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Theropod dinosaur teeth from the lowermost Cretaceous Rabekke Formation on Bornholm, Denmark
The dinosaur fauna of the palynologically dated lower Berriasian Skyttegård Member of the Rabekke Formation on the Baltic island of Bornholm, Denmark, is represented by isolated tooth crowns. The assemblage is restricted to small maniraptoran theropods, assigned to the Dromaeosauridae incertae sedis and Maniraptora incertae sedis. The dromaeosaurid teeth are characterized by their labiolingually compressed and distally curved crowns that are each equipped with a lingually flexed mesial carina and a distinctly denticulated distal cutting edge. A morphologically aberrant tooth crown (referred to as Maniraptora incertae sedis) has triangular denticles of uneven width, a feature occasionally found in Upper Cretaceous hesperornithiform toothed diving birds, but also in premaxillary teeth of the velociraptorine Nuthetes from the Lower Cretaceous of England.
Two isolated, presumably shed, dromaeosaurid tooth crowns from the lower Berriasian (Lower Cretaceous) Skyttegård Member of the Rabekke Formation (Nyker Group) on the Baltic island of Bornholm, Denmark. A–C: MGUH No. 28403 in B: labial and C: lingual views; A: enlargement of distal denticles; D–F: MGUH No. 28404 in D: labial and E: lingual views; F: enlargement of distal denticles. Scale bars represent 0.2 mm (A, F) and 1 mm (B–E).