Biochemical Systematics of Five Asteroids of the Family Asteriidae Based on Allozyme Variation

概要

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The family Asteriidae of the order Forcipulatida from Japanese waters includes the five common starfish species belonging to the five different genera. They are Asterias amurensis, Aphelasterias japonica, Distolasterias nipon, Coscinasterias acutispina and Plazaster borealis. The phylogenetic relationship of these five members were investigated by electrophoretic analyses of 15 different enzymes. From the allozyme variation observed in 31 genetic loci, the Nei's genetic distances between species were calculated and the molecular phylogenetic tree for the five species was constructed. The phylogenetic tree indicated the following : (1) The five species are phylogenetically divided into three clusters : (i) A. amurensis and P. borealis ; (ii) A. japonica and D. nipon ; and (iii) C. acutispina. (2) A. amurensis and P. borealis are the most closely related to each other and more recent species which evolved later. (3) A. japonica is more closely related to D. nipon than to other species. (4) C. acutispina is the most distant species of the five members. These electrophoretic results were discussed through the detailed comparison with molecular and non-molecular data, and the differentiation process of five species was speculated.
社団法人日本動物学会の論文
1994-04-15