Describing the stages of normal development of Varanus indicus, the present paper provides the first developmental data on Varanidae. The incubation period is relatively long (180 days at 28°C) and without any diapause. The development is rather slow during the first 50 days, after which a considerable acceleration can be observed. The stage of accelerated growth terminates at app. 100 days when all essential specificities of adult organisation (prolonged narial region with vomeronasal organ, eyes, claws, large heart and robust body and limbs) are established. The remaining period of the embryonic development is characterized by continuation of the respective trends, i.e., enlarging body, prolongation of rostrum, enlarging teeth and claws, keratinisation of claws and scales etc. In short, the second half of the embryonic development of Varanus is devoted to refining the structures supporting its adaptations for active predation.
Embryonic development of Python sebae – I: Staging criteria and macroscopic skeletal morphogenesis of the head and limbs.
Early evolution of the venom system in lizards and snakes.
LemusD.IllanesJ.FuenzalidaM.Paz De La VegaY.GarciaM. (1981):
Comparative analysis of the development of the lizard, Liolaemus tenuis tenuis. II. A series of normal postlaying stages in embryonic development.
Histology of tooth attachment tissues and plicidentine in Varanus (Reptilia: Squamata), and a discussion of the evolution of amniote tooth attachment.
Embryonic development and aspects of reproductive biology in the Tuatara, Sphenodon punctatus. In:
Biology of the Reptilia 14: Development A p.
GansC.BillettF.MadersonP.F.A. Eds John Wiley & SonsNew York.
A developmental staging series for the lizard genus Anolis: a new system for the integration of evolution, development, and ecology.