Alcithoe calva is a large deepwater sea snail, a marine prosobranch gastropod mollusc in the family Volutidae, the volutes.
This species is endemic
to the South Island
of New Zealand
at depths of between 70 and 110 m
The shell of this species is similar to that of Alcithoe swainsoni
but with a tall narrow spire
, a long narrow aperture
, and no columellar callus plate.
The shell coloration is yellowish-brown with very faint brownish zigzag markings.
The shell height is up to 177 mm, and the width is up to 64 mm.