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here are two sources that I would try first:

1.  A Conchological Iconography: Family Turbinidae (A Conchological
Iconography) Loose Leaf – January 1, 2003
by Axel Alf & Kurt Kreipl (text) (Author), Kurt Kreipl & Guido Poppe
Axel Alf (Photographer), ConchBooks (Editor)

this may be findable on Amazon, or from shell dealers who sell books,
or directly from the publisher.   I have a copy, and still have many
specimens I can not be 100% sure of. It also doesnt include species
named since 2003.  I am pretty sure it has all the species mentioned
in the posted query.

2.  Sally Kaicher cards for Turbinidae....you can find these online on
the shell dealer FEMORALE  website,  where all the Kaicher cards are
viewable for no costs....filed under "Kaicher Cards" and then by
family, Turbinidae.  An excellent feature of their  website!

On 5/6/20, Ron G. Noseworthy
<[log in to unmask]> wrote:

 Hi, Louis!

Living in Korea for the past 20 years, I have handled hundreds of "sora",
Turbo cornutus. It is a common food species here, and often found in shell
dumps outside of restaurants and "haenyo stations", which the diving women
of Jeju Ialand use to clean and process their catch.

Most of the T. cornutus found here are spiny but some may be found without
spines. Completely spineless ones are quite scarce; I keep them when I find
them. However, many may be found with the upper portion of the body whorl
spineless and a row of spines developing near the base. They appear to
intergrade with the completely spiny ones. Not only subadults, but also
adult specimens may be like this. I have some from Japan that are completely
spineless.

Can someone tell me the difference between T. stenogyrus and T. cornutus
(smooth form)? T. stenogyrus has been reported from Korea, but I have never
found one.

All the best!
Ron Noseworthy

     On Wednesday, May 6, 2020, 09:26:27 p.m. GMT+9, Louis Wang
<[log in to unmask]> wrote:


Dear all,
Since childhood, I continuously received small Turbo specieslike Turbo
intercostalis , and after ages, when I increase my knowledge, Ithink
undoubtedly there's a handful of small Turbo species which are very close,I
listed all the confusing species as follow:1.Turbo intercostalis2.Turbo
cornutus (hornless form)3.Turbo brunneus4.Turbo cernicus5.Turbo
smithi6.Turbo haynesi7.Turbo sandwicensis8.Turbo stenogyrus
Since they vary a lot in pattern and color which makes this kindof
identification not reliable, I would say potiential identifications canstart
from following aspects:
A. How strong the "cords"texture is there on the body. Some do have less
developped "cords"than others.

B. Whether  there're multiple produced "scales"on the "cords" or not. The
"scales" on "cords"for certain species are less obvious.

C.Whether there's a navel on the bottomor not. I think it will be a fixed
feature for a certain species.

D. Shape of the aperture.

Any good ideas for this kind of complexis welcome!
Kind regards,
Louis