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I've found five Petalodus teeth and have been spending a lot of time reading research papers on them. I got the idea of trying to get released photographs for the 16 holotypes of named species within the Paleobiological database. I got the 16 named species from a list here: http://fossilworks.org/?a=referenceInfo&reference_no=42606 Petalodus ohioensis was easy enough to find, Yale publishes some of their collection online. Unfortunately the one in their collection is only a cast. The original may be lost. This paper has a few, including ohioensis. Taxonomic validity of Petalodus ohioensis (Chondrichthyes, Petalodontidae) based on a cast of the lost holotype – K. Carpenter, W. Itano Here are the 16 I am trying to get. I've asked permission for allegheniensis and I have ohioensis. I need to see if there are holotypes for the other 14 and which collections they are stored. I would love to create a public open web page that shows all 16 (if they exist). Petalodus acuminatus 1836 (Agassiz) Petalodus allegheniensis 1856 (Leidy) Petalodus arcuatus 1870 (St. John) Petalodus curtus 1870 (Newberry and Worthen) Petalodus davisii 1889 (Woodward) Petalodus flabellula 1889 (Woodward) Petalodus grandis 1883 (Davis) Petalodus hastingsiae 1840 (Owen) Petalodus hybridus 1875 (St. John and Worthen) Petalodus jewetti 1957 (Miller) Petalodus knappi 1879 (Newberry) Petalodus linearis 1838 (Agassiz) Petalodus linguifer 1866 (Newberry and Worthen) Petalodus ohioensis 1853 (Safford) Petalodus proximus 1875 (St. John and Worthen) Petalodus sagittatus 1843 (Agassiz) I am going to continue down the road, but figured I would raise the issue here. One road block is that some of the original teeth may be described in non-english research papers. Thank you!