[2] R. intermedia is found in the bottom sludge of freshwater bodies in Canada, Chile, Argentina, Australia, New Zealand, Malaysia, Russia, and central Europe.

[4] Species can be found solitarily and/or colonially;[5] in that stage interconnected with cytoplasmic bridges.

[6] In Raphidiophrys contractilis it has been observed that upon capturing prey, its axopodia will contract toward the cell body,[6] however, the presence of Ca2+ is required.

[6] Microtubules extend from the centroplast to form axonemes of the axopodia and are linked together by cross bridges.

[2] Raphidiophrys heterophryoidea is the first organism to show a combination of scales and spicules in one species amongst heliozoans demonstrating a transitional state observed at least twice in centrohelid evolution.