scholarly journals Shark teeth

BDJ ◽  
2021 ◽  
Vol 231 (1) ◽  
pp. 3-3
Author(s):  
A. Venugopal ◽  
A. Marya ◽  
M. I. Karobari
Keyword(s):  
Shark Teeth

Shark Teeth in Kansas

1965 ◽  
Vol 40 (11) ◽  
pp. 805-807
Author(s):  
Larry W. Davis
Keyword(s):  
Shark Teeth

scholarly journals Eocene (Lutetian) Shark-Rich Coastal Paleoenvironments of the Southern North Sea Basin in Europe: Biodiversity of the Marine Fürstenau Formation Including Early White and Megatooth Sharks

2012 ◽  
Vol 2012 ◽  
pp. 1-22 ◽  
Author(s):  
C. G. Diedrich
Keyword(s):  
Central Europe ◽  
North Sea ◽  
Lower Cretaceous ◽  
Marine Mammals ◽  
Fish Fauna ◽  
White Shark ◽  
Benthic Macrofauna ◽  
Northern Germany ◽  
Terrestrial Vertebrates ◽  
Shark Teeth

The Fürstenau Formation (Lutetian, Paleogene, Eocene) is based on type sections near Fürstenau in Germany (central Europe) and is built of 22 meter thick marine glauconitic and strongly bioturbated sands, clays, and a vertebrate-rich conglomerate bed. The conglomerate layer from the Early Lutetian transgression reworked Lower Cretaceous, and Paleogene marine sediments. It is dominated by pebbles from the locally mountains which must have been transported by an ancient river in a delta fan. Marine reworked Lower Cretaceous and Paleogen pebbles/fossils, were derived from the underlying deposits of northern Germany (= southern pre North Sea basin). The benthic macrofauna is cold upwelling water influenced and non-tropical, and medium divers. The vertebrate fish fauna is extremely rich in shark teeth, with about 5,000 teeth per cubic meter of gravel. The most dominant forms are teeth from sand shark ancestors Striatolamia macrota, followed by white shark ancestors Carcharodon auriculatus. Even teeth from the magatooth shark ancestor Carcharocles sokolovi are present in a moderately diverse and condensed Paleogene fish fauna that also includes rays, chimaeras, and more then 80 different bony fish. Fragmentary turtle remains are present, and few terrestrial vertebrates and even marine mammals with phocids, sirenians and possibly whales.

Shark teeth: a case of multiple supernumerary teeth

2021 ◽  
Vol 14 (3) ◽  
pp. 135-137
Author(s):  
Fionnuala Loy ◽  
Victoria Elton
Keyword(s):  
Computed Tomography ◽  
Cone Beam Computed Tomography ◽  
Unusual Case ◽  
Treatment Options ◽  
Cone Beam ◽  
Supernumerary Teeth ◽  
Shark Teeth ◽  
Adjacent Structures ◽  
The Family ◽  
Dental Hospital

A 44-year-old male was referred to the Department of Orthodontics at Manchester Dental Hospital. He presented with pain from his heavily restored, lower right second premolar, which had an apical supplemental tooth, visible radiographically. The dentist queried whether the second premolar tooth could be extracted and the supplemental tooth aligned in its place. Clinical examination revealed no relevant abnormalities. The family and medical history were non-contributory. Panoramic tomography revealed multiple supplemental supernumerary teeth in the canine and premolar regions. Cone beam computed tomography and multidisciplinary team input were required to plan the treatment for this unusual case. CPD/Clinical Relevance: These findings highlight the management and treatment options for a case of non-syndromic, multiple supernumerary teeth. Consideration must be given to the risk of damage to adjacent structures if surgically removing supernumerary teeth, and the risk that supernumerary teeth may be ankylosed and not amenable to alignment within the arch.

SHARK TEETH FROM BRONZE AGE GAVDOS.

2021 ◽  
pp. 317-324
Author(s):  
Katerina KOPAKA
Keyword(s):  
Bronze Age ◽  
Shark Teeth

scholarly journals Shark–Cetacean trophic interaction, Duinefontein, Koeberg, (5 Ma), South Africa

2015 ◽  
Vol Volume 111 (Number 11/12) ◽  
Author(s):  
Romala Govender ◽  
Keyword(s):  
South Africa ◽  
Cause Of Death ◽  
West Coast ◽  
Trophic Interaction ◽  
The West ◽  
Carcharodon Carcharias ◽  
Inverted Position ◽  
Bite Marks ◽  
Shark Teeth ◽  
Long Time

Abstract This study forms part of a larger project to reconstruct the Mio-Pliocene marine palaeoenvironment along South Africa’s west coast. It documents the shark–cetacean trophic interaction during the Zanclean (5 Ma) at Duinefontein (Koeberg). The damage described on the fragmentary cetacean bones was compared with similar damage observed on fossils from Langebaanweg, a Mio-Pliocene site on the west coast of South Africa, and data present in the literature. This comparison showed that the damage was the result of shark bites. The state of preservation makes it difficult to determine if the shark bite marks were the cause of death or as a result of scavenging. The presence of the bite marks on the bone would, however, indicate some degree of skeletonisation. Bite marks on some cranial fragments would suggest that the cetacean’s body was in an inverted position typical of a floating carcass. The preservation of the material suggests that the bones were exposed to wave action resulting in their fragmentation as well as abrasion, polishing and rolling. It also suggests that the cetacean skeletons were exposed for a long time prior to burial. The morphology of the bites suggests that the damage was inflicted by sharks with serrated and unserrated teeth. Shark teeth collected from the deposit include megalodon (Carcharodon megalodon), white (Carcharodon carcharias) as well as mako (Isurus sp. and Cosmopolitodus hastalis) sharks, making these sharks the most likely predators/scavengers.

