Carl Jonas Pfeiffer
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Carl Jonas Pfeiffer was a German merchant, banker, and amateur malacologist.
Carl's banking interests would eventually become Bankgeschäft L. Pfeiffer and flourish under family directorship for four generations
Lithoglyphus naticoides
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Lithoglyphus naticoides, the gravel snail, is a species of small or minute freshwater snail with an operculum, an aquatic gastropod mollusk in the family Lithoglyphidae.
Outline drawing of a shell of Lithoglyphus naticoides and its operculum