Dental histology ofCoelophysis bauriand the evolution of tooth attachment tissues in early dinosaurs

2016 ◽  
Vol 277 (7) ◽  
pp. 916-924 ◽  
Author(s):  
Raymond K.M. Fong ◽  
Aaron R.H. LeBlanc ◽  
David S. Berman ◽  
Robert R. Reisz
Keyword(s):  
Dental Histology

CHANGING CONCEPTS IN DENTAL HISTOLOGY

2006 ◽  
Vol 85 (1) ◽  
pp. 133-144 ◽  
Author(s):  
David B. Scott ◽  
Marie U. Nylen
Keyword(s):  
Dental Histology

scholarly journals Dental Histology

2019 ◽  
pp. 170-197
Author(s):  
Tanya M. Smith
Keyword(s):  
Dental Histology

A new hybodont shark (Chondrichthyes, Elasmobranchii) from the Upper Triassic Tiki Formation of India with remarks on its dental histology and biostratigraphy

2017 ◽  
Vol 92 (2) ◽  
pp. 221-239 ◽  
Author(s):  
Mohd Shafi Bhat ◽  
Sanghamitra Ray ◽  
P. M. Datta
Keyword(s):  
Comparative Analysis ◽  
Multivariate Analyses ◽  
Upper Triassic ◽  
Qualitative Assessment ◽  
New Taxon ◽  
Crown Height ◽  
Freshwater Systems ◽  
Crown Root ◽  
Anterior Teeth ◽  
Dental Histology

AbstractA new lonchidiid genus,Pristrisodus, from the Upper Triassic Tiki Formation of India is described based on multiple, well-preserved, isolated teeth. Comparative analysis resulted in synonymizingParvodus tikiensisandLissodus duffini,which are known from the same horizon and resulted in a new taxon,Pristrisodus tikiensisn. comb. These teeth are elongated with mesiodistal length greater than or equal to twice the labiolingual width and have a high principal cusp, lateral cusplets, a distinct ridge near the crown-root junction labially and higher up on the crown lingually, weak ornamentation, and linear depression along the crown-root junction. Five morphotypes based on overall shape, robustness and crown height are determined. The teeth show a gradual monognathic heterodonty. The anterolateral teeth (morphotypes I−II) have high, pyramidal principal cusp with two or three small but pointed cusplets, and triangular labial and lingual protuberance. The posterolateral teeth (morphotypes III−IV) have four incipient cusplets, relatively low principal cusp, bilobed/rounded, hanging labial and incipient lingual protuberances. Morphotype V comprises anterior teeth that are broad, triangular and robust, and have rounded/blunt principal cusp, one cusplet, and low, hanging labial peg. Multivariate analyses corroborate the qualitative assessment of the Indian hybodonts. Dental histology ofPristrisodusn. gen., shows that it is distinctly different from other lonchidiid genera. The assemblage of freshwater sharks, along with other vertebrate microfossils of the Tiki Formation, shows similarity with that of the lower Tecovas Formation of the Chinle Group, USA. The euryhaline nature resulted in the adaptation of the hybodonts to freshwater systems in India during the Carnian.

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