Intraspecific variation in Black Caiman (Melanosuchus niger) embryonic development

Steps in the embryonic development of crocodilians are usually species-specific, highlighting the plasticityof the process. Herein we describe intraspecific variation in the growth of embryos in three Black Caiman(Melanosuchus niger) nests monitored in situ in the Central Brazilian Amazon. Nests differed in which embryonic stagesthe first increases in total length and mass occurred. Differences from a previous study of the same species included thetiming of morphological characteristics such as the closure of the abdominal wall. Therefore, our data are indicative of theplasticity of embryonic development of Black Caimans in natural conditions.