Using this search facility provides a list of species which are recorded in the Geographical area selected, that is Northern Ireland or the Republic of Ireland. You may narrow the search to a single checklist using the dropdown box if required.
Searching for species using the Location option you must select a Geographical area and then type in the name in full of the Family or Genus you are interested in.
This will return results that contain both of your criteria. For example, selecting "Northern Ireland" in the Geographical area box and inputting "Gyrinidae" in the Family or Genus name box will retrieve only those species within this family that are recorded for Northern Ireland.