The black girdled lizard, Cordylus niger, is a medium-sized lizard restricted to Table Mountain on the Cape Peninsula and a second, isolated population near Langebaan.
This has taken place mainly on False Bay from the naval base at Simon's Town, but there have also been regular outings to bodies of water elsewhere in the region, including the Berg and Breede Rivers, Langebaan and Hermanus lagoons, and the Atlantic ocean in the vicinity of Cape Point.
The Duivenhoks River at Heidelberg was named by Schrijver, and "Schrijvershoek" near Langebaan lagoon was named after him.