Amphicyclotus
Amphicyclotus is a genus of tropical land snails with gills and an operculum, terrestrial gastropod mollusks in the family Neocyclotidae.
Amphicyclotus is the type genus of the family Neocyclotidae.
Characteristics
The shell is broadly and deeply umbilicate, globose-turbinate, and subdepressed. The aperture is nearly circular, exhibiting minimal angulation near the insertion point. The peristome is simple and non-reflected, with edges joined by a variable callus deposit. The columellar edge is poorly developed externally, while the basal and outer edges are thin and sharp, slightly thickened internally.
The operculum is orbicular, corneous, and variably thick, thinning towards the edge. It is slightly concave externally, with numerous tightly coiled whorls, particularly concentrated centrally where they constrict. The whorl edges are slightly salient and nearly free. The inner surface is glossy, thickened centrally, resembling an obtuse, flattened nipple.
The radula resembles that of Tomocyclus. The central tooth is subtrapezoidal, slightly arched basally, slightly narrowed medially, and tricuspid with short cusps on its reflected edge. The lateral tooth is elongated, attenuated basally, oblique, and tricuspid, with a dominant median cusp. The inner marginal tooth is arched and tricuspid. The outer marginal tooth is contoured, tricuspid, with a narrow, weaker inner cusp.
Species
Species within the genus Amphicyclotus include:
Synonyms
Amphicyclotus acutiliratus : synonym of Amphicyclotus rufescens : synonym of Amphicyclotulus rufescens Amphicyclotus amethystinus : synonym of Amphicyclotulus amethystinus Amphicyclotus beauianus : synonym of Amphicyclotulus beauianus Amphicyclotus bourcieri : synonym of Calaperostoma bourcieri Amphicyclotus cayennensis : synonym of Neocyclotus cayennensis Amphicyclotus chanchapoyasensis S. I. Da Costa, 1906: synonym of Calaperostoma chanchapoyasense Amphicyclotus cousini : synonym of Calaperostoma cousini Amphicyclotus crosseanus : synonym of Lagocyclus crosseanus Amphicyclotus cumingi : synonym of Calaperostoma cumingii Amphicyclotus cumingii : synonym of Calaperostoma cumingii Amphicyclotus delphinulus : synonym of Filocyclus delphinulus Amphicyclotus disjunctus : synonym of Cyclopomops moricandi Amphicyclotus esmeraldensis : synonym of Calaperostoma esmeraldense Amphicyclotus goldfussi : synonym of Amphicyclotus texturatus goldfussi Amphicyclotus guayaquilensis : synonym of Calaperostoma guayaquilense Amphicyclotus haematomma : synonym of Lagocyclus haematomma Amphicyclotus hidalgoi : synonym of Calaperostoma hidalgoi Amphicyclotus liratus : synonym of Amphicyclotulus martinicensis Amphicyclotus lutescens : synonym of Mexcyclotus lutescens Amphicyclotus moricandi : synonym of Cyclopomops moricandi Amphicyclotus nigrofasciatus : synonym of Calaperostoma bourcieri Amphicyclotus olssoni Pilsbry, 1926: synonym of Calacyclotus olssoni Amphicyclotus orbignyi : synonym of Calaperostoma orbignyi Amphicyclotus psilomitus : synonym of Liracyclotus psilomitus Amphicyclotus purus : synonym of Calaperostoma purum Amphicyclotus rosenbergi : synonym of Calaperostoma rosenbergi Amphicyclotus rufescens : synonym of Amphicyclotulus rufescens Amphicyclotus schrammi : synonym of Amphicyclotulus schrammi Amphicyclotus underwoodi : synonym of Barbacyclus underwoodi Amphicyclotus vasconesi : synonym of ''Lagocyclus vasconesi''