In 1907, Curtis Gates Lloyd described the new genus Pseudocolus, and reduced several species to synonyms of Pseudocolus fusiformis.
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The first appearance of the type species, Pseudocolus fusiformis, in the literature was in 1890, under the name Colus fusiformis, when Eduard Fischer wrote a description based on a painting he found in the Paris Museum of Natural History.
In 1907, Curtis Gates Lloyd described the new genus Pseudocolus, and reduced several species to synonyms of Pseudocolus fusiformis.