Crossword clue: the lowest division of rhizopods, including those which resemble the amoebas, but are destitute of a nucleus.
1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).
Possible answers
monera
6 letters
web-def
prokaryotic bacteria and blue-green algae and various primitive pathogens; because of lack of consensus on how to divide