Euglena and Protozoa

Euglena noun - Minute single-celled green freshwater organism having a single flagella; often classed as algae.

Protozoa and euglena are semantically related In some cases you can replace term "Protozoa" with "Euglena", this nouns are similar.

Protozoa noun - In some classifications considered a superphylum or a subkingdom; comprises flagellates; ciliates; sporozoans; amoebas; foraminifers.

Euglena and protozoa are semantically related in minute organism topic. You can use "Euglena" instead a noun "Protozoa".