scholarly journals Geometric morphometric analysis as a proxy to evaluate age-related change in molar shape variation of low-crowned Notoungulata (Mammalia)

2017 ◽  
Vol 279 (2) ◽  
pp. 216-227 ◽  
Author(s):  
Alejo C. Scarano ◽  
Bárbara Vera
Keyword(s):  
Morphometric Analysis ◽  
Shape Variation ◽  
Geometric Morphometric ◽  
Age Related ◽  
Geometric Morphometric Analysis

A geometric morphometric analysis of hominin upper premolars. Shape variation and morphological integration

2011 ◽  
Vol 61 (6) ◽  
pp. 688-702 ◽  
Author(s):  
Aida Gómez-Robles ◽  
María Martinón-Torres ◽  
José María Bermúdez de Castro ◽  
Leyre Prado-Simón ◽  
Juan Luis Arsuaga
Keyword(s):  
Morphometric Analysis ◽  
Morphological Integration ◽  
Shape Variation ◽  
Geometric Morphometric ◽  
Geometric Morphometric Analysis

scholarly journals Sexual dimorphism of the mandibular conformational changes in aging human adults: A multislice computed tomographic study by geometric morphometrics

PLoS ONE ◽  
2021 ◽  
Vol 16 (6) ◽  
pp. e0253564
Author(s):  
Leonor Costa Mendes ◽  
Julien Delrieu ◽  
Claudia Gillet ◽  
Norbert Telmon ◽  
Delphine Maret ◽  
...  
Keyword(s):  
Sexual Dimorphism ◽  
Conformational Changes ◽  
Sexually Dimorphic ◽  
Shape Variation ◽  
Geometric Morphometric ◽  
Computed Tomographic ◽  
Age Related ◽  
Human Adults ◽  
Geometric Morphometric Analysis ◽  
Shape Changes

The aging process has an impact on mandibular bone morphology and can therefore affect shape sexual dimorphism. Understanding the effect of senescence on mandibular shape changes is particularly important to correctly estimate the sex of an individual and predict age-related conformational modifications. The purpose of this study was to assess age-related changes in mandibular shape and sexual dimorphism. The study sample comprised 160 Multi Slice Computed Tomography examinations of individuals aged 40 to 79 years. Geometric morphometric analysis of fourteen osteometric landmarks was used to examine sexual dimorphism and patterns of mandibular shape variation with age. Results showed that mandibular sexual dimorphism of shape remained significant with aging. Conformational changes occurred between 50 and 70 years and were different for male and female individuals. Females presented earlier and more marked age-related shape changes than males. These observations suggest that mandibular senescence is a sexually dimorphic process since its onset, rate, and the areas subjected to conformational changes differ from male to female individuals. Senescence-related changes present substantial variability, and further investigation is required to determine precisely the age that marks their onset.

scholarly journals Geometric morphometric analysis reveals age-related differences in the distal femur of Europeans

2017 ◽  
Vol 4 (1) ◽  
Author(s):  
Etienne Cavaignac ◽  
Frederic Savall ◽  
Elodie Chantalat ◽  
Marie Faruch ◽  
Nicolas Reina ◽  
...  
Keyword(s):  
Morphometric Analysis ◽  
Distal Femur ◽  
Geometric Morphometric ◽  
Age Related ◽  
Geometric Morphometric Analysis

scholarly journals Anatomy and shell shape variability in a land snail Bostryx torallyi (Stylommatophora: Bulimulidae)

2020 ◽  
Vol 68 (1) ◽  
Author(s):  
María José Miranda
Keyword(s):  
Morphometric Analysis ◽  
Large Scale ◽  
Ventral View ◽  
Land Snail ◽  
The Other ◽  
Qualitative Description ◽  
Shell Shape ◽  
Shape Variation ◽  
Geometric Morphometric ◽  
Geometric Morphometric Analysis

Introduction: The gastropod Bostryx torallyi shows high variability in shell shape and coloration. Subspecies of this organism have been described based on shell characters but, since they were slightly different, they were synonymized afterwards. Until now, shell variability has been analyzed only descriptively and its anatomy is still unknown. Objective: In this study, I provide anatomical information of B. torallyi and apply a geometric morphometric analysis to evaluate the shell shape variation among specimens. Methods: To accomplish this, type material and numerous lots were examined and dissected out. Additionally, relative warp analysis, based on 9 landmarks in ventral view of the shell, was performed using 80 specimens of 9 localities from Bolivia and Argentina. Results: According to our results, geometric morphometrics is a suitable method to evaluate differences in shell shape among localities; for instance, distinctions in the shell were noticeable between gastropods of low and high altitudes. On the other hand, it was established that the coloration of this species is independent of large-scale factors since the examined specimens came from environments with similar conditions. Furthermore, the sculpture of the protoconch and anatomy of B. torallyi coincided with the other Argentinian species of the genus. Conclusions: Therefore, I concluded that a geometric morphometric analysis of shell shape is a good complement to traditional qualitative description of the characteristics of the shell in this species.

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