Observations on Parthenogenesis in Monitor Lizards

Abstract. In this article I report observations on multiple parthenogenetic events in the Argus monitor (Varanus panoptes) in captivity. Two individually-housed females produced a total of 14 clutches of eggs in the absence of a male over a period of seven years. To date, 23 out of 69 eggs received from eight clutches have been incubated; all others eggs were noticeably infertile and discarded. Embryos developed in at least ten eggs; nine of which died shortly before hatching. Only one offspring successfully hatched and survived. Two non-surviving embryos showed cranial deformities. Also discussed are the different forms of parthenogenesis known to birds and reptiles, specifically highlighting the details of facultative  parthenogenesis in the genus of Varanus.