The U.S. Fish and Wildlife Service finalized a rule that removes the requirement that shellfish have an external shell. Photo ...

Squid, cuttlefish, octopus and other cephalopods will now be included within the regulatory definition of shellfish.

Cephalopods comprise one of the most morphologically and ecologically diverse classes of mollusks, tracing their origins to the Late Cambrian. Extant lineages fall into two principal groups: ...

The intricate ram’s horn squid shell is only about the size of a fingernail. Compared to other cephalopod species, the shell structure has not degraded over time. As part of this study, researchers ...

During my beachcombing survey this week along the Texas coast, I was excited to find three Ram’s Horn shells washed ashore among the sargassum seaweed. Although these tiny white shells are often ...