Definitions

1. noun

A genus of extinct, cephalopod-like mollusks, characterized by their distinctive shells with a bulbous body and long siphuncle.

“Fossil remains of the amphitheccia have been discovered in various parts of the world, providing valuable insights into ancient marine ecosystems.”

2. adjective

Describing a shell or other structure that is similar in shape or form to an amphitheccia.

“The unique amphitheccian shape of the snail’s shell allowed it to efficiently seal itself from predators.”