Protozoa were traditionally classified as a phylum within the kingdom Protista, but recent research has shown that they are a polyphyletic group, meaning they don't share a single common ancestor. This means they are not a natural grouping and have been reclassified into different phyla based on evolutionary relationships.
Instead of a single phylum, Protozoa are now spread across several different phyla within the kingdom Protista, including:
* Amoebozoa: Amoebas
* Foraminifera: Foraminiferans
* Ciliophora: Ciliates
* Apicomplexa: Apicomplexans
* Radiolaria: Radiolarians
* Diplomonadida: Diplomonads
* Parabasalida: Parabasalids
So, there is no single scientific name for "phylum Protozoa" because it is no longer a valid phylum in modern classification. Instead, the various groups that were previously classified as Protozoa are now spread across multiple different phyla within the kingdom Protista.
