page_title: Amphicyclotulus amethystinus
section_title: Shell description
hierarchical_section_title: Amphicyclotulus amethystinus / Shell description
caption_attribution_description: English: Photo of apertural view of the shell of Amphicyclotulus amethystinus. Width of the shell is 14.1 mm.
context_page_description: Amphicyclotulus amethystinus is a species of tropical land snail with a gill and an operculum, a terrestrial gastropod mollusk in the family Neocyclotidae.
context_section_description: The shell is smooth, shining, not striate spirally, generally somewhat more depressed, deep chestnut or reddish brown. Whorls are a little flattened near the suture. The species may have subtle spiral striation, although there exists considerable variation; axial growth lines are clearly visible.
  The operculum is horny, diaphanous, concave externally, cartilaginous within, the nucleus projecting internally; with from ten to fourteen very narrow whorls, their rather lamellar outer edges slightly free.
  Amphicyclotulus amethystinus has spiral threads absent or only weakly present. There are found only two species in the genus Amphicyclotulus in Dominica. The other species is Amphicyclotulus dominicensis and it has spiral cords clearly present and raised.
  Robert John Lechmere Guppy (1868) noted that this species is not found above 1000 m. Although he recognized two “forms”, he did not recognize two separate species. George French Angas (1884) subsequently recorded “Cyclophorus amethystinus” from altitudes above 1200 m. Paul Bartsch (1942) restricted the name amesthystinus to Guppy’s var. β, the “smooth, shining, not striate spirally” form.
caption: Apical view of the shell. Width of the shell is 14.1 mm.
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