land gastropods reach a maximum of biodiversity  in Turkey
... that several families of land gastropods reach a maximum of biodiversity in Turkey?
... that several families of <b id="mwGkg"><a href="./List_of_non-marine_molluscs_of_Turkey" id="mwGkk" rel="mw:WikiLink" title="List of non-marine molluscs of Turkey">land gastropods reach a maximum of biodiversity  in Turkey</a></b>?