Tomocyclus is a genus of land snails, terrestrial gastropod mollusks in the subfamily Megalomastomatinae of the family Megalomastomatidae.MolluscaBase eds. (2022). MolluscaBase. Tomocyclus Crosse & P. Fischer, 1872. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=995577 on 2022-10-01
Description (Original description in Latin) The shell is perforated, turreted, and truncated. The aperture is subcircular and small. The peristome is double-layered: the inner layer is briefly projected inward, while the outer layer is broadly expanded, resembling a leaf. The upper margin of the outer lip is interrupted, with a unique, incised, and hollowed-out appearance.
The operculum is circular, corneous but relatively thick, and spirally wound. It is slightly flattened anteriorly and reinforced posteriorly by a blunt, rounded process. The margins of the operculum exhibit a somewhat lamellar structure.
Species Tomocyclus fistulosus F. G. Thompson, 1963 Tomocyclus gealei Crosse & P. Fischer, 1872 Tomocyclus guatemalensis (L. Pfeiffer, 1851) Tomocyclus lunai Bartsch, 1945 Tomocyclus simulacrum (Morelet, 1849) Synonyms Tomocyclus constrictus Bartsch & J. P. E. Morrison, 1942: synonym of Tomocyclus simulacrum (Morelet, 1849) (junior synonym) Tomocyclus copanensis (G. B. Sowerby I, 1850): synonym of Tomocyclus simulacrum (Morelet, 1849) (junior synonym) Tomocyclus siphonis Bartsch & J. P. E. Morrison, 1942: synonym of Tomocyclus simulacrum (Morelet, 1849) (junior synonym)
References
Bank, R. A. (2017). Classification of the Recent terrestrial Gastropoda of the World. Last update: July 16, 2017
External links Kobelt W. (1902). Das Tierreich. Eine Zusammenstellung und Kennzeichnung der rezenten Tierformen. 16. Lieferung. Mollusca. Cyclophoridae. Das Tierreich. XXXIX + 662 pp., 1 map