Oligochaeta anatomy under a microscope - Pristina sp. (DIC)

Earthworms are a typical model organism in biology and are often used to demonstrate internal organs and to practice the dissection of an animal. However, dealing with dead animals is honestly not that exciting. Microscopic freshwater worms can be great models to study the internal organs and their functioning in a living animal because of their transparent body. In this video, the Oligochaeta from the genus Pristina is used to demonstrate blood flow, the metanephridium (kidney) and the cillia of the digestive tract.
Microscope:
Olympus Vanox AHBT3 with DIC
Objectives:
Olympus UVFL 10/0.4
Olympus SPlanApo 20/0.7
Leitz NPL Fluotar 50/1,0 Oil
Camera:
Panasonic S1 connected with an Olympus NFK 2.5x photo eyepiece
Music: Icelandic Arpeggios - DivKid (TH-cam Music Library)
Sources:
commons.wikime... [Modified]
KÜKENTHAL - ZOOLOGISCHES PRAKTIKUM (Version 27)

[@ScottLawsonBC]

Absolutely fascinating video, so so cool to see the circulatory system

[@VANOXmicroscopy]

Thank you for the compliment :)

[@sauce530]

Your videos are so so good and well made thankyou friend 💯💯

[@Microscopy1]

Fantastic DIC-microscopy. Very informative, too. Thanks Vanoxm.!

[@VANOXmicroscopy]

Thank you :))

[@SLAUGHTEREDEYES]

my poor little scope can barely see this, but with dic and amazing optics all I can say is just wow.. wish i had the money to afford a dic scope, I fear I would never leave it.

[@VANOXmicroscopy]

I'm very happy you like it :)
Don't be put off please, it took me 10 years of hoarding equipment and getting experience to achieve what you see in this video. If you start with a used finite microscope from one of the big brands you will eventually get where I am right now and probably achieve even better results. So keep the hobby alive, it's so much fun!!!

[@Dr_SteveK]

What do they feed on? Are they dangerous or infectious?
Do they need a host?

[@Microscopyenthusiast]

Funny, I activated the bell icon for your channel long a go but I didn't get a notification for this video. This video is very detailed. Thank you. How did you manage the worm slowdown? Whenever I put a worm under a microscope it goes like a bullet train. Also, did you made the anatomy grafic by yourself? If so which software did you use?

[@VANOXmicroscopy]

TH-cam probably doesn't like me anymore because I didn't upload anything for 9 months (at least my thesis is over now ^^)
I "simply" increased the pressure of the cover glass on the worm by removing some water with a paper towel. This is also necessary in my case otherwise these high resolution objectives have poor performance (That's why I don't recommend them to beginners). So it's always a battle between getting good images and accidentally squishing the sample.
I stole the graphic from the internet and modified it a bit (Source is in the video description). I can recommend BioRender to create such illustrations though (they have a free version but only with a watermark, to remove it you have to do a monthly subscription as far as I know)