Ramshorn Snails and Allies

Range

Greener is more native, amber more introduced; paler is less certain. How this was decided

• Marsh Ramshorn Planorbella trivolvis 8,381 observations
• Two-ridged Ramshorn Helisoma anceps 443 observations
• Ash Gyro Gyraulus parvus 228 observations
• Creeping Ancylid Ferrissia rivularis 151 observations
• American Lake Limpet Ferrissia californica 143 observations
• Dusky Ancylid Laevapex fuscus 116 observations
• Thicklip Ramshorn Planorbula armigera 107 observations
• Sharp Sprite Promenetus exacuous 56 observations
• Great Basin Ramshorn Helisoma newberryi 46 observations
• Flexed Gyro Gyraulus deflectus 42 observations
• Disc Gyro Gyraulus circumstriatus 30 observations
• Rough Ramshorn Planorbella subcrenata 24 observations
• Borax Lake Rams-horn Planorbella oregonensis 17 observations
• Mexican Ramshorn Planorbella tenuis 6 observations
• Coarse Ramshorn Planorbella binneyi 2 observations