Phylum Annelida Part 2: Polychaeta (Segmented Marine Worms)

Now that we are familiar with the characteristics of annelids, let's zoom in on the polychaetes, which are the segmented marine worms. What do these worms do in the sea all day long? How are they different from land worms? Let's get a closer look!
Script by Ryan Helcoski
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[@paintbrush3554]

The thumbnail is terrifyingly

[@tobiaszczarnota7879]

Terrifyingly what?

[@HH-ru4bj]

We lost him.

[@yourweirdplant]

​@@HH-ru4bjlost him to the worms man

[@jomaugar]

Great material! Thanks a a lot!

[@ournextarc]

Okay, who else saw the thumbnail and thought Meshuggah just dropped a new single?

[@noswim]

Thanks Dave, another successful explanation!

[@Gman6365]

At 2:40, did you mean 'crevices' not 'cervices'?

[@jamieweir645]

I used to dig these babies up for sea fishing, one of the best fresh baits around. We call them Ragworm over here, or "Raggies" 😁

[@georgemoore-wg5jj]

Hi Jamie🌹🌹 How are you doing?

[@sciencenerd7639]

Wow, another brilliant video! Thanks!

[@yourweirdplant]

Babe wake up, new professor dave video dropped

[@noswim]

im here

[@xzgames7210]

Dave, pls Make the playlist about Physical Chemistry We need to watch! Thanks for this fabulous zoology's video

[@sloppyking7661]

Hey Dave I know this probably wouldn't be your kind of video but I recently watched a video titled The History of The Entire World... I Guess and I would love to see your reaction to it I really do think you'd get a kick out of it Anyway just thought I'd throw that out there

[@Huzaifa3620]

Have you forget to add "sir " 😒 Respect b koi cheez hoti he 🙄

[@deadboyzX8]

thank proff dave

[@FailingFalsely]

yo just saw an ad and you were in it. congrats on that.

[@ProfessorDaveExplains]

Someone else said that. What ad? I’m so confused.

[@FailingFalsely]

I don't remember what it was for but i was watching a scimandan playlist when it popped up.@@ProfessorDaveExplains

[@FailingFalsely]

@@ProfessorDaveExplains found it again it’s 100% your voice and I think your content. Called Chegg I assume you have like partnership with them or something.

[@ProfessorDaveExplains]

OHHH yeah I did some content for Chegg, I guess they made an ad for it.

[@FailingFalsely]

Well still congrats on that. Also if you google your name you get nothing but James Tour videos and that's hilarious. @@ProfessorDaveExplains

[@bag2363]

You should make some videos about music theory

[@ProfessorDaveExplains]

i plan on it!

[@SkinkUA]

Dave on his way to make a video on every animal ever

[@JS-qk6th]

Thank you for your truth speech

[@lmoral222]

I love you bro.

[@_ninthRing_]

The more I learn about the evolution & sheer diversity of Life on Earth, the more fascinated I become... Many of these wormy critters have body plans going way, way, back to the end of the Ediacaran period, (over 540MYA - predating even the Cambrian Explosion), where their deep burrowing modification of the ocean beds may have helped increase the oxygen content of the water column, thus stimulating the development of greater diversity of complex Life. [ en.m.wikipedia.org/wiki/Cambrian_substrate_revolution ] ~ ~ ~ I've known about the giant Pompeii Worms (which proliferate near deep sea hydrothermal vents) for decades, yet I never knew that they were closely related to the free swimming, many-setae-ed kind of Polychaete Worms. Pompeii Worms are just so radically different, with the bizarre internal structure (Coelom) replacing pretty much their entire insides with a habitat for symbiotic bacteria (which convert Hydrogen Sulphides, extracted from the hydrothermal vent water, into nutrients).

[@billyr2904]

5:56 this one has a striking resemblance to centipedes, with this being an example of convergent evolution.

[@justsomenightowl7220]

I thought the same thing!

[@fasbazawllfflen5427]

Actually it's not an example of convergent evolution, because this term refers to the convergence of function or structures related to their similarities. Polychaeta have parapodia, while centipedes have legs, and those structures don't have similar function or even structure. But it's very clear that the specimen that you refers is similar to centipedes in shape, but this isn't a case of convergent evolution.

[@gentlechimera]

Me n the boys learning of the Werms

[@CryptoRoast_0]

Come for the flat earth debunks, stay for the natural history.

[@samanthagrave1964]

You are incredibly smart

[@Naomi.Robertson]

Hate when the blood worms bite me while using them as bait

[@uncleanunicorn4571]

My only regret is no discussion of the ancient penis worm, Which was apparently responsible for a mass extinction back in the ediacaran period.

[@fasbazawllfflen5427]

Penis worms are Priapulids from the Priapulida Phylum, quite unrelated to Polychaeta actually.

[@donchristie420]

I like turtles

[@waelfadlallah8939]

I lik'em too 😊

[@barnabasrsnags4828]

Ew worms

[@HH-ru4bj]

We use the bristle worms for bait. Their mouths are a bit intimidating.

[@Mothobius]

Bro thinks he's something