Fig. 30 in Systematic Reviews Of New Guinea Coccymys And ''Melomys'' Albidens (Muridae, Murinae) With Descriptions Of New Taxa

Fig. 30. Ratio diagram illustrating some proportional relationships in cranial and dental dimensions between samples of adult Coccymys. The standard is the type series of C. ruemmleri from Lake Habbema (N 5 15; includes the holotype), which is contrasted with the sample of C. kirrhos from Mt. Dayman (N 5 3; includes the holotype). Data are derived from values for mean, standard deviation, and sample size of variables listed in tables 4 and 6. For each measurement, the absolute value of the mean, and plus or minus two standard errors of the mean, were converted to logarithms. Next, the logarithm of the mean of the standard was subtracted from the logarithms of the mean, and plus or minus two standard errors, of the comparative sample. Measurements larger than the standard are thus represented by positive values, those smaller by negative values. The lines connect sample means, and the bracketing symbols represent ± 2 SE of the mean. A sample having the same proportions as the standard will be represented by mean values on a line parallel to that of the standard regardless of absolute size. Also, if values for the sample being compared with the standard are similar in absolute size, they will be close together on the diagram. If proportions between any of the measured dimensions are similar, the positions of their points relative to each other on the horizontal scale will be similar.