Triplofusus has been fairly widely accepted among systematists,
especially paleontologists (it was proposed in a paleontological
publication, though based on the modern species); there are also a few
examples (such as Keen, 1971) expressing doubts about Pleuroploca for
the large New World horse conchs, while not specifically noting
Triplofusus.

No molecular studies have been done to address this question, not that
DNA magically answers the question but that it would provide some
additional information.  There are a few sequences for fasciolariids,
including T. giganteus, but not all for the same gene and not enough
to really evaluate their relationships.

papillosa is generally considered a dubious species.

--
Dr. David Campbell
425 Scientific Collections
University of Alabama
"I think of my happy condition, surrounded by acres of clams"

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