Verticillus n. : A whorl; a verticil.

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Taxonomy
Aegopis verticillus, clade, free encyclopedia, informal group, species, family, search, Kingdom, Phylum, unranked, Superfamily, Genus, Pulmonata, Zonitidae, air-breathing, land snail, Europe, Personal tools.

Defination from the web:
verticillus. Binomial name. Aegopis verticillus (Lamarck, 1822) Aegopis verticillus. Aegopis verticillus is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Zonitidae. ...