Have anyone observed Nassarius shell with periostrecum? I have found a Nassarius shell with fibrous outer surface or periostrecum, and not observed in any other Nassarius in my collection!
Absolutely, like Nassarius wolffi, Nassarius frigens, Nassarius reticulatus, Nassarius denticulatus, Nassarius webbei. It is common in Nassarius with roughly corrugated sculpture. What species are we dealing with in your case, can you show a ventral view?