Pillar snails have a notable shape – a bit like a grain of rice. The three species of Pillar snails found in Indiana are easily distinguished from other land snails by their size (~ 5-7 mm diameter), columnar/conical shell, and lack of apertural teeth, and general form. The apertural lip is not reflected but is thickened slightly (callused).
The Appalachian Pillar has a thinner callus rim and is more elongate and narrower than the Glossy or Thin Pillars. The Thin Pillar is the smallest of the three (4.5-7 mm diameter), while the Glossy Pillar overlaps both (5-7.5 mm).
1a. The edge of apertural lip thicker (callused), shell more elongate (6.6-7.2 mm diameter) and narrow; taller and browner - Appalachian Pillar (C. moreseana)
1b. The edge of apertural lip thinner, shell mostly less elongate (4.5-7.5 mm diameter) and wider – (2)
2a. Smaller specimens (4.5-6.8 mm diameter), relatively smaller and more cylindrica – Thin Pillar (C. lubricella)
2b. Larger specimens, “robust” shell (5-7.5 mm diameter) – Glossy Pillar (C. lubrica)
All three Pillar snails are described in Dourson (2015) and at Land Snails and Slugs of the Mid-Atlantic and Northeastern United States (Hotopp et al. 2013).