More from the pond - Rotifer?

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Shivs
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Location: Vancouver, British Columbia, Canada

More from the pond - Rotifer?

#1 Post by Shivs » Thu Mar 11, 2021 11:39 pm

Hi Guys... I spotted this guy last night from my pond sample. No idea what it is, its about 100 um from end to end. Any ideas?
I set up a web server to host my vids, let me know if its working.


http://office.shivs.org:5080/1.mp4

Placozoa
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Re: More from the pond - Rotifer?

#2 Post by Placozoa » Fri Mar 12, 2021 12:32 am

Video is working fine. :)

In order for me to identify her I need to see her beak (mastax and trophi) which is halfway down her throat, looks like a diatom, and is often moving. I find it tough to get a good look and I always need to use the 40x or 60x objective and a coverslip to accomplish it. I am lousy at identifying stuff, but I still try.

I say beak because rotifers branched from cephalopods (octopus, squid,...) 680 million years ago and they have a lot in common. Its not actually called that.

Shivs
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Re: More from the pond - Rotifer?

#3 Post by Shivs » Fri Mar 12, 2021 1:07 am

But, it is some sort of rotifer? thats good enough for me :D

Placozoa
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Re: More from the pond - Rotifer?

#4 Post by Placozoa » Fri Mar 12, 2021 1:25 am

I am going with yes, that sure looks like a rotifer to me. :D

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actinophrys
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Re: More from the pond - Rotifer?

#5 Post by actinophrys » Fri Mar 12, 2021 4:45 pm

There's nothing wrong with just leaving it at rotifer if you're happy with that...but know there are a lot of types that are easy enough to recognize at a glance. This one is a Monommata, as shown by its long mismatched toes.

Whether rotifers and cephalopods have a lot in common is I guess a matter of taste. They don't share much that they don't also share with a whole lot of other groups.

DonSchaeffer
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Re: More from the pond - Rotifer?

#6 Post by DonSchaeffer » Fri Mar 12, 2021 11:01 pm

Rotifers move with a push-pull motion. They don't glide smoothly like that. They also move a lot of water using the cilia around the mouth. Neither of these behaviors are shown by that ciliate.

Placozoa
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Re: More from the pond - Rotifer?

#7 Post by Placozoa » Sat Mar 13, 2021 12:50 am

https://www.youtube.com/watch?v=PlMLfCKx29A

I have some of these. When they arent under a coverslip, they glide around like that, then when they feel like it, they stick that toe to the substrate, do kind of a handstand and slurp up bacteria. Not all of them move around like caterpillars. I mighf be wrong, but I dont think so, having followed it up some.

Cephalopods can glide or walk, whatever they want. Only makes sense to me that rotifers could too.

Actually tough to find a good video of an uncoverslipped rotifer.

https://www.youtube.com/watch?v=Ew4ryjxXHNk

Heres a coverslipped one gliding around a bit at 100x.

juankax
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Re: More from the pond - Rotifer?

#8 Post by juankax » Wed Apr 07, 2021 9:03 am

Rotifers move with a push-pull motion.

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Last edited by juankax on Tue Apr 13, 2021 4:27 pm, edited 1 time in total.

Bruce Taylor
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Re: More from the pond - Rotifer?

#9 Post by Bruce Taylor » Wed Apr 07, 2021 12:59 pm

juankax wrote:
Wed Apr 07, 2021 9:03 am
Rotifers move with a push-pull motion.
Some do. Many don't. ;) It's an astoundingly diverse group!

Actinophrys (Josh Grosse) identified this critter as Monomatta and you can trust him on that. Here's another video showing the same critter: https://www.youtube.com/watch?v=qcBA1F15wdg

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