1. Checa A, Martin-Ramos D (1989) Growth and function of spines in the Jurassic ammonite Aspidoceras. Palaeontology 32:645–655
2. Duffin CJ (1997) The dentition of Hybodus hauffianus Fraas, 1895 (Toarcian, Early Jurassic). Stuttgarter Beitr Naturk B 256:1–20
3. Fürsich FT, Oschmann W (1986) Storm shell beds of Nanogyra virgula in the Upper Jurassic of France. N Jb Geol Paläont Abh 172:141–161
4. Ginter M, Ivanov A, Lebedev O (2005) The revision of “Cladodus” occidentalis, a late Palaeozoic ctenacanthiform shark. Acta Palaeontol Pol 50:623–631
5. Hansen MC, Mapes RH (1990) A predator-prey relationship between sharks and cephalopods in the Late Paleozoic. In: Boucot AJ (ed) Evolutionary paleobiology of behavior and coevolution. Elsevier, Amsterdam, pp 189–192