Ptychocylis ostenfeldi
Ptychocylis wailesi
Ptychocylis urnula
Ptychocylis acuta
Ptychocylis obtusa
Ptychocylis arctica
Ptychocylis basicurvata
Ptychocylis cylindrica
Ptychocylis drygalskii
Ptychocylis glacialis
Ptychocylis minor