| Xiphodolamia Temporal range:
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| Xiphodolamia ensis teeth from the London Clay | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Chondrichthyes |
| Subclass: | Elasmobranchii |
| Infraclass: | Osteodonti |
| Superorder: | Lamnae |
| Order: | Odontaspidida |
| Superfamily: | Isuroidea |
| Family: | Lamiostomatidae |
| Subfamily: | †Xiphodolamiinae Glükman 1964[2] |
| Genus: | †Xiphodolamia Leidy, 1877[1] |
| Species[3] | |
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Xiphodolamia is a rare extinct genus of mackerel shark which lived during the Eocene epoch. It is only known from isolated teeth, but has been found in Europe, Africa, and Asia.[4] It is assumed to be pelagic, occurring more frequently in deeper water deposits, most notably the London Clay and Eocene deposits in Denmark. It is distinguished by its rectangular root and twisted blade, unique among mackerel sharks. It is unclear what niche this specialized dentition helped exploit.[5]
- ^ J. Leidy. 1877. Description of vertebrate remains, chiefly from the phosphate beds of South Carolina. Journal of the Academy of Natural Sciences of Philadelphia 8:209–260
- ^ L. S. Glükman. 1964. Class Chondrichthyes, cartilaginous fishes. Subclass Elasmobranchii (sharks). In D. V. Obruchev (ed.), Fundamentals of Paleontology. Vol. XI. Agnatha, Pisces. Izdatel'stvo "Nauka", Moscow 292-352
- ^ "PBDB Taxon".
- ^ "elasmo.com". www.elasmo.com. Retrieved 23 August 2020.
- ^ Adnet, S.; Hosseinzadeh, R.; Antunes, M. T.; Balbino, A. C.; Kozlov, V. A.; Cappetta, H. (1 October 2009). "Review of the enigmatic Eocene shark genus Xiphodolamia (Chondrichthyes, Lamniformes) and description of a new species recovered from Angola, Iran and Jordan". Journal of African Earth Sciences. 55 (3): 197–204. Bibcode:2009JAfES..55..197A. doi:10.1016/j.jafrearsci.2009.04.005. ISSN 1464-343X.