Evolutionary and biogeographical implications of phylogenetic analysis of the late Palaeozoic trilobite Paladin
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Phylogenetic analysis of 19 species assigned to the Carboniferous and Permian trilobite genus Paladin produced a single most parsimonious tree with four distinct branches termed Clades A to D. Clade A is made up of six species that are geographically restricted to the interior shelf regions of the United States and are assigned to Kaskia. Clade B of five species, which includes Paladin morrowensis (Mather), is known from the southern and western United States; these five species conform morphologically to the original diagnosis of Paladin. Clade C consists of five Visean to Namurian species from western and eastern Europe and at least three of the species should be assigned to Weberides. Clade D consists of two late Carboniferous and one early Permian species from the Ukraine, western Russia, and Spitsbergen. This c1ade is distinct from all the others analysed and probably represents a yet unnamed genus.
Citations
BREZINSKI, D.K. 2003. Evolutionary and biogeographical implications of phylogenetic analysis of the late Palaeozoic trilobite Paladin. In LANE, P.D., SIVETER, D.J., and FORTEY, R.A. (eds), Trilobites and their relatives. Special Papers in Palaeontology, 70, 365–375.