Vertigo milium

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Vertigo milium
Vertigo milium shell 2.jpg
Drawing of a shell of Vertigo milium
Scientific classification Red Pencil Icon.png
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
Subclass: Heterobranchia
Order: Stylommatophora
Family: Vertiginidae
Subfamily: Vertigininae
Genus: Vertigo
Species:
V. milium
Binomial name
Vertigo milium
(Gould, 1840)
Synonyms
  • Angustula milium(A.A. Gould, 1840)
  • Pupa miliumGould, 1840
  • Vertigo (Alaea) milium(A. Gould, 1840) · alternate representation
  • Vertigo (Angustula) milium(A. Gould, 1840)

Vertigo milium, common name the blade vertigo, is a species of minute air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Vertiginidae, the whorl snails. [1]

Contents

The variety Vertigo milium var. antillarumPilsbry, 1934 is a taxon inquirendum.

Shell description

The shell is small, subcylindrical, smooth shining. Growth lines are very fine, a little oblique. Apex is smooth. The color of the shell is dark chest-nut. The shell has 5 rounded whorls, that are somewhat regularly increasing and decreasing to a bluntly rounded apex. Sutures are impressed. [2]

The aperture is obscurely semicircular, lateral and truncated above. The "circumference" of the aperture is "made up of two curves of different radius uniting in the peristome, where the junction causes an angle projecting inwards, the smaller curve comprising about one-fourth part and forming the superior portion of the peristome. The aperture has six teeth as follows: two sharp, projecting teeth of about equal size placed on the parietal wall and dividing that region into three nearly equal parts; one on the columella, large, massive, broad; a third placed on the outer lip above or at the junction of the two radii, long, curved, ridge-like, pointing directly between the two parietal teeth; a fourth on the base of the lip, small, conical, tubercular; and one large, entering, elevated, long lamina, which begins on the base of the lip and curves backward until it disappears behind the columella tooth (this is the "gular lamina" of Sterki). Peristome is white or brownish-white, reflected, the terminations separated, but joined by a prominent callus. The umbilicus is well marked, open, deep. Base of the shell is rounded. [2]

The width of the shell is 0.80–0.90 mm. The height of the shell is 0.90–1.40 mm. The height of aperture is 0.25–0.30 mm. [2]

Anatomy

The animal is similar in form to the other species of Vertigo. The color is dirty white, darker on the upper surface. The foot is very broad, posterior of the center, from whence it tapers rapidly to a point. The foot is thick and fleshy and well able to support the light shell. Eye-peduncles are of medium length, somewhat enlarged at the tips, where the eyes are placed. [2]

The jaw is very slightly arcuate, the ends a trifle rounded. Concave margin is notched and anterior surface lightly striated. The jaw is of equal width throughout its length. [2]

The formula of the radula is like this: 277 + 4⁄2 + 1⁄3 + 4⁄2 + 277

Teeth are as in the other members of the genus. There are four perfect lateral teeth and the first marginal tooth is similar but with a second outer cusp. From this point the marginals become wider, the inner cusp remains always the larger, and the outer cusp develops from five to seven small cusps or denticles. [2]

Distribution

Distribution of Vertigo milium include Illinois, [3] Maine to Minnesota, Ontario and Quebec, Canada, to Florida and Texas, [4] USA. [2]

Habitat

Baker (1902) [2] described habitat like this: "Gregarious. Found plentifully under leaves, stones and sticks, in moist situations."

Related Research Articles

<span class="mw-page-title-main">Aperture (mollusc)</span> Main opening of the shell, where the head-foot part of the body of the animal emerges

The aperture is an opening in certain kinds of mollusc shells: it is the main opening of the shell, where the head-foot part of the body of the animal emerges for locomotion, feeding, etc.

<i>Vertigo arctica</i> Species of gastropod

Vertigo arctica is a species of minute air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Vertiginidae, the whorl snails.

