Armiger crista, commonly known as the Nautilus ramshorn, is a minute species of freshwater snail, an aquatic pulmonate gastropod mollusk in the family Planorbidae, the ram's horn snails. == Distribution == The distribution of this species is Holarctic (spread across the northern part of the whole northern hemisphere).
Armiger crista, commonly known as the Nautilus ramshorn, is a minute species of freshwater snail, an aquatic pulmonate gastropod mollusk in the family Planorbidae, the ram's horn snails. == Distribution == The distribution of this species is Holarctic (spread across the northern part of the whole northern hemisphere).
Source: Wikipedia "Armiger crista" · CC BY-SA 4.0
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