An ootheca /oʊ.əˈθiːkə/ (pl.: oothecae /oʊ.əˈθiːsiː/) is a type of egg capsule made by any member of a variety of species including mollusks (such as Turbinella laevigata), mantises, and cockroaches.[1][2][3]
Turbinella
was invoked but never defined (see the help page).