Costapex martinorum is a species of sea snail, a marine gastropod mollusk, in the family Costellariidae, the ribbed miters.

[1][2] The species was identified by Walter Olivier Cernohorsky in 1986, based on a specimen in the Auckland War Memorial Museum collected from off the coast of Cuaming Island in the Philippines.

[3] This Costellariidae-related article is a stub.

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