Cassidulus infidus is a species of sea urchin of the family Cassidulidae. Their armour is covered with spines. Cassidulus infidus was first scientifically described in 1948 by Ole Theodor Jensen Mortensen.Kroh, A. (2010). Cassidulus infidus (Mortensen, 1948). In: Kroh, A. & Mooi, R. (2010) World Echinoidea Database. at the World Register of Marine Species.
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