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Myrmeleontidae
Looks like a giant dragonfly with blotched wings and large ovipositors. It is nocturnal
From Bug Guide, antlions and owlflies are very closely related. They look very much alike, identification is not easy. I have spotted antlions too and have read about lacewings. Owlfly seems fit.
Thanks for the suggestions!
Antlion or Owlfly, not sure what species you have in Nigeria. Here are some photos of antlions from the U.S.: http://bugguide.net/node/view/137/bgimag...