I'm in doubt about this shell id. I am not sure it is vanikorensis species.
<a href="http://img251.imageshack.us/i/imbricariavanikorensis.jpg/" target="_blank"><img src="http://img251.imageshack.us/img251/7258/imbricariavanikorensis.jpg" alt="http://img251.imageshack.us/img251/7258/imbricariavanikorensis.jpg" style="border:0" /></a>
Sorry, I forgot others indications:
Locality New Guinea
Dimensions 13.5 - 15 mm
It is not Imbricaria vanikorensis, it looks more like one of the Scabricola species, maybe ocellata?
I would say Scabricola limata
Here is a new more detailed photo.
Can you confirm Scabricola limata ?
<a href="http://img641.imageshack.us/i/imbricarialimata.jpg/" target="_blank"><img src="http://img641.imageshack.us/img641/5822/imbricarialimata.jpg" alt="http://img641.imageshack.us/img641/5822/imbricarialimata.jpg" style="border:0" /></a>
Scabricola (Swainsonia) limata and S. ocellata are similar in color and pattern, but S. ocellata is generally more elongate, with a taller spire, and a length-width ratio about 3. Â S. limata typically looks "short and plump" with distinctly rounded whorls, and a length-width ratio slightly more than 2. Â Also, the spiral grooves in S. limata are distinctly punctate, while in S. ocellata they are smooth or nearly so. Â For these reasons I think this specimen is S. limata.
<a href="http://www.conchology.be/?t=66&family=MITRIDAE&species=Swainsonia%20limata" target="_blank"><!-- m --><a class="postlink" href="http://www.conchology.be/?t=66&family=MITRIDAE&species=Swainsonia%20limata">http://www.conchology.be/?t=66&family=M ... a%20limata</a><!-- m --></a>
.
Paul, what to say ? Thanks for you so clear explanation