Related how?

Biota (Life)
Eukaryote (Eukarya)
Diaphoretickes (Plants+hc+sar megagroup)
Archaeplastida
Plant (Green plants)
Viridiplantae (Chlorobiota)
Charophyta (Charophytes)
Zygnematophyceae (Zygnemophyceae)
Desmidiales
Desmidiaceae
Cosmarium

Cosmarium costatum (10750215)

Children (3 direct children, 3 direct and indirect children):

Cosmarium costatum var. subhexalobum

Cosmarium costatum var. tatrense

Cosmarium costatum f. minus