''Aspidodiadema arcitum'' 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 ...

of the family

Aspidodiadematidae The Aspidodiadematidae are a family of sea urchins. Characteristics All the members of the two extant genera, ''Aspidodiadema'' and ''Plesiodiadema'', are found in tropical seas at bathyal and abyssal depths, often on the submarine slopes of i ...

. Their armour is covered with spines. It is placed in the genus

Aspidodiadema ''Aspidodiadema'' is a genus of echinoderms belonging to the family Aspidodiadematidae. The species of this genus are found in the Indo-Pacific and Caribbean. Description The test is small and subglobular with fragile plating which is firmly te ...

and lives in the sea. ''Aspidodiadema arcitum'' was first scientifically described in 1939 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 urchin Sea urchins () are spiny, globular echino ...

, a Danish scientist.

References

arcitum Animals described in 1939 Taxa named by Ole Theodor Jensen Mortensen {{echinoidea-stub