> We also have its relative, Lambis chiragra

Actually belongs in the genus Harpago, which is quite distinct from
Lambis. Harpago has no known fossil record older than Pleistocene, but is
obviously derived from Lambis.

> Fasciolaria trapezium

Belongs in Pleuroploca, a genus closely-related to but distinct from
Fasciolaria. Both have 2 columellar plaits, but Fasciolaria lacks nodes or
cords. One genus will be derived from the other, but which way it went I
don't know; Fasciolaria is probably the derived form, having lost all
cords but the subsutural ones and hints on the canal.

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