Carenzia fastigiata is a species of extremely small deep water sea snail, a marine gastropod mollusk in the family Seguenziidae.

[2] The height of the shell attains 3.3 mm.

it is broader than high with a width of 4.1 mm.

This marine species occurs off New Zealand and in the Tasman Basin at a depth of about 1,700 m.

This Seguenziidae-related article is a stub.