Abstract
Dimorphoconus granulatus gen. et. sp. nov. had a dorsal surface covered with two types of solid, granular spines, and a naked ventral surface. Elongate spines occur in lateral rows of eight or nine spines each and another pair lie posteriorly. Conical spines are of two sizes: the larger lie in two dorso-lateral rows of four spines while the smaller occur between the other rows of spines. A possible head region is indicated by five small blunt spines. Comparison of Dimorphoconus with other early enigmatic Palaeozoic fossils has failed to reveal any closely similar organism. However, plumulitid machaeridians and the Mitrosagophora bear sclerites of two types arranged in four rows. Dimorphoconus is tentatively interpreted as an epibenthonic armoured worm.
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