Life stages of Fontigens antroecetes observed under simulated cave conditions in the laboratory a egg capsule containing two-day old embryo at the four-celled stage b well developed embryo at 75 days development c newly hatched snail d adult lab raised individual. Scale bars represents approximately 1 mm.

 
 
  Part of: Weck RG (2022) Life history observations of the Illinois state endangered Enigmatic Cavesnail, Fontigens antroecetes (Hubricht, 1940) made under simulated cave conditions. Subterranean Biology 43: 185-198. https://doi.org/10.3897/subtbiol.43.87277