Lirapex costellatus is a species of sea snail, a marine gastropod mollusc in the family Peltospiridae.
Description The length of the shell attains 3.6 mm. Lirapex costellatus form shallow marine sediments. It is a chemosymbiotroph. It has sexual reproduction.
Distribution This marine species occurs on the Mid-Atlantic Ridge at a depth of 685 m.
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