Turbonilla obsoleta is a species of sea snail, a marine gastropod mollusk in the family Pyramidellidae, the pyrams and their allies.[2][3]
| Turbonilla obsoleta | |
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| Drawing of a (partial) shell of Turbonilla obsoleta | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Heterobranchia |
| Family: | Pyramidellidae |
| Genus: | Turbonilla |
| Species: | T. obsoleta
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| Binomial name | |
| Turbonilla obsoleta | |
| Synonyms | |
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Description edit
The broadly elongate shell has a grayish white color. The type specimen has lost its early whorls, the length of the 4½ remaining whorls of the teleoconch measures 1.5 mm. The whorls of the teleoconch are feebly rounded. They are marked by obsolete axial ribs which are best shown immediately below the appressed summit. The entire surface is marked by extremely fine spiral lines. The aperture is rhomboidal. The posterior angle is acute. The outer lip is thin. The columella is slightly twisted and somewhat revolute.[4]
Distribution edit
The type specimen of this marine species was found off Mazatlán, Baja California peninsula.
References edit
- ^ Carpenter, Cat. Mazatlan Shells, 1856, p. 436.
- ^ WoRMS (2011). Turbonilla obsoleta (Carpenter, 1857). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=576081 on 2012-04-21
- ^ Keen M. (1971). Sea shells of Tropical West America. Marine mollusks from Baja California to Perú. (2nd edit.). Stanford University Press pp. 1064
- ^ Dall & Bartsch (1909), A monograph of West American pyramidellid mollusks, United States National Museum, bulletin 68, p.59 (described as Turbonilla (Ptycheulimella) obsoleta)