靴海果(學名:Cothurnocystis)是生活在奧陶紀海洋中的一類小而神秘的海果類。牠們的頭為靴狀,有三個尖尖的突出。邊緣骨板架形成了頭部的周邊,而中間部分是由小骨板組成。另外還有單獨的巨大鰓口,尾部短而柔軟。牠們可能利用尾拖着身體在海床上移動。[3][4]
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