Naticarius stercusmuscarum or Notocochlis tigrina?

[BOWIE]

Hello forum,while i was metal detecting a field, i have found a "natica" peep out  from a clump of dirt. It seems has many light-brown spot all over the shell and a large navel canal. Considering the plus common specimen of Naticidae that are my area, what's the correct genus:Naticarius or Notocochlis, the fly-specked moon snail or the tiger moon snail? To you the hard judge. Thanks!

 

PS: "natica" in in italiano it means "buttock"

 

Davide

[abyssunder]

Compared with a Notocochlis tigrina fossil from Pliocene of Italy, on display at the Museo Paleontologico Giulio Maini, Ovada - looks like that.

 

I changed the color of the specimen in question for a better view of the color pattern on the shell. The arrangement of the "dots" on the shell looks similar to the one from the right. Also, Notocochlis tigrina has less "dots" than Naticarius stercusmuscarum.
For comparative reason, here are other two examples :

Notocochlis tigrina

https://commons.wikimedia.org/wiki/File:Notocochlis_tigrina_01.JPG

Naticarius stercusmuscarum

https://commons.wikimedia.org/wiki/Category:Naticarius_stercusmuscarum#/media/File:Naturalis_Biodiversity_Center_-_ZMA.MOLL.341398_-_Naticarius_stercusmuscarum_(Gmelin,_1791)_-_Naticidae_-_Mollusc_shell.jpeg

Edited October 16, 2016 by abyssunder
Addendum

[tmaier]

Sometimes you can soak a shell in bleach, then rinse it, then wait about an hour, and the color patterns will show up more vididly on some fossil shells. You see the patterns of the coloration, but not actually the original colors. The effects of this bleaching are most effective shortly after bleaching, and fades in the days and months later. The type of fossils this seems to work best on are the powdery white looking ones like in the original specimen in this thread. You will sometimes find that a shell that seems to have not patterns at all will suddenly have obvious stripes or dots after bleaching.

[BOWIE]

Thanks tmaier for the advice. It works, here's the result: the brown dots are visible more neat. So, it's a tigrina, right? 

[abyssunder]

Yes. It is a nice Notocochlis tigrina.

[fifbrindacier]

On ‎16‎/‎10‎/‎2016 at 4:40 PM, BOWIE said:

PS: "natica" in in italiano it means "buttock"

 

David

 

 

[BOWIE]

"Natica" is the italian word for "" ( from the latin: natis) maybe called with this name for the rounded form of the snail's shell  

[fifbrindacier]

3 hours ago, BOWIE said:

"Natica" is the italian word for "" ( from the latin: natis) maybe called with this name for the rounded form of the snail's shell  

. That's an excellent way to remember the form of something : comparisons that immediately "speak" to the mind and memory.

[BOWIE]

In this connection, i should point out to you an amazing work from Pedriali e Robba about the Naticids of the italian pliocene:

http://riviste.unimi.it/index.php/RIPS/article/download/6279/6236

 

why the notocochlis tigrina here is cited as cochlis raropunctata? is it a different specimen?