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I'd wanted to give a concrete example of what the removal of the type checklist from the GBIF backbone has done.

The taxon in question is Hoplopsyllus tenuidigitus Stewart, 1940

When this taxon was part of the backbone, everything worked as expected. Occurrences with an identification of Hoplopsyllus tenuidigitus could be found with that name and as it was recorded as a synonym of Euchoplopsyllus glacialis (Taschenberg, 1880) it would have been interpreted as that and so could be found using the currently accepted name as well. Everyone would be happy.

Now that Hoplopsyllus tenuidigitus Stewart, 1940 has been deleted, the occurrences with this identification are interpreted as Hoplopsyllus Baker, 1905 which has no association with the currently accepted name Euchoplopsyllus glacialis (Taschenberg, 1880) and so will not be discovered by anyone searching that name.

A search in occurrences for Hoplopsyllus tenuidigitus Stewart, 1940 using "Search all fields" does bring up the record, but it is buried in with a bunch of other things also interpreted as Hoplopsyllus Baker, 1905.

I thought that "limiting my search to this taxon only" might help, but it just removes the Hoplopsyllus tenuidigitus Stewart, 1940 records and a search in scientific name for Hoplopsyllus tenuidigitus Stewart, 1940 finds nothing. It seems the only way to get to things with a verbatim identification of Hoplopsyllus tenuidigitus Stewart, 1940 is to know beforehand the GBIF taxon id and place it in the url.

The end result is that things that previously would have been discovered now are not.

EXCEPT

History of the name Hoplopsyllus tenuidigitus Stewart, 1940 using Google reveals a tangled web:

1940 - Described by Stewart - unknown where

1940-41 Evidence found in Ten papers on WESTERN FLEAS in which are erected two new genera and fourteen new species

1953 - listed as synonom of Hoplopsyllus foxi Ewing 1924 in

A Synopsis of North American Fleas, North of Mexico, and Notice of a Supplementary Index

1967 - listed as synonom of Hoplopsyllus (Euhoplopsyllus) glacialis foxi Ewing 1924 in

NIH Bulletin

1996-97 listed as synonom of Euhoplopsyllus foxi Ewing 1924 in

Nomina Insecta Nearctica

2021 listed as synonym of Euchoplopsyllus glacialis (Taschenberg, 1880) in GBIF

So, I cannot really trace what happened to this name or why without a lot more time and access to publications and I also cannot say for certain that the name Hoplopsyllus tenuidigitus Stewart, 1940 is indeed currently represented by Euchoplopsyllus glacialis (Taschenberg, 1880). BUT I do believe that these published associations should be made if anyone is going to discover specimens of interest using any of the names that might be associated with a name used as an identification.