Usage
Input: |1=Taxon name
Output:
- If Taxon is a regnum (or equivalent higher category),
[[{{{1}}}]] - Else: Null.
Intended use: Call repeatedly for each taxon in a taxobox (using {{Get regnum()}}). Because a null string is returned for all non-regna, all that remains will be the regnum. Pass this output to {{Taxobox colour}} to generate colours for a taxobox.
Examples
{{is reg|Animalia}}→ animalia{{is reg|Columbidae}}→
