A hydrobiid snail (probably Fontigens sp.) from sediments in an Missouri cave. Total length: 2.5 mm. Photo by Steve Taylor, 2000. A specimen of Fontigens antroecetes (Hubricht 1940) (Ctenobranchiata: Hydrobiidae), with finger tip for scale, in an Illinois cave. Photo by Steve Taylor, 2004. This species, a troglobite (or stygobite), is currently (early 2004 [in case I forget to update this!]) being considered for inclusion on the Illinois threatened and endangered species list, in part because it occurs in only one cave in Illinois. It is not being considered for federal listing. It is known from about 12 caves in Missouri. [Go Back to Cave Critters] Illinois Natural History Survey This page is maintained by Steve Taylor. Please email sjtaylor@inhs.uiuc.edu with comments and corrections. Created 21 January 2001, last modified 22 February 2006.