scholarly journals Response paper: Morphometric article by Mejía et al. 2015 alluding genera Herichthys and Nosferatu displays serious inconsistencies

2015 ◽  
Vol 13 (4) ◽  
pp. 673-676
Author(s):  
Mauricio de la Maza-Benignos ◽  
Ma. de Lourdes Lozano-Vilano ◽  
María Elena García-Ramírez

ABSTRACT In the present response paper, the article entitled "Morphometric variation of the Herichthys bartoni (Bean, 1892) species group (Teleostei: Cichlidae): How many species comprise H. labridens (Pellegrin, 1903)?" by Mejía et al . 2015 is critically reviewed. The current review pinpoints some of the more conspicuous conceptual inconsistencies and fundamental errors found in the study by Mejía et al . (2015), It is contended that the authors fail to provide any new insights into the complex biogeography and evolutionary history of the Nosferatu and Herichthys genus groups, and that while results of their Cox1 molecular analysis are comparable to those by De la Maza-Benignos et al . (2015), the conclusions of the two studies are not comparable. In addition, it is contested that, whereas the designation of genus Nosferatu by De la Maza-Benignos et al . (2015) was found on the principles of the biological and phylogenetic species concepts, the rejection of the genus by Mejía et al . (2015) is solely based "on the presence of (overlapping) morphometric characters" between genera. The assumption by Mejía et al . (2015),that because their geometric morphometrics analysis failed to provide separation of species, then Nosferatu genus does not correspond to a valid taxon; and their suggesting geometric morphometrics "as useful tool to discriminate species, because it allows to propose diagnostic characters" were not supported by their results. While Mejía et al . present some interesting thoughts on the systematics of Nosferatu , they unfortunately fail to provide any data that can be objectively assessed as relevant to motivate any changes in the current taxonomy.

2019 ◽  
Author(s):  
Ryan Bracewell ◽  
Doris Bachtrog

The Drosophila obscura species group shows dramatic variation in karyotype, including transitions among sex chromosomes. Members of the affinis and pseudoobscura subgroups contain a neo-X chromosome (a fusion of the X with an autosome), and it was shown that ancestral Y genes of Drosophila have become autosomal in species that contain the neo-X. Detailed analysis in species of the pseudoobscura subgroup revealed a translocation of ancestral Y genes to the small dot chromosome of that group. Here, we show that the Y-dot translocation is restricted to the pseudoobscura subgroup, and translocation of Y genes in the affinis subgroup followed a different route. We find that most ancestral Y genes moved independently to autosomal or X-linked locations in different taxa of the affinis subgroup, and we propose a dynamic model of sex chromosome formation and turnover in the obscura species group. Our results show that Y genes can find unique paths to escape an unfavorable genomic environment.


Zootaxa ◽  
2008 ◽  
Vol 1842 (1) ◽  
pp. 35 ◽  
Author(s):  
CARMELO ANDÚJAR ◽  
JOSÉ LUÍS LENCINA ◽  
JOSÉ SERRANO

A new species of the genus Typhlocharis Dieck (Coleoptera: Carabidae, Anillini), T. martini, described from the upper Segura River (province of Albacete, southeast Spain), is included in the diecki group characterised by a series of 4 +3 setae in the lateral umbilical series and a reduced number of preapical and apical dentiform projections of the elytron. A key to the eight species of the diecki species group is included. The relationships of the new taxon and the hypotheses about the evolutionary history of Typhlocharis and the diecki species group are discussed.


2020 ◽  
Vol 12 (5) ◽  
pp. 494-505
Author(s):  
Ryan Bracewell ◽  
Doris Bachtrog

Abstract The Drosophila obscura species group shows dramatic variation in karyotype, including transitions among sex chromosomes. Members of the affinis and pseudoobscura subgroups contain a neo-X chromosome (a fusion of the X with an autosome), and ancestral Y genes have become autosomal in species harboring the neo-X. Detailed analysis of species in the pseudoobscura subgroup revealed that ancestral Y genes became autosomal through a translocation to the small dot chromosome. Here, we show that the Y-dot translocation is restricted to the pseudoobscura subgroup, and translocation of ancestral Y genes in the affinis subgroup likely followed a different route. We find that most ancestral Y genes have translocated to unique autosomal or X-linked locations in different taxa of the affinis subgroup, and we propose a dynamic model of sex chromosome formation and turnover in the obscura species group. Our results suggest that Y genes can find unique paths to escape unfavorable genomic environments that form after sex chromosome–autosome fusions.


Peptides ◽  
2007 ◽  
Vol 28 (6) ◽  
pp. 1268-1274 ◽  
Author(s):  
J. Michael Conlon ◽  
Ahmed al-Dhaheri ◽  
Eissa al-Mutawa ◽  
Rokaya al-Kharrge ◽  
Eman Ahmed ◽  
...  

2015 ◽  
Vol 13 (1) ◽  
pp. 61-76 ◽  
Author(s):  
Omar Mejía ◽  
Fabián Pérez-Miranda ◽  
Yatzil León-Romero ◽  
Eduardo Soto-Galera ◽  
Efraín de Luna

Cichlids of the tribe Heroini have long been a source of taxonomical conflict. In particular, the species included in the Herichthys bartoni group have failed to be recovered as monophyletic in different molecular studies. In this paper we use traditional and geometric morphometrics to evaluate morphological variation in the species included in the H. bartoni complex in order to evaluate the number of species it contains. An update of a previously published DNA barcoding study suggests the existence of three genetic clusters that included the six recognized species analyzed in this study, none of them recovered as monophyletic. On the other hand, geometric morphometrics arise as a useful tool to discriminate species due that traditional morphometrics showed a high overlap in the characters analyzed that prevents the proposal of diagnostic characters.


2018 ◽  
Vol 41 ◽  
Author(s):  
Kevin Arceneaux

AbstractIntuitions guide decision-making, and looking to the evolutionary history of humans illuminates why some behavioral responses are more intuitive than others. Yet a place remains for cognitive processes to second-guess intuitive responses – that is, to be reflective – and individual differences abound in automatic, intuitive processing as well.


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