Nice fossil! It looks like some kind of Stephanoceratid to me, but without size information and some kind of provenance that would just be a WAG. Try to find out where it came from and what geologic formation/age it was found in, a lot of ammonites look the same as others (homeomorphs) so it could be any one of thousands
Thanks Kevin! I had a similar feeling its super family is Stephanoceratoidea. Its size is around 4cm. I don't know its origin as it's bought from a market. I am an amateur ammonite collector. I find it's so hard to tell the difference between some genus sometimes. Any books or resources to recommend ?
I feel the most similar looking I found from google is Otoites in Otoitidae family under Stephanoceratoidea. From the items I found Internet, they have similar sizes.
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