| 词条 | Odostomia dicella |
| 释义 |
| name = Odostomia dicella | image = Odostomia dicella 001.png | image_caption = Apertural view of Odostomia dicella | regnum = Animalia | phylum = Mollusca | classis = Gastropoda | unranked_superfamilia = clade Heterobranchia clade Euthyneura clade Panpulmonata | superfamilia = Pyramidelloidea | familia = Pyramidellidae | subfamilia = | genus = Odostomia | subgenus = | species = O. dicella | binomial = Odostomia dicella | binomial_authority = Bartsch, 1912 | synonyms_ref = | synonyms = Odostomia (Chrysallida) dicella Bartsch, 1912 }}Odostomia dicella is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.[1][2] DescriptionThe small shell measures 3 mm. It is elongate-ovate, somewhat translucent, bluish-white. The nuclear whorls are small, very obliquely immersed in the first of the succeeding turns. The five post-nuclear whorls are well rounded. They are marked by four spiral cords between the sutures, the three posterior of which are nodulose on the early whorls. The fourth, or suprasutural one being smooth. On the last whorl the nodules are obsolete. Of these cords, the one at the summit is the weakest and the second below it the strongest. The spaces between the spiral keels are about half as wide as the keels and rather shallow. In addition to the spiral sculpture the whorls are marked by slender, almost axial riblets, which render the three posterior keels on the early whorls nodulose at their intersections. Of these riblets, about 18 occur upon the second and 22 upon the third whorl. On the fourth, which is the penultimate, the grooves between the keels are crossed by slender axial threads. The sutures are strongly constricted. The periphery of the body whorl is marked by a narrow, deep sulcus. The base of the shell is moderately long, well rounded. It is marked by five spiral cords which grow successively weaker between the periphery and the umbilical area. The grooves between the sutural cords are equal, crossed by numerous, slender, axial threads, which cause the spaces between the threads and cords to appear as minute pits. The aperture is moderately large, somewhat effuse anteriorly;.The posterior angle is acute. The outer lip is thin, showing the external sculpture within. The inner lip is moderately long, strong, somewhat curved, and reflected over and adnate to the base. It is provided with a slender fold at its insertion. The parietal wall is covered with a thin callus.[3] DistributionThis species occurs in the Pacific Ocean off San Diego, California. References1. ^Rosenberg, G. (2011). Odostomia dicella Bartsch, 1912. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=581127 on 2011-10-26 2. ^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. 3. ^Proceedings of the United States National Museum 42:286 Odostomia (Chrysallida) dicella External links
2 : Pyramidellidae|Gastropods described in 1912 |
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