Unknown marine organism

Images made through a microscope. All subject types.

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pwnell
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Location: Tsawwassen, Canada

Unknown marine organism

Post by pwnell »

Found another weird thing in my reef aquarium. It attaches to the live rock / coral and seems to be filter feeder. I did discover nematocysts on its tentacles so it seems to sting its prey. I also found diatoms in its stomach. They seem to be colonial as I have never found them alone.

First a (close to) 1:1 macro shot of the organisms in their natural environment:
Image


Under the microscope under dark field illumination (4x) they look quite different:
Image

A single polyp with a 10x objective, dark field:
Image

41-image stack with 10x objective, 1.6x magnification, DIC
Image

Single image, 20x objective, DIC
Image

Finally, to show the contents of its gut, here is a photo under fluorescent excitation (UV/Blue), 40x objective. The red stripes are diatoms, not sure what the green blob is and also not sure why its oral disk fluoresces yellow.
Image

rjlittlefield
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Post by rjlittlefield »

Possibly one of the "moss animals", Ectoprocta. Details are different from the fresh water species I'm familiar with, but the general body shape and habit look similar.

--Rik

Jacek
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Post by Jacek »

beautiful

Ecki
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Post by Ecki »

Great darkfield shots!

Bruce Taylor
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Post by Bruce Taylor »

Not my bailiwick, but...they look Hydrozoan, to me. Some kind of Obelia, maybe? Pennaria? Halecium? There seem to be a million flavours. :D

A key to the sessile hydrozoa: http://hermes.mbl.edu/publications/biob ... /pdf/2.pdf

naturephoto1
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Post by naturephoto1 »

Waldo,

Beautiful, well done work and images.

Rich

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