[Answer] In cephalopods, what is a pen?

Step 1 : Introduction to the question " In cephalopods, what is a pen? "

...

The gladius (plural: gladii), or pen, is a hard internal body part found in many cephalopods of the superorder 'Decapodiformes' (particularly squids) and in a single extant member of the 'Octopodiformes', the vampire squid ('Vampyroteuthis infernalis').

It is so named for its superficial resemblance to the Roman short sword of the same name and is a vestige of the ancestral mollusc shell, which was external. The gladius is located dorsally within the mantle and usually extends for its entire length. Composed primarily of chitin, it lies within the shell sac, which is responsible for its secretion.

More Info: en.wikipedia.org

Step 2 : Answer to the question " In cephalopods, what is a pen? "

Heart:

Please let us know as comment, if the answer is not correct!

Step 3 : Disclaimer & Terms of Use regarding the question " In cephalopods, what is a pen? "

Our machine learning tool trying its best to find the relevant answer to your question. Now its your turn, "The more we share The more we have". Share our work with whom you care, along with your comment ...Kindly check our comments section, Sometimes our tool may wrong but not our users.

Are We Wrong To Think We're Right? Then Give Right Answer Below As Comment