Radial cleavage is observed in the eggs of which of the following?

Echinoderm eggs undergo radial cleavage.

• Radial cleavage is characteristic of deuterostome embryos like echinoderms and chordates, where cleavage planes are parallel or perpendicular to the animal-vegetal axis, leading to a radial arrangement of blastomeres. 
• Spiral cleavage is found in some protostomes like molluscs and annelids, featuring diagonal cleavage planes at oblique angles to each other, resulting in a spiral pattern of blastomeres.