Microtus multiplex and M. subterraneus are difficult to distinguish morphologically. Here we have 43 known multiplex, 46 known subterraneus and a further 199 unidentified species.
A data frame with 288 observations with a factor indicating the species and observations on a further 8 variables.
a factor with levels
Width of upper left molar 1 (0.001mm)
Width of upper left molar 2 (0.001mm)
Width of upper left molar 3 (0.001mm)
Length of incisive foramen (0.001mm)
Length of palatal bone (0.001mm)
Condylo incisive length or skull length (0.01mm)
Skull height above bullae (0.01mm)
Skull width across rostrum (0.01mm)
89 species have been identified by means of chromosomal analysis.
Airoldi, J.-P., B. Flury, M. Salvioni (1996) dQuoteDiscrimination between two species of Microtus using both classified and unclassified observations Journal of Theoretical Biology 177:247-262
Flury, B.D. (1997) A First Course in Multivariate Statistics, New York: Springer
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