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Direct from the horses mouth:
The brown and other smoothhounds can be distinguished from the soupfin shark since their second dorsal fins originate well in advance of the beginning of the anal fin; while in the soupfin, the second dorsal begins behind the origin of the anal fin.
Funny that this is the only mention of the Soupfin in the fish identification section, and no pics. But after viewing again I can clearly see that the fins start about the same location so Soupfin it is.
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