Please help me ID these critters

Images made through a microscope. All subject types.

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Please help me ID these critters

Post by pwnell »

They all were from either fresh or marine water.






Charles Krebs
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Post by Charles Krebs »

I'll leave the first two diatoms to the diatom experts.

The third image looks quite a bit like a species of Mallomonas. But normally the chloroplasts "fill" the body.

The fourth looks like Acanthocystis.

The last looks like Pleuronema. (A similar looking but much smaller creature, <30micron, is Cyclydium)

But by all means, do not count on my ID's! :wink: :cry: :wink:

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Post by rjlittlefield »

And one more, left side of the fourth image, looks like Spirogyra. (But don't trust me either! :wink: )


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Post by pwnell »

Thanks for the IDs. My "Pleuronema" is about 65µm long.

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re ID

Post by jc maccagno »

Hello Waldo

We are almost neighbors!

Agree with Pleuronema with feeding membrane up
Spirogyra + Acanthocystis Agree that first 2 are diatoms Can't help you with the remaining one.


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Post by carlos.uruguay »

The second picture probably diatom Cocconeis
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Post by Ferry »

Number 4 is Acanthocystis turfacea, a helizoon.

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Post by uaalgae »

The third image is indeed Mallomonas and it was in stress. This resulted in the formation of a resistant cyst called a statospore. This is a unique spore and found only in the Chryophytes. The statospore wall is siliceous and has a small pore at one end. If you look at old Dinobryon colonies, statospores are very common. Related to the diatoms.

My name is Donald W. Ott and I am a professor at the Uni. of Akron. My field of study is phycology and I am the microscopist in the Department. My YouTube name is uaalgae and I have been placing movies on the system for several months. I have seen marvelous and wondrous things![/i]

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