Type species. Alveolocyathus nordenskjoeldi Filkorn, 1994, Maastrichtian of Antarctic Peninsula (López de Bertodano Formation, Seymour Island).
Diagnosis. Solitary, conical, free, circular in outline with pointed base. Costosepta compact, hexamerally arranged, Dentate laterally. Costae serrate. Higher cycle costae (C3–4) originate by trifurcation. Pali in front of S2, and lamellar. Columella papillose to rudimentary.