rotaliform
/rəʊˈteɪlɪfɔːm/Zoology and Palaeontology
adjective
Having or relating to a test or shell of a globular spiral form typical of many rotalids, in which the earlier, smaller chambers are hidden on one side by the larger, later chambers; designating a test of this form.
Origin
Mid 19th century; earliest use found in Philosophical Transactions of the Royal Society of London. From scientific Latin Rotalia + -form.