Enamel and bone in shark teeth: With a note on fibrous enamel in fishes

1970 ◽  
Vol 77 (2) ◽  
pp. 161-187 ◽  
Author(s):  
Melvin L. Moss
Keyword(s):  
Shark Teeth

scholarly journals A partial braincase and other skeletal remains of Oligocene angel sharks (Chondrichthyes, Squatiniformes) from northwest Belgium, with comments on squatinoid taxonomy

2016 ◽  
Vol 85 (2) ◽  
pp. 147-171 ◽  
Author(s):  
Frederik H. Mollen ◽  
Barry W.M. van Bakel ◽  
John W.M. Jagt
Keyword(s):  
Comparative Anatomy ◽  
Interspecific Variation ◽  
Molecular Study ◽  
Shark Species ◽  
Southwest Atlantic ◽  
Boom Clay ◽  
Shark Teeth ◽  
Modern Species ◽  
Differential Characters ◽  
Clay Formation

A detailed redescription of a chondrocranium from the basal Boom Clay Formation (Rupelian, Upper Oligocene) at the SVK clay pit, Sint-Niklaas (province of Oost-Vlaanderen, Belgium), previously assigned to the sawshark Pristiophorus rupeliensis, is presented. The chondrocranium is re-identified as that of an angel shark (Squatinidae), based on comparative anatomy of extant Squatina, inclusive of CT scans of Squatina africana, S. australis, S. dumeril, S. guggenheimand S. squatina, with different geographic distributions and representing all four angel shark clades as defined in a previous molecular study. Differential characters for chondrocrania listed in earlier accounts to discriminate angel shark species from the southwest Atlantic proved to be even more revealing when comparing angel sharks from different regions/clades. Despite this wide interspecific variation, the fossil chondrocranium compares well with modern Squatina, but differs in having a UUU-shaped ventral margin of the occipital region and rounded margins of the upper postorbital processes. The distal expansion of the upper postorbital processes present in modern species has not yet been observed in extinct squatinoids and might constitute a derived character for modern representatives only. Angel shark teeth and vertebrae are well known from the same basal deposit at the SVK clay pit, but Cenozoic squatinid taxonomy remains problematic. It is here discussed in detail for the Oligocene taxa S. angeloides, S. rupeliensisand S. beyrichi. For the time being, all SVK material is left in open nomenclature and referred to as Squatinasp.

scholarly journals Fossil microbial shark tooth decay documents in situ metabolism of enameloid proteins as nutrition source in deep water environments

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Iris Feichtinger ◽  
Alexander Lukeneder ◽  
Dan Topa ◽  
Jürgen Kriwet ◽  
Eugen Libowitzky ◽  
...  
Keyword(s):  
Organic Content ◽  
Shark Teeth ◽  
In Situ Preservation ◽  
Mineralized Tissues ◽  
New Type ◽  
Tissue Alteration ◽  
First Time ◽  
Nutrition Source ◽  
Organic Remains

AbstractAlteration of organic remains during the transition from the bio- to lithosphere is affected strongly by biotic processes of microbes influencing the potential of dead matter to become fossilized or vanish ultimately. If fossilized, bones, cartilage, and tooth dentine often display traces of bioerosion caused by destructive microbes. The causal agents, however, usually remain ambiguous. Here we present a new type of tissue alteration in fossil deep-sea shark teeth with in situ preservation of the responsible organisms embedded in a delicate filmy substance identified as extrapolymeric matter. The invading microorganisms are arranged in nest- or chain-like patterns between fluorapatite bundles of the superficial enameloid. Chemical analysis of the bacteriomorph structures indicates replacement by a phyllosilicate, which enabled in situ preservation. Our results imply that bacteria invaded the hypermineralized tissue for harvesting intra-crystalline bound organic matter, which provided nutrient supply in a nutrient depleted deep-marine environment they inhabited. We document here for the first time in situ bacteria preservation in tooth enameloid, one of the hardest mineralized tissues developed by animals. This unambiguously verifies that microbes also colonize highly mineralized dental capping tissues with only minor organic content when nutrients are scarce as in deep-marine environments.

Palaeoecological implications of neoselachian shark teeth from the Bathonian (Middle Jurassic) ore-bearing clays at Gnaszyn, Kraków-Silesia Homocline, Poland

2012 ◽  
Vol 62 (3) ◽  
pp. 397-402 ◽  
Author(s):  
Jan Rees
Keyword(s):  
Benthic Invertebrates ◽  
Middle Jurassic ◽  
Bony Fish ◽  
Systematic Sampling ◽  
Strong Indication ◽  
Dietary Preferences ◽  
Shark Teeth

ABSTRACT Rees, J. 2012. Palaeoecological implications of neoselachian shark teeth from the Bathonian (Middle Jurassic) ore-bearing clays at Gnaszyn, Kraków-Silesia Homocline, Poland. Acta Geologica Polonica, 62 (3), 397-402. Warszawa. Systematic sampling through the Middle and Upper Bathonian strata at Gnaszyn has resulted in the discovery of 13 neoselachian teeth. Systematically, the teeth represent five taxa including Sphenodus sp., Protospinax sp. 1, Protospinax sp. 2, Palaeobrachaelurus sp. and another, indeterminate orectolobiform. The presence of two species of the flattened and bottom-dwelling Protospinax and two different orectolobiforms that are likely to have lived near the bottom, is a strong indication of oxygenated bottom conditions at the time of deposition. The dietary preferences of these taxa included a wide variety of benthic invertebrates. The synechodontiform Sphenodus may have been the first pelagic predatory neoselachian in the Jurassic, equipped with high and slender piercing teeth that formed a tearing-type dentition. The diet of Sphenodus probably included bony fish, smaller sharks and cephalopods.

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