EDIT

in #6959 the display of Registration metadata in a Drupla block has been implemented.

Since a Taxon page can contain multiple Registrations the approach to display this data in a block is not reallay appropriate.
Therefore we decided to show the Registration metadata together with the reference footnote.

Planothidium victori is a good example since it has two nomenclatoral acts a registration for each.

The Registration metadata will be appended to the reference:

{footnoteky} {reference} Registration: {Registration.identifier} {Registration.registrationDate as ISO-Date}