Pila gracilis

The height of the shell varies between 35 mm and 40 mm.

(Original description in Latin) The shell is regularly elliptical and yellowish-olive, transversely banded throughout. It is rather thin, narrowly umbilicate, smooth, and shiny. The spire is emergent, and the sutures are slightly impressed. The shell contains about six somewhat convex whorls. The aperture is ovate, dark brown internally, and obsoletely banded. The outer lip is acute, the umbilicus is strongly compressed, and the columella is smooth.^[2]

• Reeve, L.A. (1856). Monograph of the genus Ampullaria. In: Conchologia Iconica, or illustrations of the shells of molluscous animals, vol. 10,. London: Reeve & co. Retrieved 1 June 2025.
• Ng, T. H.; Annate, S.; Jeratthitikul, E.; Sutcharit, C.; Limpanont, Y.; Panha, S. (2020). "Disappearing apple snails (Caenogastropoda: Ampullariidae) of Thailand: a comprehensive update of their taxonomic status and distribution". Journal of Molluscan Studies.{{cite journal}}: CS1 maint: multiple names: authors list (link)
• Brandt, R.A.M. (1974). "The non-marine aquatic Mollusca of Thailand" (PDF). Archiv für Molluskenkunde. 105 (i–iv): 51. Retrieved 1 June 2025.

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