A new eubrachythoracid arthrodire, Harrytoombsia elegans gen. et sp. nov., is described from the Upper Devonian Gogo formation of Western Australia. Its structure and relationships are discussed within the framework provided by a new sketch cladogram for arthrodires. H. elegans is morphologically similar to Coccosteus cuspidatus, but its relationships among primitive eubrachythoracids are unknown.
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Miles et al. (1979) studied this question.
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