scholarly journals Padrões morfológicos na venação alar de espécies de Tetragona Lepeletier & Serville, 1828 do grupo clavipes (Hymenoptera: Apidae: Meliponini)

2021 ◽  
Vol 3 ◽  
pp. ec03032
Author(s):  
Isamara S. dos Santos ◽  
David S. Nogueira ◽  
Ivan De Castro ◽  
Juliana S. G. Teixeira ◽  
Geusa S. de Freitas ◽  
...  
Keyword(s):  
Morphometric Analysis ◽  
Discriminant Function Analysis ◽  
Stingless Bees ◽  
Function Analysis ◽  
Variation Analysis ◽  
Geometric Morphometric ◽  
Canonical Variation ◽  
Geometric Morphometric Analysis ◽  
The Right ◽  
Taxonomic Studies

Tetragona Lepeletier & Serville, 1828 (Hymenoptera: Apidae) is a genus of stingless bees widely distributed in Brazil. It has 15 species distributed in the Neotropics, from Mexico to Uruguay, nine of which are found in Brazil. However, Tetragona elongata (Lepeletier & Serville, 1828), a species known only from the Southeast region and which had been synonymized with Tetragona clavipes (Fabricius, 1804), was revalidated without any justification. The aim of this study was to test whether the morphometrics analysis of the wings is efficient in the diagnosis of the species of this genus, in addition to testing the validity of the revalidation mentioned above. This technique was applied by accessing the right forewings of 660 workers of T. clavipes, T. elongata e T. quadrangula (Lepeletier, 1836), from five Brazilian collections. For the geometric morphometric analysis, 12 landmarks were selected. The software MorphoJ version 1.6 was used to do Discriminant Function analysis (1000 replications) and Canonical Variation Analysis (CVA). Between T. clavipes and T. elongata, there was a 100% variance between species (canonical variation analysis), suggesting that it may be an indication of speciation. Even though T. elongata has been revalidated, it still has overlapped with T. clavipes, which indicates to be the same species. Taxonomic studies are needed to synonymize them.

Geometric morphometric analysis of different species of Cyprideis deriving from the Early Pleistocene record of Greece.

2021 ◽  
Author(s):  
Ypermachia Dimitriou ◽  
Penelope Papadopoulou ◽  
Maria Kolendrianou ◽  
Maria Tsoni ◽  
George Iliopoulos
Keyword(s):  
Endemic Species ◽  
Early Pleistocene ◽  
Geometric Morphometric ◽  
Representative Species ◽  
Lower Pleistocene ◽  
Close Relationship ◽  
Outline Analysis ◽  
Geometric Morphometric Analysis ◽  
The Right ◽  
Of Greece

<p>The genus Cyprideis is one of the most widespread ostracod representative of the Pleistocene brackish palaeoenvironments. Especially <em>Cyprideis torosa </em>is often found in great numbers and even in monospecific taphocoenoses and for this reason its study is very useful for palaeoenvironmental reconstructions.  The identification of different species of Cyprideis is often complicated and needs careful morphology inspection. This becomes even more difficult in the case of endemic species which present significant similarities with each other.  In this work, we have studied and analyzed several  Cyprideis species (<em>C.torosa, C. frydaci, C.dictyoti, C. pannonica, C. elisabeta, C. seminulum, C. heterostigma</em>) deriving from brackish palaeoenvironments of a Lower Pleistocene marl sequence in Sousaki Basin (Northeastern Corinth Graben, Greece). More specifically size measurements and geometric morphometrics (lateral valve outline of both right and left valves as well as females and males) were used in order to attest the similarities and dissimilarities between the different species and draw conclusions about their origin.  According to the valve outline and the multivariate analysis a close relationship between the valve shape of all Cyprideis species can be noticed. <em>C. torosa</em> is commonly grouped with <em>C. pannonica</em> except in the male right valve where the two species show some differences.  The endemic species <em>C. frydaci</em> and <em>C. dictyoti</em> can be identified by the differences in the right valve of the male and female respectively.  The other species could not be substantially differentiated using just the outline analysis which possibly denotes their common genetic origin.  The valve outline has proved to be a very useful character for recognizing the different species especially when the two valves of both females and males are considered. More analyses of representative species of Miocene and Pliocene Cyprideis are needed in order to establish their phylogenetic relationships and draw conclusions about their common ancestor.</p>

scholarly journals Geometric morphometric analysis of malocclusion on lateral cephalograms in Malaysian population

2020 ◽  
Vol 53 (3) ◽  
pp. 378-378
Author(s):  
Choy Ker Woon ◽  
Nurul Aiman Abu Jamal ◽  
Muhamad Nasim Ilmi Mohd Noor ◽  
Syiral Mastura Abdullah ◽  
Nurjehan Mohamed Ibrahim ◽  
...  
Keyword(s):  
Morphometric Analysis ◽  
Geometric Morphometric ◽  
Malaysian Population ◽  
Lateral Cephalograms ◽  
Geometric Morphometric Analysis

scholarly journals Application of Three Dimensional Geometric Morphometric Analysis for Sexual Dimorphism of Human Skull: A Systematic Review

2020 ◽  
Vol 18 (1) ◽  
Author(s):  
Abdelnasser Ibrahim ◽  
Aspalilah Alias ◽  
Mohamed Swarhib Shafie ◽  
Faridah Mohd Nor
Keyword(s):  
Systematic Review ◽  
Sexual Dimorphism ◽  
Morphometric Analysis ◽  
Meta Analysis ◽  
Positive Contribution ◽  
Inclusion Criteria ◽  
Geometric Morphometric ◽  
Human Skull ◽  
Geometric Morphometric Analysis

The present systematic review explores the most sexually dimorphic parameters by using geometric morphometric analysis of human skull. An extended search was conducted in Google Scholars and PubMed (published between 2005 and 2017). The main inclusion criteria were research articles published in English, and studies that used geometric morphometric analysis for classification of human skull. The literature search identified 54 potential relevant articles whereby, five had met the inclusion criteria. Most studies reported positive contribution of geometric morphometric as an alternative and accurate tool for classification of unknown human crania. Geometric morphometric method resulted in a high classification accuracy of sexual dimorphism among different populations. Further studies are required to approach the best method used for varied types of postcranial bones equipped with a more advanced meta-analysis of the results.

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