PCI network card slot for Shuttle SD31P?

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I want to get wireless/wired PCI network card for my shuttle Sd31P but there is no slot that looks like PCI. There is PCI-E slot for Graphics card and another really tiny slot, which looks nothing like PCI and just too small to fit any card.

help plz.

 

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Just had a little read and the little tiny slot is called PCI-E Ethernet, do they even make this wirelessly or infact wired.