications of general interest intended to aid conservation and management. Publications that review in considerable detail and at a high technical level certain broad areas of research appear in this series. Technical papers originating in economics studies and from management investigations appear in the Circular series.NOAA Technical Report NMFS Circulars are available free in limited numbers to governmental agencies, both Federal and State. They are also available in exchange for other scientific and technical publications in the marine sciences. Individual copies may be obtained (unless otherwise noted) from

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Section: Teethmentioning

confidence: 99%

A revision of the catsharks, family Scyliorhinidae /

Springer¹

1979

109

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“…Modern sharks form a monophyletic group with rays and skates (Neoselachii sensu Compagno, ; Elasmobranchii sensu Maisey, ), with a fossil record extending back into the Early Permian (295 mya; Ivanov, ) and have developed a wide range of lifestyles and feeding strategies during their evolutionary history (Compagno, ; Wilga et al ). It is apparent that the continuous tooth replacement [polyphyodont dentition (Ifft & Zinn, ; Cappetta, )] and the development of a variety of different tooth morphologies (Cappetta, ) are key features that allowed modern sharks to occupy a range of ecological roles, from ectoparasites like the cookie cutter shark Isistius brasiliensis (Papastamatiou et al ) to apex predators such as the great white shark Carcharodon carcharias (Heupel et al ). The morphology of shark teeth is thought to be related to their function, i.e.…”

Section: Introductionmentioning

confidence: 99%

Evolutionary trajectories of tooth histology patterns in modern sharks (Chondrichthyes, Elasmobranchii)

Jambura

Türtscher

Kindlimann³

et al. 2019

Journal of Anatomy

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During their evolutionary history, modern sharks developed different tooth mineralization patterns that resulted in very distinct histological patterns of the tooth crown (histotypes). To date, three different tooth histotypes have been distinguished: (i) orthodont teeth, which have a central hollow pulp cavity in the crown, encapsulated by a prominent layer of dentine (orthodentine); (ii) pseudoosteodont teeth, which have their pulp cavities secondarily replaced by a dentinal core of porous dentine (osteodentine), encased by orthodentine; and (iii) osteodont teeth, which lack orthodentine and the whole tooth crown of which consists of osteodentine. The aim of the present study was to trace evolutionary trends of tooth mineralization patterns in modern sharks and to find evidence for the presence of phylogenetic or functional signals. High resolution micro-computed tomography images were generated for the teeth of members of all nine extant shark orders and the putative stem group †Synechodontiformes, represented here by three taxa, to examine the tooth histology non-destructively. Pseudoosteodonty is the predominant state among modern sharks and represents unambiguously the plesiomorphic condition. Orthodonty evolved several times independently in modern sharks, while the osteodont tooth histotype is only developed in lamniform sharks. The two shark orders Heterodontiformes and Pristiophoriformes showed highly modified tooth histologies, with Pristiophorus exhibiting a histology only known from batomorphs (i.e. rays and skates), and Heterodontus showing a histological difference between anterior and posterior teeth, indicating a link between its tooth morphology, histology and durophagous lifestyle. The tooth histotype concept has proven to be a useful tool to reflect links between histology, function and its taxonomic value for distinct taxa; however, a high degree of variation, especially in the pseudoosteodont tooth histotype, demonstrates that the current histotype concept is too simplistic to fully resolve these relationships. The vascularization pattern of the dentine might offer new future research pathways for better understanding functional and phylogenetic signals in the tooth histology of modern sharks.

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“…squaliform sharks) [ 4 , 7 ]. Teeth are initially formed within the dental lamina on the lingual side of the jaws and move toward the functional position on the jaw margin in a conveyor belt-like fashion [ 5 , 6 , 8 ]. The teeth on the jaw margin (situated labially) are in an erect position suitable for feeding, while those situated on the lingual face of the jaw cartilage are less developed and are inverted (with the tip of the tooth directed lingually towards the dental lamina) or in a semi-erect position.…”

Section: Introductionmentioning

confidence: 99%

Tooth mineralization and histology patterns in extinct and extant snaggletooth sharks, Hemipristis (Carcharhiniformes, Hemigaleidae)—Evolutionary significance or ecological adaptation?

et al. 2018

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Shark jaws exhibit teeth that are arranged into distinct series and files and display great diversities in shapes and structures, which not only is related to their function (grasping, cutting, crushing) during feeding, but also bear a strong phylogenetic signal. So far, most research on the relationship between shark teeth and feeding ecology and systematics focused on the external tooth morphology only. Although the tooth histology of sharks has been examined since the early 19th century, its functional and systematic implications are still ambiguous. Shark teeth normally consist of either a porous, cellular dentine, osteodentine (in lamniform sharks and some batoids) or a dense layer of orthodentine (known from different sharks). Sharks of the order Carcharhiniformes, comprising ca. 60% of all extant shark species, are known to have orthodont teeth, with a single exception—the snaggletooth shark, Hemipristis elongata. High resolution micro-CT images of jaws and teeth from selected carcharhiniform sharks (including extant and fossil snaggletooth sharks) and tooth sections of teeth of Hemipristis, other carcharhiniform and lamniform sharks, have revealed that (1) Hemipristis is indeed the only carcharhiniform shark filling its pulp cavity with osteodentine in addition to orthodentine, (2) the tooth histology of Hemipristis elongata differs from the osteodont histotype, which evolved in lamniform sharks and conversely represents a modified orthodonty, and (3) this modified orthodonty was already present in extinct Hemipristis species but the mineralization sequence has changed over time. Our results clearly show the presence of a third tooth histotype—the pseudoosteodont histotype, which is present in Hemipristis. The unique tooth histology of lamniform sharks might provide a phylogenetic signal for this group, but more research is necessary to understand the phylogenetic importance of tooth histology in sharks in general.

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Tooth Succession in the Smooth Dogfish, Mustelus Canis

Cited by 16 publications

References 3 publications

A revision of the catsharks, family Scyliorhinidae /

A revision of the catsharks, family Scyliorhinidae /

Evolutionary trajectories of tooth histology patterns in modern sharks (Chondrichthyes, Elasmobranchii)

Tooth mineralization and histology patterns in extinct and extant snaggletooth sharks, Hemipristis (Carcharhiniformes, Hemigaleidae)—Evolutionary significance or ecological adaptation?

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