Investigadores y Estudiantes (licenciatura y posgrado) en estancias de investigación en el Lab. de Morfometría, desde 1995.

30 septiembre, 2013

Marcia Ramírez

Dra.  Marcia María Ramírez Sánchez (2016)
Profesor de Asignatura "B"
Departamento de Biología Comparada, Facultad de Ciencias, UNAM
Circuito Exterior s/n Cd. Universitaria, C.P. 04510, México, D.F.
Tel. +52 (55) 56 22 49 23
Morfometría filogenética de ácaros dulceacuícolas del subgénero Megaluracarus.

Ramirez-Sanchez, M.M, E. De Luna & C. Cramer. 2016. Geometric and traditional morphometrics for the assessment of character state identity: multivariate statistical analyses of character variation in the water mite genus Arrenurus (Acari, Hydrachnidia, Arrenuridae). Zoological Journal of the Linnean Society.
DOI: 10.1111/zoj.12384
Geometric and traditional morphometric approaches are tested to describe and reveal taxonomic characters and character states in variation of shape and size of idiosoma morphology in the Arrenuridae. Patterns of variation of idiosoma and glandularia features of males from 11 Mexican species of Arrenurus (Megaluracarus) and two species of subgenus Dadayella were explored with five landmark configurations and three sets of interlandmark distances. Separate principal component analyses (PCA) and canonical variate analyses (CVA) were performed for each data set. The eight multivariate analyses of variance among 13 a priori groups (species) detected significantly different morphometric variants, which were interpreted as different taxonomic character states. Patterns of character state similarity among species were examined with unweighted-pair grouping method using averages (UPGMA) cluster analyses on Mahalanobis distances. Analyses of five landmark configurations revealed important taxonomical variation in the anterior idiosoma outline (10 character states), the outline of the posterior region or cauda (13 states), the distribution of postocularia, and the second and third pairs of dorsoglandularia (nine states), the fourth pair of dorsoglandularia (three states), and ventroglandularia on the posterior side of idiosoma (nine character states). Multivariate analyses of three sets of distance measurements also resulted in the detection of potential taxonomic characters related to idiosoma size (12 character states), postocularia and dorsoglandularia (13 states), and ventroglandularia (nine character states). Morphometric analyses of distances and shapes provide a formal basis for the interpretation of taxonomic characters, and for the discovery of character states. These characters should be investigated further in a wider sample of species for the phylogenetic systematics of these water mites. In the meantime, idiosoma regions and structures were tested for congruence in a phylogenetic analysis, and were proposed as homologous among the species sampled.
Additional keywords: cauda shape – character homology – glandularia – idiosoma shape – idiosoma size – Megaluracarus – taxonomic characters.

Estancias de investigación: 2009- 2013

    Proyecto de tesis doctoral


    Phylogenetic analyses of character variation in the the water mite
    Arrenurus (Acari, Hydrachnidia, Arrenuridae) 

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