''Apatopygus occidentalis'' 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

Apatopygidae Apatopygidae is a family of echinoderms belonging to the order Cassiduloida Cassiduloida is an order (biology), order of sea urchins. The group was extremely diverse with many families and species during the Mesozoic, but today, only seven exta ...

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

Apatopygus ''Apatopygus'' is a genus of echinoderms belonging to the family Apatopygidae. The species of this genus are found in Australia and New Zealand. Species: *'' Apatopygus garciasanzi'' *'' Apatopygus gaudensis'' *'' Apatopygus mannumensis'' * ...

'' and lives in the sea. ''Apatopygus occidentalis'' was first scientifically described in 1928 by

Hubert Lyman Clark Hubert Lyman Clark (January 9, 1870 – July 31, 1947) was an American zoologist. The son of Professor William Smith Clark, he was born at Amherst, Massachusetts, and educated at Amherst College and Johns Hopkins University. From 1899 to 1905 he ...

, American zoologist.Kroh, A. (2010). ''Apatopygus occidentalis'' (Hubert Lyman Clark, 1928). 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

Apatopygidae Animals described in 1928 Taxa named by Hubert Lyman Clark {{Echinoidea-stub