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Plectostoma ikanensis Liew, Vermeulen, Marzuki & Schilthuizen, 2014
Nomenclature
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Family: DiplommatinidaeSubgenus: Plectostoma
SUMMARY
Description for shell form 5504
(Figs 17K and 34, and Appendix 14). Apex. Shape: moderately convex.
Spire. Height: 1.7 mm. Width: 1.3 mm. Number of whorls: 4 1/8–4 1/4. Apical spire shape: depressed conical. Basal spire shape: conical. Whorl periphery: distinctly convex. Umbilicus: open.
Constriction. Parietal teeth: none. Basal teeth: none
Tuba. Coiling direction: type 2 and aperture visible in right lateral view. Tuba whorl length in proportion to spire last whorl: ca.3/4–7/8. Proportion of tuba that attaches to spire: whole.
Aperture and peristome. Peristome: double peristomes. Outer peristome shape: similar to inner peristome, projected all around, except the posterior part, where left lateral sides are slightly more projected than the anterior and right lateral side.
Spiral lines. Thick lines: present. Thin lines: present.
Radial ribs. Rib density: 5 ribs per mm. Rib intensity: thin. Shape: straight. Inclination: orthoclin.
Description for shell form 5507
(Figs 17J and 35, and Appendix 11). Apex. Shape: moderately convex.
Spire. Height: 1.8–1.9 mm. Width: 1.3 mm. Number of whorls: 3 7/8–4. Apical spire shape: depressed conical. Basal spire shape: conical. Whorl periphery: distinctly convex. Umbilicus: open.
Constriction. Parietal teeth: none. Basal teeth: none.
Tuba. Coiling direction: type 2 and aperture visible in left lateral view. Tuba whorl length in proportion to spire last whorl: ca. 5/8. Proportion of tuba that attaches to spire: whole.
Aperture and peristome. Aperture with double peristome. Peristome: double peristomes. Outer peristome shape: similar to inner peristome, projected all around, except the posterior part, where left lateral sides are slightly more projected than the anterior and right lateral side.
Spiral lines. Thick lines: present. Thin lines: present.
Radial ribs. Rib density: 7 ribs per mm. Rib intensity: thin. Shape: straight. Inclination: orthoclin.