Matanui is a genus of triplefin blennies (family Tripterygiidae), they are endemic to New Zealand.
Species Chatham deep-water triplefin, Matanui bathytaton (Hardy, 1989) Deepwater triplefin, Matanui profundum (Fricke & Roberts, 1994)
Etymology The name Matanui is derived from the Māori words mata meaning "eye" and nui meaning "large", a reference to its large eyes.
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