Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Teeth01:15

Teeth

2.3K
The formation of teeth, also known as odontogenesis, is a complex process that begins in utero, around the sixth week of embryonic development. There are three stages to this process: the bud stage, the cap stage, and the bell stage.
In the bud stage, the tooth germ (an aggregation of cells) starts to form in the developing jawbone. During the cap stage, the tooth germ differentiates into enamel organ, dental papilla, and dental sac, which will later develop into the tooth's enamel, dentin...
2.3K
Tooth Anatomy01:21

Tooth Anatomy

2.9K
The human tooth enables us to eat a variety of foods, speak clearly, and even aid in shaping our faces. Teeth are composed of various elements that work together. Here's a detailed look at the anatomy of a human tooth.
The Crown, Neck, and Root
The visible part of the tooth is referred to as the crown. It's covered by enamel, the hardest substance in the human body. The crown is uniquely shaped for each type of tooth, allowing for different functions such as cutting, tearing, or...
2.9K
Types of Selection01:46

Types of Selection

46.4K
Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...
46.4K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Study of bat diversity (Mammalia, Chiroptera) in Xuan Nha Nature Reserve, Son La Province, north-western Vietnam, based on integrative insights from morphology, genetics and echolocation data.

Biodiversity data journal·2025
Same author

Unexpected loss of TAS1R1-TAS1R3 umami taste receptor function in carnivorous Lyncodontini mustelids.

Chemical senses·2025
Same author

A new species of the genus Scincella (Squamata: Scincidae) from Mount Fansipan, Hoang Lien Son Range, northwestern Vietnam.

Zootaxa·2024
Same author

Patterns of Sexual Dimorphism, Static Allometry, and Modularity in the Skull of the Ethiopian White-Footed Mouse, <i>Stenocephalemys albipes</i> (Rodentia: Muridae).

Zoological science·2024
Same author

Evolution of tooth morphological complexity and its association with the position of tooth eruption in the jaw in non-mammalian synapsids.

PeerJ·2024
Same author

A new shrew mole species of the genus Uropsilus (Eulipotyphla: Talpidae) from northwestern Vietnam.

Zootaxa·2024

Related Experiment Video

Updated: Apr 4, 2026

Systematic Assessment of Mammalian Skull Specimens for Dental and Temporomandibular Joint Pathology
07:26

Systematic Assessment of Mammalian Skull Specimens for Dental and Temporomandibular Joint Pathology

Published on: August 22, 2022

2.1K

Tooth Size Variation in Pinniped Dentitions.

Mieczyslaw Wolsan1, Satoshi Suzuki2, Masakazu Asahara3

  • 1The Kyoto University Museum, Kyoto University, Kyoto, Japan; Museum and Institute of Zoology, Polish Academy of Sciences, Warsaw, Poland.

Plos One
|August 29, 2015
PubMed
Summary
This summary is machine-generated.

Pinniped tooth size variation is mostly heterogeneous, with incisors and canines being highly variable. The coefficient of variation reliably measures this dental variation, unlike other statistical methods.

More Related Videos

Author Spotlight: Establishing an Accurate Microhardness Testing Protocol for Craniofacial Tissues
06:16

Author Spotlight: Establishing an Accurate Microhardness Testing Protocol for Craniofacial Tissues

Published on: April 26, 2024

1.4K
Precision of In Vivo Quantitative Tooth Wear Measurement Using Intra-Oral Scans
09:10

Precision of In Vivo Quantitative Tooth Wear Measurement Using Intra-Oral Scans

Published on: July 12, 2022

3.6K

Related Experiment Videos

Last Updated: Apr 4, 2026

Systematic Assessment of Mammalian Skull Specimens for Dental and Temporomandibular Joint Pathology
07:26

Systematic Assessment of Mammalian Skull Specimens for Dental and Temporomandibular Joint Pathology

Published on: August 22, 2022

2.1K
Author Spotlight: Establishing an Accurate Microhardness Testing Protocol for Craniofacial Tissues
06:16

Author Spotlight: Establishing an Accurate Microhardness Testing Protocol for Craniofacial Tissues

Published on: April 26, 2024

1.4K
Precision of In Vivo Quantitative Tooth Wear Measurement Using Intra-Oral Scans
09:10

Precision of In Vivo Quantitative Tooth Wear Measurement Using Intra-Oral Scans

Published on: July 12, 2022

3.6K

Area of Science:

  • Zoology
  • Comparative Anatomy
  • Evolutionary Biology

Background:

  • Mammalian tooth size variation is debated, with limited research on simple-crowned teeth like those in Pinnipedia.
  • Previous studies focused on complex-crowned mammals, leaving a gap in understanding pinniped dental variation.

Purpose of the Study:

  • To investigate linear size variation (length and width) in the permanent dentitions of four pinniped species.
  • To resolve controversies regarding the heterogeneity of tooth size variation and the reliability of different statistical measures.

Main Methods:

  • Analyzed complete permanent dentitions of two phocids (Histriophoca fasciata, Phoca largha) and two otariids (Callorhinus ursinus, Eumetopias jubatus).
  • Examined size variation along the toothrow and among species, including sexual dimorphism.
  • Assessed the reliability of the coefficient of variation, standard deviation of log-transformed data, and residual of standard deviation on mean size.

Main Results:

  • Pinniped tooth size variation was predominantly heterogeneous along the toothrow and between species.
  • Incisors, canines, and mesial/distal postcanines exhibited high variability.
  • Overall dental size variation ranged from low (Phoca largha, otariids) to high (Histriophoca fasciata).
  • Sexual dimorphism was present, with larger teeth in males, particularly canines in otariids.
  • The coefficient of variation proved reliable; standard deviation of log-transformed data was redundant; residual of standard deviation on mean size was inaccurate for heterogeneous variation.

Conclusions:

  • Pinniped tooth size variation is largely heterogeneous, challenging assumptions of homogeneity.
  • The coefficient of variation is a reliable metric for assessing pinniped tooth size variation.
  • Existing hypotheses do not fully explain observed patterns of differential size variation in pinniped dentitions.