Marzola M., Russo J., & Mateus O. (2014). Identification and comparison of modern and fossil crocodilian eggs and eggshell structures. Historical Biology, ahead-of-print, 1-19.
Identification and comparison of modern and fossil crocodilian eggs and eggshell structures.
The eggs of three modern crocodilian species, the Philippine Crocodile, Cuvier’s Smooth-fronted Caiman or Musky Caiman, and American Alligator or Common Alligator, were examined in detail to gain a better understanding of anatomy and microstructure to improve identification. The observations began with the ornamentation of the outer surface and continued to the microscopic structure of the eggshell. This led to interesting patterns from current to fossil Crocodylomorpha eggs since the Jurassic period and identification of a previously unknown egg ornamentation, the rugosocavate type. One shared characteristic between crocodiles and some groups of dinosaurs and birds is the pore system, called angusticaniculate, made of straight and subcircular pores.