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Taxon Pages
Plectostoma christae (Maassen, 2001)
Nomenclature
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Family: DiplommatinidaeSubgenus: Plectostoma
Media
SUMMARY
Apex. Shape: moderately convex.
Spire. Height: 1.9–2.6 mm. Width: 1.4–1.8 mm. Number of whorls: 3 5/8–4 1/2. Apical spire shape: depressed conical. Basal spire shape: ovoid. Whorl periphery: distinctly convex. Umbilicus: open.
Constriction. Parietal teeth: two. Basal teeth: none.
Tuba. Coiling direction: type 1 and aperture visible from left lateral view. Tuba whorl length in proportion to spire last whorl: ca. 3/8–5/8. Proportion of tuba that attaches to spire: whole.
Aperture and peristome. Peristome: double peristomes. Outer peristome shape: same as inner peristome and uniformly projected all around, except the posterior part.
Spiral lines. Thick lines: absent. Thin lines: present.
Radial ribs. Rib density: 5–6 ribs per mm. Rib intensity: thin. Shape: straight. Inclination: orthoclin.