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Plan 40x/0.65, DIC, diatom 90µm long, Olympus E-p2, Mediterranean Sea

Surprised to find what looks like Colurella in the sea, had though it a freshwater species.
Was having a look at the diatom when it came visiting, so I videoed it

Interesting. I saw many protists in my samples but they moved too fast to film. None was similar to this one though.

It is very nosey..

BillT

Bonjour
Intéressante vidéo et en plus jolie vidéo
Merci pour le partage
Cordialement seb

There is an sequence beginning at 36 seconds which gives an excellent view of the segmented foot.
Here is a short 2006 paper on "Rotifers in saltwater environments, re-evaluation of an inconspicuous taxon"
https://tinyurl.com/yac898tn

coominya wrote:There is an sequence beginning at 36 seconds which gives an excellent view of the segmented foot.
Here is a short 2006 paper on "Rotifers in saltwater environments, re-evaluation of an inconspicuous taxon"
https://tinyurl.com/yac898tn

Thanks for the link. According to the text, both Colurella adriatica and Colurella colurus have been found in the Mediterranean.

Found this drawing that distinguishes between them - not a lot in it.
I am going to go with: Colurella colurus

75RR wrote:
Found this drawing that distinguishes between them - not a lot in it.
I am going to go with: Colurella colurus

I would go with Colurella colurus too based on the picture, it's the lumpy bits that distinguish it. Those early biologists did a mammoth job cataloging them all.

Here is a page, "Species Search" http://rotifera.hausdernatur.at/Species ... rid-page=6

This is a Colurella uncinata bicuspidata, which more closely resembles the configuration of the (organelles?) specifically the big bulge at the rear. It's found in the Med as well.

Here is an Australian key to Colurella : https://www.dropbox.com/s/lwmbfsjnwoe6p ... s.pdf?dl=0
Note: Best viewed double page.
It includes this distinction between Colurella adriatica and Colurella colurus :

Excellent! I can use that as a reference for the local stuff. I have been going to a creek for my stocks but there is an extensive wetland area not far away so I'll go there next for some samples.

In a week I'm off to a coastal town called Illuka on the pacific ocean, (see attached pic). It's by the mouth of a large river and I intend to collect samples from rock pools by a bluff, 3 km north of the rivers mouth. Any suggestions on where to take them though would be appreciated.

That looks like a great place to visit ... and collect!
I would suggest gathering samples of different seaweeds (one per sample jar) as it is where all the animalcules go for protection.
Mind you do not let the water in the jars overheat on your way back - try and keep them cool.

A couple of links that you might find useful (apologies if you already have them) :
https://mdfrc.org.au/bugguide/resources ... pepoda.pdf
Last two are updated sections:
https://www.researchgate.net/publicatio ... onogononta
https://www.researchgate.net/publicatio ... onogononta

75RR's advice is excellent.
And, unless one is interested in inspecting silt, - in contrast to coarse sand, silt can be a severe nuisance on the slide, so it is better to avoid carry over of silt in the collected samples. To collect samples from the submerged rocks themselves, use a toothbrush, not a rigid blade of something.
Algae in closed jars filled with seawater at home are usable for maybe 2-3 days at the most (at normal RT), after which they decompose. The stench will keep people away from the house for miles around...

75RR wrote:That looks like a great place to visit ... and collect!
I would suggest gathering samples of different seaweeds (one per sample jar) as it is where all the animalcules go for protection.
Mind you do not let the water in the jars overheat on your way back - try and keep them cool.

Yes it's a beaut place to lose yourself for a few days. I'll look for the weed, I wouldn't have thought of that.
The files I've just downloaded, more for the collection, I have quite a few now but it will be winter soon and work slows so plenty of time to read them. Thanks.

Hobbyst46 wrote:75RR's advice is excellent.
And, unless one is interested in inspecting silt, - in contrast to coarse sand, silt can be a severe nuisance on the slide,

Algae in closed jars filled with seawater at home are usable for maybe 2-3 days at the most (at normal RT), after which they decompose.

Ok, that's good to know. They will take 3 to 4 days after collection to arrive back here as others will be bringing them back, I'm going down on the motorcycle.

Bonjour
Bonne récolte et endroit à air magnifique.
Merci pour le partage et bonne continuation.
Cordialement seb