Cardiapoda placenta, common name the flat cardiapod, is a species of sea snail, a rare pelagic gastropod mollusc in the family Carinariidae.
This species is found worldwide in warm seas between latitudes 40ð North and 40ð South at depths of up to 650 m.
The maximum recorded shell length is 35 mm.
Minimum recorded depth is 0 m. Maximum recorded depth is 203 m.