Look at this squid's eye. Just look at it. See anything eerily familiar?
Squid, along with the rest of the family Cephalopoda, haven't shared a common ancestor with us vertebrates in some 500 million years—long before the evolution of our camera-like eyes. And yet, there the cephalopods are, flagrantly swimming about with eyes that use a lens to project an image onto a retina. Call it Squid Eye for the Vertebrate Guy. So, how's it work?
Convergent evolution, my friends. Convergent evolution. We happened to hit on similar solutions to the same problem of sight, even though the eyes of vertebrates and cephalopods evolved separately, in very different ways, at different times. Today, we can see that legacy in cephalopod and vertebrate fetal development. With vertebrates, the eyes grow on stalks, reaching out from the brain. In cephalopods, the eyes start as a clumping of cells on the surface of the skin and reach backwards, into the head, to make brain contact. Similar destinations. Very different road maps.
This lovely illustration—featuring dissections of the head, funnel, mantle and eye of a Thaumatolampas diadema—comes from The Cephalopoda Part I: Oegopsida and Part II: Myopsida, Octopoda Atlas written in 1910 by zoologist Carl Chun following a German expedition to the Indian, Atlantic and Great Southern oceans.
You can see more of Chun's detailed, passionate illustrations at the BibliOdyssey blog.
Image: Some rights reserved by peacay
Backed by huge donations from vitamin companies, the American Association of Naturopathic Physicians is pushing to get naturopathic medicine recognized and regulated in all 50 US states, paving the way to receiving public funds in the form of Medicare reimbursements.
In California today, a grand jury indicted the Plains All-American Pipeline and one of the oil company’s employees on criminal charges over the massive 2015 oil spill in Santa Barbara County.
Thomas Manning, 64, is recovering after receiving the first penis transplant in the United States. Manning had his penis amputated in 2012 due to penile cancer. It took 15 hours for surgeons at Massachusetts General Hospital to complete the transplant, medically known as a “gentitourinary vascularized composite allograft.” The surgery involved “grafting the complex microscopic […]
Jared Sinclair developed the RSS reader app Unread, which made $10,000 in its first 24 hours on the iOS market. And we’ve all heard the story of Flappy Bird developer Dong Nguyen, whose creation was reportedly earning $50,000 a day at the height of its 2013 explosion. While those are rare examples, they’re also testament to the […]
If you or your company’s IT system are besieged by black hat cyber attacks, an ethical hacker might be all that stands between crippling damage and a company’s long-term prosperity. It’s no wonder that the market for IT security specialists is exploding. Certification is the key – so learn the tenets of ethical hacking and get […]
Your laptop and mobile devices are top of the line…so why are you trotting out that raggedy decades-old suitcase when you go somewhere? Time to up your travel game with a complete 5-piece Herschel Travel Luggage bundle…and we’ll even give it to you for free!Of course, you’ve got to win the Ultimate Herschel Travel Bundle […]