The presence of a part of the pre-Linnaean collection of Gualtieri is extremely important: the collection also includes materials from the Rumph’s one (bought by the Medici’s and then donated to Gualtieri himself).

On the drawings of the specimens (Index Testarum Conchyliorum) Linnaeus described many species, most of which are still valuable.

It is considered, on an international level, one of the main collection as for what concerns malacological systematic review.