A Choanoflagellate and Lacrymaria

Images made through a microscope. All subject types.

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dy5
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Joined: Sun Feb 07, 2010 7:50 pm
Location: College Park, MD

A Choanoflagellate and Lacrymaria

Post by dy5 »

A couple of photos of creatures living in my neighbor's backyard pond.

The first is a group of choanoflagellates, possibly Salpingoeca sp., sitting on a spherical algae, Golenkinia sp. (I think). A quick bit of research turned up that the choanoflagellates share a common ancestor with all multi-cellular creatures making them well-studied by evolutionary biologists. If anyone's interested, there's basic information here: https://www.cell.com/current-biology/fu ... 05)00142-9 The creatures are very common, but I hadn't noticed them until they started showing up sitting on the algae spheres. Is it weird that I think they are really cute?
Choanoflagellates 3-1.jpg
The second image is from my first encounter with Lacrymaria. There are fascinating videos of this creature, including the award-winning video by Charles Krebs. However, they are even more spectacular and bizarre in person. Given the animal's thrashing around, it was sheer luck to get a frame with the mouth and almost all of the neck in focus.
Lacrimaria copy 3.jpg
Both photos taken with DIC and high-speed flash.

dy5
Posts: 33
Joined: Sun Feb 07, 2010 7:50 pm
Location: College Park, MD

Re: A Choanoflagellate and Lacrymaria

Post by dy5 »

Adding a photo to show the length of the choanaflagellate flagellum (hence the odd orientation). Also this one had just ingested its lunch.
Attachments
Choanoflagellate long flag.jpg

rjlittlefield
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Re: A Choanoflagellate and Lacrymaria

Post by rjlittlefield »

These are lovely!

--Rik

dy5
Posts: 33
Joined: Sun Feb 07, 2010 7:50 pm
Location: College Park, MD

Re: A Choanoflagellate and Lacrymaria

Post by dy5 »

Thanks!

Cheers, David

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