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By Danna Staaf | November 20th 2009 11:05 PM | 4 comments | Print | E-mail | Track Comments
About Danna

Cephalopods have been rocking my world since I was in grade school. Now I'm a graduate student at Stanford University's Hopkins Marine Station, where...

View Danna's Profile
A nifty news story about students in a Florida classroom watching a giant squid dissected in Melbourne, Australia, led me to hunt down an article about the dissection itself. Was it really a giant squid, I wondered wearily, or merely a very large squid?

It was indeed a true giant squid! And the article is quite good, gushing alliteratively about "the museum's mollusc master" using "surgical sweeps of the scalpel" to investigate. Just a few points to clarify:
As giant squids are cannibals and the females larger than the males, breeding involves the male squid firing sperm at the female, where it lodges under her skin.

This makes it sound like the male' penis is some sort of ranged weapon, aiming and firing from a distance. Not so. It is probably more like an air hammer, using pressure to inject sperm under the skin of the female's arms. (This is, of course, speculation based on circumstantial evidence, as no one has yet seen these squid mating.)
The examination of the stomach did not reveal the squid's last meal but Dr Norman was not expecting too much as squid use their sharp teeth to "puree" their food into tiny pieces. Their esophagus runs through their doughnut-shaped brain and large meals can leave the squids with serious headaches.

All well-written and true! Except for one thing: squid do not use their "sharp teeth" to "puree" anything. They use their sharp beaks to take relatively small bites, which are then swallowed whole. Squid have no teeth in the conventional sense of the word. They have a toothed tongue, called a radula, that is just a little rougher than a cat's tongue, and works velcro-style to grab bites of food and move them down the esophagus.

Want to know more about how squid eat?

Comments

Can we really tell that squid get headaches?

Danna Staaf's picture
Er . . . artistic license, I think. There are apocryphal stories of dead squid being found with pieces of fish bone lodged in their brains, though.

I was under the impression that a squid male handed the female a sperm packet, which she placed under / in her mantle until she was ready to use it Am I confused?

Thanks.

Danna Staaf's picture
No, you're right--for some species! Sperm always comes packaged (the packet is called a spermatophore) but the method of transfer and location of storage vary. For many species, it isn't well understood at all.

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