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
Eliza writes, “A researcher from Lehigh University has invented a light-based pacemaker for fruit flies, and says a human version is ‘not impossible.’ The pacemaker relies on the new technique of ‘optogenetics,’ in which light-sensitive proteins are inserted into certain cells, allowing those cells to be activated by pulses of light. Here, the proteins were […]
San Francisco recently doubled the number of walls it was coating with hydrophobic paint, which is supposed to deter wall-pissing by making the urine spray back all over the pee-er.
“A sneezing monkey, a walking fish and a jewel-like snake are just some of a biological treasure trove of over 200 new species discovered in the Eastern Himalayas in recent years,” reports the World Wildlife Foundation today.
It’s time for a power upgrade — throw out that tired-out power strip and swap in this family-size USB charger, packed with 6 high-speed ports. With a built-in control chip, Kinkoo optimizes each port to ensure the fastest charging possible for all your devices. The Kinkoo is made from high-grade and durable materials so you […]
Watching Netflix, Hulu or other streaming services can unfortunately be difficult while traveling outside the US. Rather than bypass these restrictions with the help of a complex and slow VPN, choose a faster and simpler solution with Getflix. Instead of rerouting all your Internet traffic through a different server, this handy service only routes the […]
Shake, stir, and muddle your way to delicious homemade cocktails with this must-have bar set. Expect only the finest quality tools from MakersKit — enabling you to unleash your inner mixologist.Top 12 Favorite Things of 2014, Sunset MagazineQuart-size vintage-style Mason jar shakerRetro double jigger for accurate measurementsStrainer & spouts for a mixologist-style smooth pourHardwood muddler […]