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Nephila senegalensis annulata
Colourful orb web spider, Not sure about the species so any help would be appreciated. Found in my garden.
Colouring of Orb Web Spiders: Interesting
The waste substances are chemically converted to harmless crystals and are stored in special cells. These white colored guanocytes are located in-groups and can be seen through the skin. This shows up as a very special pattern on the back of the orb weaving spiders.
http://ednieuw.home.xs4all.nl/Spiders/In...
I'm not an expert on spiders but I believe this is Nephila senegalensis because of the yellow leg bands. There appears to be a number of sub species throughout Africa and our southern Africa one is N. senegalensis annulata