In my opinion Alveolinoidea superfamily members are the most difficult group, since studying both isolated form as well as axial, equitorial and tangential cuts in thin sections plus in some groups such as Alveolinidae family, biometry of specimen are needed to determine them into species level. Also the number of species assigned to this group is so high and morphologies are so diverse among Fabulariidae, Rhapydioninidae, Globoreticulinidae , and Alveolinidae that demands years of work to gain experty on all these families or at least one of them.