Turbonilla dalli

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Turbonilla dalli
Turbonilla dalli 001.png
Drawing of a shell of Turbonilla dalli
Scientific classification
Kingdom:
Animalia
Phylum:
Mollusca
Class:
Gastropoda
(unranked):
clade Heterobranchia
clade Euthyneura
clade Panpulmonata
Superfamily:
Pyramidelloidea
Family:
Pyramidellidae
Subfamily:
Turbonillinae
Genus:
Turbonilla
Species:
T. dalli
Binomial name
Turbonilla dalli
Bush, 1899 [1]
Synonyms

Chemnitzia dalli (Bush, 1899)

Turbonilla dalli, common name the Dall's turbonille, is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies. [2] [3]

Contents

Description

This is a large, stout, regularly coiled shell. It is bluish white, semitransparent with a dull lustre. Its length varies between 5 mm and 13 mm. The suture is unusually deep, but not channeled. The prominent protoconch contains two projecting whorls transverse to the axis. The twelve whorls of the teleoconch are very convex. The 16 transverse ribs are often opaque white, very prominent, and slightly oblique. They are separated by very deep, concave, about equally wide spaces, which terminate in clean, square-cut ends, sometimes just above the suture. The base of the shell is short, moderately convex and smooth. The aperture is squarish. The outer lip is thin, greatly expanded, and turning in abruptly to meet the straight, much thickened, not reflected, columellar lip in a rounded angle. The entire surface is covered with exceedingly fine microscopic striae. [1]

Distribution

Fossil, Pliocene Turbonilla dalli 01.jpg
Fossil, Pliocene

This marine species occurs in the following locations at depths between 0 m and 6 m: [2]

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References

  1. 1 2 K.J. Bush (1899), Descriptions of New Species of Turbonilla of the Western Atlantic Fauna, with Notes on Those Previously Known; Proceedings of the Academy of Natural Sciences of Philadelphia, Vol. 51, No. 1 (Jan. - Mar., 1899), pp. 169
  2. 1 2 Rosenberg, G. (2011). Turbonilla dalli Bush, 1899. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=420483 on 2012-03-01
  3. ↑ Rosenberg, G., F. Moretzsohn, and E. F. García. 2009. Gastropoda (Mollusca) of the Gulf of Mexico, Pp. 579–699 in Felder, D.L. and D.K. Camp (eds.), Gulf of Mexico–Origins, Waters, and Biota. Biodiversity. Texas A&M Press, College Station, Texas.
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