<i>Amphigyra</i> Genus of gastropods

Amphigyra is a genus of air-breathing freshwater snail, an aquatic pulmonate gastropod mollusk in the family Planorbidae, the ram's horn snails.

Vertigo dedecora is a species of very small air-breathing land snail, a terrestrial pulmonate gastropod mollusk or micromollusk in the family Vertiginidae.

<i>Vertigo substriata</i> Species of mollusc

Vertigo substriata is a species of minute air-breathing land snail, a terrestrial pulmonate gastropod mollusk or micromollusk in the family Vertiginidae, the whorl snails.

<i>Vertigo pygmaea</i> Species of gastropod

Vertigo pygmaea, common name the "crested vertigo", is a species of minute air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Vertiginidae, the whorl snails.

<i>Vertigo ronnebyensis</i> Species of gastropod

Vertigo ronnebyensis is a species of minute air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Vertiginidae, the whorl snails.

<i>Vertigo alpestris</i> Species of gastropod

Vertigo alpestris is a species of minute, air-breathing land snail, terrestrial pulmonate gastropod molluscs or micromollusks in the family Vertiginidae, the whorl snails.

<i>Vertigo antivertigo</i> Species of gastropod

Vertigo antivertigo is a species of minute air-breathing land snail, a terrestrial pulmonate gastropod mollusc or micromollusc in the family Vertiginidae, the whorl snails.

<i>Vertigo bollesiana</i> Species of gastropod

Vertigo bollesiana, common name the delicate vertigo snail, is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Vertiginidae, the whorl snails.

<i>Vertigo lilljeborgi</i> Species of gastropod

Vertigo lilljeborgi is a species of minute land snail, a terrestrial pulmonate gastropod mollusk or micromollusk in the family Vertiginidae, the whorl snails.

<i>Vertigo modesta</i> Species of gastropod

Vertigo modesta, common name the cross vertigo, is a species of minute air-breathing land snail, a terrestrial pulmonate gastropod mollusk or micromollusk in the family Vertiginidae, the whorl snails.

<i>Ringicella ringens</i> Species of gastropod

Ringicella ringens is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Odontostomidae.

<i>Sculptaria</i> Genus of gastropods

Sculptaria is a genus of small air-breathing land snails, and terrestrial pulmonate gastropod mollusks in the superfamily Plectopyloidea.

<i>Hyperaulax ridleyi</i> Species of gastropod

Hyperaulax ridleyi is a species of tropical air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Odontostomidae.

<i>Gibbula multicolor</i> Species of gastropod

Gibbula multicolor, common name the multicoloured topshell, is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.

<i>Halistylus columna</i> Species of gastropod

Halistylus columna is a species of small sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.

Clanculus gemmulifer is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.

<i>Clanculus personatus</i> Species of gastropod

Clanculus personatus, common name the masked clanculus, is a species of sea snail, a marine gastropod mollusk in the family Trochidae, the top snails.

Eucithara hirasei is a small sea snail, a marine gastropod mollusk in the family Mangeliidae.

References

This article incorporates public domain text from reference. [2]

  1. ↑ MolluscaBase eds. (2023). MolluscaBase. Vertigo milium (A. Gould, 1840). Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=1065107 on 2023-02-10
  2. 1 2 3 4 5 6 7 8 9 Baker F. C. (25 April) 1902. The Mollusca of the Chicago Area. Part II. Gastropoda. Bulletin No. III. of the Natural History Survey, The Chicago Academy of Sciences, 418 pp. 33 plates, page 241–242.
  3. ↑ Coppolino M.L. 2009. Land Snails of Southern Illinois. Southern Illinois University, Carbondale, Illinois, USA. Last updated 31 January 2009. Accessed 19 July 2009.
  4. ↑ Kathryn E. Perez. (last edited September 12, 2006) Land Snail List for Texas Archived April 30, 2009, at the Wayback Machine . accessed 25 June 2009.
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