Jackson lake springsnail
 The Jackson lake springsnail scientific name Pyrgulopsis robusta is a species of very small or minute freshwater snail with an operculum an aquatic gastropod mollusk in the family Hydrobiidae. This species is endemic to the United States. The shell is 4.6 to 7.5 millimetres (0.18 to 0.30 in) high and 1.48 to 2.10 millimetres (0.058 to 0.083 in) wide which is large for this genus. It has 4.5 to 6.25 whorls and is clear-white with a tan periostracum.