where PXXX is the property number and QXXX is the Q-ID for the subject; those two are then used to create the sparql query to fetch all cases where the specified property is equal to the QID.
Note that filter not exists {?item wdt:P31 wd:Q1040689.} is used to filter the results. For this case this exclude the taxon that are synonyms (instance of (P31)→synonym (Q1040689)), which are supposed to be no longer used as taxon names. You can add other filters.
It must be substituted - it will not work if this template is just included in the page. After saving the page, click on the 'Manually update list' link at the top-right and User:ListeriaBot will then run the query and populate the gallery. It will then automatically update the gallery every so often, when there are changes to the content.
