Syntomodrillia inadrinaSyntomodrillia inadrina is an extinct species of sea snail, a marine gastropod mollusk in the family Drilliidae.DescriptionThe length of the shell attains 6.6 mm, its diameter 2.2 mm.DistributionThis extinct species occurred in Miocene strata for 15.97 to 11.608 Ma years ago, of Trinidad and Tobago.