Search Results for: Flat fish
. --> ancylini (planorbidae) drop-shaped shell: heavy, drop-shaped shell, often with colourful pattern. small, non-concentric operculum (shell door grows at the side of the columella, not at all sides) --> neritidae discoidal shell (flat, all whorls in one plane): operculum present, shell size often
lakes). - segmentini with genera: segmentina (europe and northern asia), hippeutis (europe and northern asia), lentorbis (tropical africa), polypylis (east asia) and helicorbis (east asia). - ancylini with one genus: ancylus (north america, northern europe and northern asia). most planorbidae have a flat...
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