- modioliform
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adj. [L. modiolus, a small measure or drinking vessel; forma, form]2. (MOLLUSCA: Bivalvia)Beaks are not terminal and anteroventral region forms a slight bulge; shell shaped like the genus modiolus.
Online Dictionary of Invertebrate Zoology. A.R. Maggenti and S.L. Gardne. 2005.