sentences:  "Nematothallus" is widespread from the late Silurian, but similar cuticle is reported from the Caradoc epoch (late Ordovician, ).It is, however, difficult to distinguish "Nematothallus" cuticle from that of arthropods.Further work by Edwards and Rose has identified oval-shaped growths in places on the cuticles of a limited number of "Nematothallus" fragments, which develop into holes – whose purpose is unknown.