襟鞭毛虫綱 えりべんもうちゅうこう Choanoflagellatea; class of flagellate eukaryotes closely related to animals n Advanced ➥
硬骨魚綱 こうこつぎょこう Osteichthyes; class comprising the bony fishes (and sometimes their descendants, i.e. tetrapods) n Advanced ➥