Definition: Acephalina is a genus of cephalopods in the order Mollusca, found in many marine environments around the world. They are often referred to as "sea cucumbers" because they have tentacles on their backs that help them move through water. The word 'cephalina' comes from the Greek word for 'head' or 'head of', which is the root of the term cephalopod, meaning a sea shell. It also implies that these animals have a head with tentacles like those of sea cucumbers, which are commonly found in coastal waters. The definition of 'cephalina' as a genus of marine cephalopods may vary depending on the specific study or reference you are using. However, generally, 'cephalinae' refers to a group of marine cephalopods that includes species such as the sea anemones and sea cucumbers. It's important to note that it is not uncommon for different scientific organizations to use slightly different terms in their definitions of marine cephalopods.

Acephalina