Turbonilla canadensis

Turbonilla canadensis
	Drawing of a shell of Turbonilla canadensis
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. canadensis
Binomial name
	Turbonilla canadensis; Bartsch, 1917 [1]
Synonyms
	Turbonilla (Strioturbonilla) canadensis Bartsch, 1917

Turbonilla canadensis is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.[2][3]

Description

The yellowish white shell is slender and has an elongate-conic shape. Its length measures 6.3 mm. The 2½ whorls of the protoconch are small, and depressed helicoid. Their axis is at right angles to that of the succeeding turns, in the first of which they are about one-fourth immersed. The 11 whorls of the teleoconch are almost flattened, and situated rather high between the sutures. They are appressed at the summit. They are marked by quite regular, slightly curved, protractive, axial ribs, of which 14 occur upon the first, 16 upon the second and third, 18 upon the fourth to seventh, 20 upon the eighth, and 22 upon the ninth and the penultimate turn. The intercostal spaces are not quite as wide as the ribs. They are deeply impressed, terminating at the periphery, which is decidedly angulated. There is a smooth space between the periphery and the succeeding whorl, which falls at some little distance anterior to the periphery of the preceding turn. This gives the whorls a somewhat overhanging appearance. The suture is well constricted. The base of the shell is short, well rounded, its entire surface marked by microscopic striations. The aperture is subquadrate. The posterior angle is obtuse. The outer lip is thin. The inner lip is slightly curved and somewhat revolute.[1]

Distribution

The type specimen of this marine species was found off Forrester Island, Alaska.

References

P. Bartsch (1917), Descriptions of new west American marine mollusks and notes on previously described forms; Proceedings of the United States National Museum, vol.52; ISSN 0096-3801
Rosenberg, G. (2011). "Turbonilla canadensis Bartsch, 1917". World Register of Marine Species. Retrieved 2012-03-01.
Turgeon, D.; Quinn, J.F.; Bogan, A.E.; Coan, E.V.; Hochberg, F.G.; Lyons, W.G.; Mikkelsen, P.M.; Neves, R.J.; Roper, C.F.E.; Rosenberg, G.; Roth, B.; Scheltema, A.; Thompson, F.G.; Vecchione, M.; Williams, J.D. (1998). Common and scientific names of aquatic invertebrates from the United States and Canada: mollusks. 2nd ed. American Fisheries Society Special Publication, 26. American Fisheries Society: Bethesda, MD (USA). ISBN 1-888569-01-8. IX, 526 + cd-rom pp.

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[Bartsch-1] P. Bartsch (1917), Descriptions of new west American marine mollusks and notes on previously described forms; Proceedings of the United States National Museum, vol.52; ISSN 0096-3801

[WoRMS-2] Rosenberg, G. (2011). "Turbonilla canadensis Bartsch, 1917". World Register of Marine Species. Retrieved 2012-03-01.

[3] Turgeon, D.; Quinn, J.F.; Bogan, A.E.; Coan, E.V.; Hochberg, F.G.; Lyons, W.G.; Mikkelsen, P.M.; Neves, R.J.; Roper, C.F.E.; Rosenberg, G.; Roth, B.; Scheltema, A.; Thompson, F.G.; Vecchione, M.; Williams, J.D. (1998). Common and scientific names of aquatic invertebrates from the United States and Canada: mollusks. 2nd ed. American Fisheries Society Special Publication, 26. American Fisheries Society: Bethesda, MD (USA). ISBN 1-888569-01-8. IX, 526 + cd-rom pp.