Although recent classifications have considerably modified the understood
relationships among protists, there is not, as far as I know, any recent
official decision as to where to draw the lines between the jurisdictions
of the botanical and zoological codes.  The picture gets very messy,
because several groups include both photosynthesizing and
non-photosynthesizing forms, and many separate groups of protists have
gained photosynthesis by picking it up from another protist.  In practice,
it's more or less whether some organism is generally regarded as algae or
not.  In the case of Giardia, it seems fairly unalgal and thus a homonym
that must be fixed.

The homonym seems obvious, but only for someone familiar with both
parasitic protists and land snails.

--
Dr. David Campbell
Collections Assistant
The Paleontological Research Institution
1259 Trumansburg Road
Ithaca NY 14850

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