title: [The structure of morphological variability (with the masticatory surface morphotypes of the lower first molar in voles as an example)].
abstract: An analysis of morphotypical variability of the lower first molar in twelve species of Microtus genus revealed similarity in patterns of variability, consisting in two-three homologous series of three morphotypes of one class of rugosity in each series. In the majority of species, morphotypes are located in a single plane. In some species, morphotypes of other class of rugosity form the homologous series of a second plane so that the structure of the variability takes on a three-dimensional form. The variability spectrum is limited by molars design; at the different trends in complication of a masticatory surface have taxonomic weight of subgenus or species rank. Thus, incompleteness of homologous series is caused by taxonomic specificity and is nonrandom in essence.
authors.forename: A A
authors.initials: AA
authors.lastname: Pozdniakov
mesh_terms: D000818:Animals; D003411:Arvicolinae / Q000033:anatomy & histology* / Q000145:classification*; D044822:Biodiversity; D003627:Data Interpretation, Statistical; D008963:Molar / Q000033:anatomy & histology*; D012426:Russia; D013045:Species Specificity; D018709:Statistics, Nonparametric