''Ammotrophus cyclius'' is a species of sand dollar of the family Clypeasteridae. Their external skeleton, known as a test, is covered with spines. It belongs to the genus ''

Ammotrophus ''Ammotrophus'' is a genus of echinoderms belonging to the family Clypeasteridae Clypeasteridae is a family of sea urchins in the order Clypeasteroida. This family was first scientifically described in 1835 by the Swiss-American biologist Louis ...

'' and lives in the seas off southern Australia. ''Ammotrophus cyclius'' was first scientifically described in 1928 by

Hubert 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 w ...

.Kroh, A. (2010). ''Ammotrophus cyclius'' (Hubert Lyman Clark, 1928). In: Kroh, A. & Mooi, R. (2010
World Echinoidea Database
at the World Register of Marine Species.

References

Clypeasteridae Animals described in 1928 Taxa named by Hubert Lyman Clark {{echinoidea-stub