a–c Chordodes combiareolatus: a, b cluster of crowned areoles (crar) and circumcluster areoles (ccar) in different degrees of preservation of the apical filaments c simple areoles (sar) and the combined simple/tubercle areoles (tar) characteristic for this species d–h Chordodes cf. furnessi: d simple areoles (sar) and bulging areoles (bar) between clusters of crowned areoles (ccar = circumcluster areoles) e thorn areole (thar) f tubercle (tu) g, h two different clusters of crowned and circumcluster areoles, where no differences between these two types of areoles are visible.