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The first remains of Dorygnathus, isolated bones and jaw fragments from the Schwarzjura, the Posidonia Shale dating from the Toarcian, were discovered near Banz, Bavaria and in 1830 described by Carl Theodori as Ornithocephalus banthensis, the specific name referring to Banz.
The holotype, which lacked an inventory number, was apparently found in the famous Posidonia Shale, marine strata dating from the middle Toarcian, as can be established from the presence of the snail Coelodiscus in the matrix rock containing the only partially prepared bones.