basal ring of apical complex
lower polar ring of apical complex
exact
posterior polar ring of apical complex
exact
preconoidal ring of apical complex
exact
An electron dense ring at the most posterior position of the apical complex, from which the subpellicular microtubules originate; formed during an invasive life cycle stage of an apicomplexan parasite.
GO:0110165
cellular anatomical structure
is_a
GO:0020007
apical complex
part_of