''Cassidulus infidus'' is a species of

sea urchin Sea urchins () are spiny, globular echinoderms in the class Echinoidea. About 950 species of sea urchin live on the seabed of every ocean and inhabit every depth zone from the intertidal seashore down to . The spherical, hard shells (tests) ...

of the

family Family (from la, familia) is a group of people related either by consanguinity (by recognized birth) or affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its members and of society. Idea ...

Cassidulidae Cassidulidae is a family of echinoderms belonging to the order Cassiduloida. Genera: * '' Anisopetalus'' * ''Cassidulus ''Cassidulus'' is a genus of echinoderms belonging to the family Cassidulidae. The species of this genus are found in Europ ...

. Their armour is covered with spines. ''Cassidulus infidus'' was first scientifically described in 1948 by

Ole Theodor Jensen Mortensen Ole Theodor Jensen Mortensen, also known as Theodor Mortensen (22 February 1868 – 3 April 1952) was a Danish scientist and professor at the Zoological Museum, Copenhagen. He specialized in sea urchins (Echinoidea) and provided an enormous marine ...

.Kroh, A. (2010). ''Cassidulus infidus'' (Mortensen, 1948). In: Kroh, A. & Mooi, R. (2010
World Echinoidea Database
at the

World Register of Marine Species The World Register of Marine Species (WoRMS) is a taxonomic database that aims to provide an authoritative and comprehensive list of names of marine organisms. Content The content of the registry is edited and maintained by scientific speciali ...

References

Animals described in 1948 Taxa named by Ole Theodor Jensen Mortensen Cassidulidae {{Echinoidea-stub