Tiny Snails All Over

[Myka]

What do they look like? Pyramidellid snails are parasitic; you would find them on bigger snails or clams. Rissoids are harmless, and look a lot like Pyramidellids, do a Google to figure out the difference. Sundial snails are parasitic to Zoanthids and and a little pyramid-shaped trapdoor cover over the opening of their shell when they suck themselves in. Collonista snails look a bit like Sundial, but are harmless and related to Turbo snails.