Holapogon maximus, the titan cardinalfish, is a species of ray-finned fish in the family Apogonidae, the cardinalfishes. This species is the only known member of the genus Holapogon.Mabuchi, K., Fraser, T.H., Song, H., Azuma, Y. & Nishida, M. (2014): Revision of the systematics of the cardinalfishes (Percomorpha: Apogonidae) based on molecular analyses and comparative reevaluation of morphological characters. Zootaxa, 3846 (2): 151–203. It is native to the Arabian coast and the Gulf of Oman, and it has recently been recorded from the coast of India.Said Koya, K.P., Akhilesh, K.V. & Bineesh, K.K. (2001): A new record of Titan cardinalfish, Holapogon maximus (Apogonidae) along the south-west coast of India. Marine Biodiversity Records, 4: e36. It lives at depths of from . This species grows to a total length of .
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