ptychodon is quite distinct from those of other mosasaurids
enables a better paleoecologic characterization of the environments where this amazing dinosaur assemblage lived
Rare crocodile species
with most of the mineral manifesting in crusts or small reniform aggregates
21560 - Top Well Prepared "Flying" 2.28 Inch Paralejurus spatuliformis Devonian Psammechinus ptychodon is quite distinct fromNicely well preserved and prepared specimen. Paralejurus sp, Hawle and Corda 1847 (trilobite) Trilobita Corynexochida Styginidae Parent taxon: Styginidae according to P. A. Jell and J. M. Adrain 2002 See also Sepkoski 2002 Sister taxa: Alceste, Ancyropyge, Arctipeltis, Australoscutellum, Bojoscutellum, Breviscutellum, Bumastinae, Cekovia, Cornuscutellum, Cybantyx, Decoroscutellum, Delgadoa, Dentaloscutellum, Dulanaspis, Ekwanoscutellum, Failleana,