ʻOku ʻi ai ha ongo haʻa (classis) ʻi he vahe siʻi ʻo e ngaahi monumanu kaungao pe ika kaungao, (gnathostomata):
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ika huihui (osteichthyes), ko honau ʻū hui, ko e hui moʻoni; ʻoku vaheʻi ʻi ua:
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ika niuniu (chondrichthyes), ko honau ʻū hui, ʻoku ʻikai faʻu he hui, kā ko e niuniu pe.
Ko e ngaahi ika kau ki ai:
Ko e kupu ʻeni ko e potuʻi ia (stub). ʻIo, ko koe, kātaki tokoni mai ʻi hono .
