TY - JOUR N2 - Defining species boundaries, due to morphological variation, often represents a significant challenge in paleozoology. In this paper we report results from multi− and univariate data analyses, such as enhanced clustering techniques, principal coordinates ordination method, kernel density estimations and finite mixture model analyses, revealing some morphometric patterns within the Eocene Antarctic representatives of Palaeeudyptes penguins. These large−sized birds were represented by two species, P. gunnari and P. klekowskii , known mainly from numerous isolated bones. Investigations focused on tarsometatarsi, crucial bones in paleontology of early penguins, resulted in a probability−based framework allowing for the “fuzzy” partitioning the studied specimens into two taxa with partly overlapping size distributions. Such a number of species was supported by outcomes from both multi− and univariate studies. In our opinion, more reliance should be placed on the quantitative analysis of form when distinguishing between species within the Antarctic Palaeeudyptes . L1 - http://www.czasopisma.pan.pl/Content/99550/PDF/popore-2013-0020.pdf L2 - http://www.czasopisma.pan.pl/Content/99550 PY - 2013 IS - No 3 EP - 252 DO - 10.2478/popore−2013−0020 KW - Antarctic KW - La Meseta Formation KW - Paleogene KW - Sphenisciformes KW - statistics KW - systematics A1 - Jadwiszczak, Piotr A1 - Hospitaleche, Carolina Acosta PB - Polish Academy of Sciences PB - Committee on Polar Research DA - 2013 T1 - Distinguishing between two Antarctic species of Eocene Palaeeudyptes penguins: a statistical approach using tarsometatarsi SP - 237 UR - http://www.czasopisma.pan.pl/dlibra/publication/edition/99550 T2 - Polish Polar Research ER -