''Juga silicula'', common name glassy juga, is a small, freshwater snail found lotic water in Washington, Oregon, and northern California. It is dark reddish-brown in color with an ovate operculum and about 3.5 whorls. Strong, E. E. (2005). A morphological reanalysis of Pleurocera acuta Rafinesque, 1831 and Elimia livescens (Menke, 1830)(Gastropoda: Cerithioidea: Pleuroceridae). Nautilus. Historically, ''J. silicula'' was abundant in its range. Poteet, M. F. (2006). Shifting roles of abiotic and biotic regulation of a multi-host parasite following disturbance. Disease Ecology. Oxford University Press, New York, 135-153. It is currently considered a species of concern in Washington due to limited range, habitat degradation and anthropogenic factors. Johannes, E. J. (2010). Freshwater mollusks found during a survey for Potamopyrgus antipodarum (New Zealand mudsnail) within a five-mile radius of Capitol Lake, Thurston County, Washington. The Dredgings, 50, 3-5. ''J. silicula'' acts as a first intermediate host for the trematode parasite '' Cephalouterina dicamptodoni''.

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{{Taxonbar, from=Q10541084 Semisulcospiridae Gastropods described in 1847