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An unusual new lepidopleurid polyplacophoran (Mollusca) from the Germanic Muschelkalk (Triassic)

A fragmentary and probably immature polyplacophoran shell from the Middle Triassic Germanic Muschelkalk is presented. Morphological peculiarities of the specimen are a stiff connection of the head valve to the adjoining intermediate valve and the presence of a yet undescribed brim-like shell constituent, informally called border-plate herein. The unusually well-preserved shell structure is discussed in detail comprising tegmentum, crossed-lamellar p. hypostracum and the (articulamental?) border-plate. Characteristics indicate a systematic position within the order Lepidopleurina.