Images of 2 gastropod shells is attached (dorsal and ventral). While one shell had thin, black markings running vertically from the apex to the last whorl the other had thick markings. Shell length is 15 & 18 mm while the width was same (12 mm). Do the shells belong to Trochidae or Calliostomatidae? The characteristic stepped spire is seen and the pointed apex is similar to both these families. I would appreciate if anyone could identify them.
From the basal view it seem to be phanerophalous, and as far as I know Trochidae is anomphalous.
Hello Samuel - For me it's one Trochinae and, probable, Genus Trochus s.l. Remember me a southafricanian species: is it possible?
I am still a bit confused Bini, but thanks for the input.. I am now trying to go into minor details of the shell! Dr Davey and Dr Roy, thanks for your inputs too...
HI Maria. these shells were collected from the west coast of India, Arabian Sea. Still, beside the umbilicus character, the body structure is not that of Tegula but a typical Trochus! keeping fingers crossed!!
the right one maybe Calliostoma ocellatum (Reeve, 18630)also reported from Pakistan
It is confirmed under Genus Clanculus. The specimens are juveniles..
If the sample comes from the Arabian Sea (West India), in my opinion can only be a juvenile of Trochus kochii Philippi, 1844. I've got the coast of Oman (Muscat area) and are similar to the photo I am attaching, photo taken from the website of the Natural History Museum of Rotterdam.
Dear Bini,
thanks for the share Dr Bini. Let me check with the morphological characters for T.kochi.
Regards
Deepak
Consulting the Pilsbry's monograph (Manual of Conchology Vol. XI, 1889) and also by comparing the figures of "Trochus" kochii and "Clanculus" scabrosus, personally I still opt for Trochus kochii.
Dear Dr Dekker and Dr Bini,
Thanks a lot for the insights! Is it possible to get any information on Belangeria scabrosa?? Dr Bini, thanks for the attachment!!
Best regards
Deepak
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