Yes, check out Dec 2013: pp. 10-16 , an article by Andre Meredith with 
excellent images and plenty of morphological differences explained.

Tom Eichhorst

On 3/6/2019 11:47 AM, steve rosenthal wrote:
> wasn't there an article with lots of photos  about these species in
> American Conchologist about 3-4 yrs ago? If i recall correctly the
> locality figured mightily into it too.
>
>
>
> On 3/6/19, William Bennight <[log in to unmask]> wrote:
>> John,  Having both species in my collection I can with reasonable confidence
>> say that the major difference is the size. H. arthritica is a much smaller
>> species. The first time I saw one I thought it was a dwarf or a sex
>> difference of chiragra. I recommend that you get one in each hand and look
>> them both over real good. I would suggest that you attend a COA conference
>> and enjoy the bourse the last two days. The shell dealers there can answer
>> any questions you have.
>> Bill Bennight, past president of the North Carolina Shell Club.
>>
>> Sent from my iPhone
>>
>>> On Mar 5, 2019, at 10:49 PM, John Jacobs <[log in to unmask]>
>>> wrote:
>>>
>>> I'm trying to resolve a mystery regarding two Harpago species, both listed
>>> in WoRMS.  H. arthriticus & H. chiragra rugosus.  After looking at many
>>> pics under both names, I can't tell them apart.  Comments?
>>>   Thanks.
>>>
>>> John
>>>
>>> John and Cheryl Jacobs
>>> Seffner, FL
>>> [log in to unmask]
>>>
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