Dillwynella texanaDillwynella texana is an extinct species of sea snail, a marine gastropod mollusk in the family Skeneidae.DescriptionThe shell contains four spiral, smooth, and shining whorls. The body whorl is nearly smooth but shows a slight tendency to bear furrows or lines radiating from the suture. The umbilicus is small. The aperture is round.DistributionThis marine species was found as a fossil in the Lower Claiborne Eocene, Texas.