Pyramidella mexicana
| Pyramidella mexicana | |
|---|---|
| |
| Drawing of a shell of Pyramidella mexicana | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Heterobranchia |
| Family: | Pyramidellidae |
| Genus: | Pyramidella |
| Species: | P. mexicana
|
| Binomial name | |
| Pyramidella mexicana Dall & Bartsch, 1909
| |
| Synonyms | |
|
Pyramidella (Longchaeus) mexicana Dall & Bartsch, 1909 | |
Pyramidella mexicana is a
Description
The large, robust shell has a broadly conic shape. Its color is dull brown. (The
teleoconch are flattened, flatly shouldered and crenulated at the summit. The body whorl is inflated and well rounded. The periphery of the body whorl is marked by a strong sulcus. The sutures are channeled. The entire surface of the spire and the base is marked by lines of growth, which are quite prominent on the last turn. The base of the shell is inflated, strongly rounded, and with a slender fasciole at the insertion of the columella. The aperture is oval. The posterior angle is acute; slightly channeled anteriorly. The outer lip
is thin, with a white band at the periphery, the remainder brown with darker colored
lines,. It is reinforced deeply within by five spiral cords, two of which are posterior and three anterior to the periphery. The columella is stout, conic, with a strong lamellar fold at its insertion and two much more oblique ones anterior to it.[3]
Distribution
This species occurs in the Pacific Ocean off Baja California peninsula.
References
- ^ Rosenberg, G. (2011). Pyramidella mexicana Dall & Bartsch, 1909. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=581279 on 2012-01-12
- ISBN 1-888569-01-8. IX, 526 + cd-rom pp.
- ^ Dall & Bartsch, A Monograph of West American Pyramidellid Mollusks, United States National Museum Bulletin 68, p. 21-22: 1909