ʻOku pehē ʻe he kau saienisi ʻe taha, ko e ngaahi haʻa mui ʻe fā ʻasi ʻi ʻolunga, ko e ngaahi haʻa siʻi ange kinautolu ʻoku kau ki he ʻinisēkite. Ko e pupunga ia ʻo e taʻekapakau (apterygota), ko e ʻinisēkite moʻoni ʻoku nau kau ki he kapakau (pterygota); ko e ongo haʻa siʻi ia.