Liocypris grandis was an extinct species of ostracod. It was not been seen since its original description by Georg Ossian Sars in 1924. It is assessed by extinct for the IUCN Red List in 1996.
In the Ostracod class a once presumed extinct species, liocypris grandis, dwindled to such low numbers that it was classified as completely gone; the species only survived because of its ability to reproduce from both sexual and asexual reproduction.