Spondylus is a genus of bivalve molluscs, the only genus in the family Spondylidae. They are known in English as spiny oysters or thorny oysters (though they are not, in fact, true oysters).

Spondylidae. Retrieved May, 22 2023, from en.wikipedia.org/wiki/Spondylus.

Spondylus varius, is a species of large marine bivalve mollusc in the family Spondylidae, the spiny oysters.

Spondylus varians. Retrieved May, 22 2023, from en.wikipedia.org/wiki/Spondylus_varius.