ID Confirmed by Prof. Lech Borowiec, Poland.
http://www.cassidae.uni.wroc.pl/katalog%20internetowy//conchylocteniafibrata.htm
Found on goat's rue in sand prairie remnant at Harry N. Patterson Savanna Land and Water Reserve.
It looks big in the picture but it was like 1 cm. ID is a guess but it was definitely a jumping spider.