Definitions

1. noun

A clade of single-celled, eukaryotic organisms thought to be the ancestors of all animals.

“These cytozzoa were likely simple multicellular organisms, which gradually gave rise to complex animal life.”

2. noun

A group of eukaryotic cells, often single-celled, thought to be the earliest ancestors of animals.

“Recent discoveries have led to a better understanding of the cytozzoa and their place in animal evolution.”