Heloplax is a genus of worm-like molluscs.

Its soft parts are preserved in three dimensions in the Silurian Herefordshire Lagerstatte; its disarticulated valves are known from other Silurian deposits.

[1] It is very bizarre by modern standards; it bears serially repeated units, and has spines.

It probably falls somewhere between the aplacophorans and polyplacophora; its valves were composed of aragonite[1]

This Chiton-related article is a stub.