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STATISTICAL ANALYSIS OF NEOHELOS DENTAL MEASUREMENTS

Length and width measurements of the cheek teeth of the mid-Tertiary Australian diprotodontoid Neohelos from three areas have been analysed statistically. The three areas were Lake Ngapakaldi, South Australia; Bullock Creek, Northern Territory; and Riversleigh, Queensland. Measurements of individual features were compared between populations of Neohelos from different localities utilising Student's t-test. These outcomes were subsequently summarised utilising means of the t-test values as the basis for assessing the degree of similarity between population pairs. This information was then expressed graphically by means of a dendrogramme showing the clustering of populations on the basis of the relative degree of similarity. This mode of analysis is based solely on size and proportional differences in tooth measurements between populations. As such, its weakness in that two quite unrelated taxa would be judged as similar if their tooth dimensions happen to be the same. However, where a difference on this basis is recognised, it is to be anticipated that examination of other, perhaps quite subtle features will corrorborate that different taxa are present. What examination of the dendrogrammes shows is that with two exceptions, the Bullock Creek Neohelos spB material stands quite apart from all other sites. The exceptions are from two sites at Riversleigh: Jaw Junction specimens of Neohelos spC, a species known nowhere else and three teeth of Neohelos spB from Henk's Hollow. It is solely on the basis of qualitative characters that Neohelos spB and Neohelos spC are split apart. Likewise, the Riversleigh Cleft of Ages Neohelos spA material and the single specimen of Nimbadon scottorrorum from the Fig Tree locality at Riversligh both group with one of the two distinct clusters of Riversleigh Neohelos tirarensis populations.