Retidrillia megalacme is a species of sea snail, a marine gastropod mollusk in the family Borsoniidae.[1]
| Retidrillia megalacme | |
|---|---|
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| Original drawing with an apertural view and the protoconch of a shell of Retidrillia megalacme | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Caenogastropoda |
| Order: | Neogastropoda |
| Superfamily: | Conoidea |
| Family: | Borsoniidae |
| Genus: | Retidrillia |
| Species: | R. megalacme
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| Binomial name | |
| Retidrillia megalacme (Sykes, 1906)
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| Synonyms[1] | |
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Description
editThe length of the shell attains 5 mm, its width 2.5 mm.
(Original description) The small shell has a conical-fusiform shape. The spire is well raised and fairly solid. Its colour (dead) is whitish-brown, with a white protoconch. It contains 6. turreted whorls, regularly increasing. The white protoconch is large. The first whorl and a half are smooth, then closely set longitudinal riblets are seen, and the whorl becomes carinate. The remaining whorls are acutely carinate, with an area below the suture, either smooth or with arcuate striae. Below the carina appear numerous longitudinal riblets, decussated by spiral carinations, giving the shell a somewhat prickly or nodulous appearance. The aperture is small, with a well-marked sinuation above. The columella is vertical, a little twisted at the base.[2]
Distribution
editThis species occurs in the Atlantic Ocean off Portugal.
References
edit- ^ a b Bouchet, P. (2015). Retidrillia megalacme. In: MolluscaBase (2015). Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=832444 on 2016-03-23
- ^ Sykes E. R. 1906 On the Mollusca procured during the “Porcupine” Expeditions 1869–1870. Supplemental notes, part 3. Proceedings of the Malacological Society of London 7: 173–190
- Sykes E. R. 1906 On the Mollusca procured during the "Porcupine" Expeditions 1869–1870. Supplemental notes, part 3. Proceedings of the Malacological Society of London 7: 173–190.
- McLean J. H. (2000). Four new genera for northeastern Pacific gastropods. The Nautilus. 114: 99–102.