noun
Choanoflagellatea
A class of flagellate eukaryotes closely related to animals; used in biological taxonomy.
襟鞭毛虫綱は動物に最も近い単細胞生物の一群である。
Choanoflagellatea is a group of unicellular organisms most closely related to animals.
The term is a modern scientific compound: 襟 (collar) + 鞭毛虫 (flagellate) + 綱 (class), referring to the collar-like structure of choanoflagellates.