瀑原基

罗氏沼虾胚胎发育研究Ⅱ.原始器官原基形成和消化系统的发生

pyriform apparatus (绦虫), pyriform organ(苔藓动物)

genital organ, reproductive organ

vomeronasal organ

chordotonal organ

organ

visual organ

palpal organ

urinary organ