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Simple Animals: Sponges, Jellies, & Octopuses – Crash Course Biology #22

Hank introduces us to the “simplest” of the animals, complexity-wise: beginning with sponges (whose very inclusion in the list as “animals” has been called i…

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  • TheDoomAmbassador · April 2, 2013 at 11:29 pm

    The giant squid is real!
    A 14 meters long squid (NOT kraken, I mind you. These things are 20 m. long)! Ain’t it awesome? 


  • TheDoomAmbassador · April 3, 2013 at 12:01 am

    Crash course needs an exception on every show of theirs.


  • TheWight180 · April 3, 2013 at 12:44 am

    You are correct of course, but I am afraid that the term ‘octopi’ has become so widely used it is now accepted as just as correct as ‘octopuses’.


  • Aviel Menter · April 3, 2013 at 12:46 am

    Here’s the problem with that: pluralizing an “us” ending as an “i” ending is an English idiom as well as a Latin idiom. If you’re going to allow “octopuses” because it’s English, then you should also allow “Octopi” because it’s English. Though I agree that Octopodes is best.


  • Velox415 · April 3, 2013 at 12:49 am

    No ammonites? No nautilus? I am sad now. :(


  • Ultermarto · April 3, 2013 at 1:08 am

    I think we should pluralize Greek words in Greek, simply because it tells us something about their origin and it sounds pretty cool. While we’re at it, we should totally treat all Proto-German words as the Proto-Germans did.


  • Max Li · April 3, 2013 at 1:43 am

    unless you’re a sea sponge: unless you’re the mongols! 😀


  • janaepowell24 · April 3, 2013 at 2:33 am

    cephalopods are my favorite and I just want to be a cuttlefish so bad!!


  • kamu a · April 3, 2013 at 3:01 am



  • h00k3rb00ts · April 3, 2013 at 3:15 am

    Or you could be all scientific and just say the Order Octopoda….


  • kamu a · April 3, 2013 at 3:58 am

    Well it is now a English word and it follows the rules of the English language. Words that end in -us have a plural form of -i. Longlive the Octopi


  • captainparadoxius · April 3, 2013 at 4:46 am

    This debate happened a few hundred years ago in England. The same introverted classical scholars who are responsible for prescriptive beauties such as “don’t end a sentence with a preposition” and “no split infinitives” decided that all three are correct, since “octopodes” is linguistically correct, and the other two were to common in use to eliminate.

    Honestly, I think that octopuses should be the only acceptable form because I personally like the word, but to each his own.


  • Pedro Villarreal · April 3, 2013 at 5:38 am

    check the wiki for parthenogenesis


  • Pedro Villarreal · April 3, 2013 at 6:32 am

    “The offspring having all of the mother’s genetic material are called full clones and those having only half are called “half clones”. Full clones are usually formed without meiosis. If meiosis occurs, the offspring will get only a fraction of the mother’s alleles.”


  • Dacino Hoihe · April 3, 2013 at 7:03 am

    Squids… Cthulu is a squid..


  • 321seb · April 3, 2013 at 7:47 am

    does that mean that Rotifera replicate through mitosis? would that mean that their DNA is identical to their parents?


  • WatchingOctopus · April 3, 2013 at 8:33 am

    This highly concerns me.


  • SuperAppleheads · April 3, 2013 at 9:29 am

    He’s referring to a platyhelminthes, or a flatworm. They regenerate.


  • fanzaz54 · April 3, 2013 at 10:12 am

    Octopuses and octopi are correct according to my computer’s spell check, but when writing an English paper, I’d rather use octopi than have my teacher count it wrong :/


  • cookiemonkey777 · April 3, 2013 at 10:43 am

    Oops sorry Annelids not Nematodes! my mistake.


  • cookiemonkey777 · April 3, 2013 at 11:01 am

    Ummm platyhelminthes probably aren’t the type of worm you’re talking about. Worms that live in gardens are Nematodes and they’re much more complex.


  • bobbyjoejrfred · April 3, 2013 at 11:13 am

    Will there ever be a 4 layered organism?


  • SimonCHulse · April 3, 2013 at 11:13 am

    just cause they continue wiggling doesn’t mean they are still alive- turns out the wiggling is death throes.


  • SimonCHulse · April 3, 2013 at 12:10 pm

    5:28: Not true. you cannot cut a worm in half and have both ends live. I’ve tried. The two ends wiggle for a while and then die. 


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