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Zapsalis is a genus of Dromaeosaurinae theropod . It is a tooth taxon, often considered nomen dubium because of the fragmentary nature of the , which include teeth but no other remains.
After the Bone Wars, the type fossils of Zapsalis and the Laelaps species were sold to the American Museum of Natural History in New York. In the wake of the Bone Wars, the complicated errors in dinosaur taxonomy were left to other paleontologists, with the Laelaps species being moved to other theropod dinosaurs like Deinodon,Osborn, H. F., & Lambe, L. M. (1902). On Vertebrata of the Mid-Cretaceous of the North West Territory (Vol. 3). Government Printing Bureau.Lambe, L. M. (1902). New genera and species from the Belly River series (Mid-Cretaceous). Contributions to Canadian Paleontology, Geological Survey of Canada 3: 25-81. 1918. The Cretaceous genus Stegoceras typifying a new family referred provisionally to the Stegosauria. Transactions of the Royal Society of Canada, 12, 23-36. Aublysodon,Hatcher, J. B. (1903). Osteology of Haplocanthosaurus, with description of a new species and remarks on the probable habits of the Sauropoda and the age and origin of the Atlantosaurus beds: additional remarks on Diplodocus (Vol. 2, No. 1). Carnegie Museum. and Dromaeosaurus.Matthew, W. D., & Brown, B. (1922). The family Deinodontidae, with notice of a new genus from the Cretaceous of Alberta. Bulletin of the AMNH; v. 46, article 6.Kuhn, O. (1939). Saurischia, Fossilium Catalogus I: Animalia, Pars 87. W. Quenstedt, Munich. Z. abradens was moved to Dromaeosaurus and synonymized with the other Dromaeosaur Paronychodon.Hotton III, N. (1965). Fossil Vertebrates from the Late Cretaceous Lance Formation, Eastern Wyoming. It wasn't until 2002 that Julia Sankey e.a. concluded the teeth represented a separate " ?Dromaeosaurus Morphotype A". In 2013 Derek Larson and Philip Currie recognised Zapsalis as a valid taxon from the Judith River and Dinosaur Park Formation. The teeth are typified by a combination of rounded denticles, straight rear edge and vertical grooves. Similar teeth from the older Milk River Formation were referred to a cf. Zapsalis. In 2019, Currie and Evans announced that the Zapsalis teeth from the Dinosaur Park Formation represented the second premaxillary tooth of Saurornitholestes langstoni, in a paper describing a complete skull of that species. The authors kept the species distinct because the type species' holotype is likely indeterminate on a species level.Baszio, S. (1997). Systematic palaeontology of isolated dinosaur teeth from the latest Cretaceous of south Alberta, Canada. Courier Forschungsinstitut Senckenberg, 196, 33-77.
As for Laelaps explanatus and L. laevifrons, they were never synonymized with Zapsalis but have been synonymized with Saurornitholestes langstoni and in turn, Zapsalis, as well.
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