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Home » Taxon Pages » Animalia » Mollusca » Gastropoda » Caenogastropoda » Architaenioglossa » Cyclophoroidea » Diplommatinidae » Plectostoma » Plectostoma tonkinianum (Dautzenberg & Fischer, 1905) -
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Plectostoma tonkinianum (Dautzenberg & Fischer, 1905)
Nomenclature
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Family: DiplommatinidaeSubgenus: Plectostoma
Species:
Plectostoma tonkinianum (Dautzenberg & Fischer, 1905)
SUMMARY
Apex. Shape: distinctly convex.
Spire. Height: 3.1–3.8 mm. Width: 2.4–2.6 mm. Number of whorls: 4 3/4–4 7/8. Apical spire shape: depressed conical. Basal spire shape: ovoid. Whorl periphery: distinctly convex. Umbilicus: completely closed by tuba.
Constriction. Parietal teeth: two lamellae. Basal teeth: none.
Tuba. Coiling direction: type 3 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. Peristome: simple peristome.
Spiral lines. Thick lines: absent. Thin lines: present.
Radial ribs. Rib density: 6–7 ribs per mm. Rib intensity: thin. Shape: slightly curved to single-humped. Inclination: orthoclin.