Gelenoptron tentaculatum is an extinct, cnidarian-like organism represented by a single specimen and counterslab from the Burgess Shale.

The holotype of G. tentaculatum was originally identified as a second specimen of the Animalia incertae sedis, Redoubtia, but established as a separate genus by Simon Conway Morris in 1993.

A reflective shield recalls the float of chondrophore hydrozoans.

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