Unknown marine subject. Ideas?

[Charles Krebs]

I found these after clearing and cleaning some alga and diatoms off of a small rock. They are obviously "something" but I have no idea. Any thoughts?

They measure about 425 microns long by about 208 microns wide.

[René]

Interesting. Really that small??

Any kelp around?

Best wishes, René

[Charles Krebs]

Really that small??
Any kelp around?

Uhhhh.... no, not really
I measured the pixel dimensions from the web sized image rather than the full size image. They are about 425 x 206 microns. (I've corrected the original post. I thought that diatom looked awfully small! )

[kit1980]

May be empty spore capsules of some moss.

[carlos.uruguay]

Hi
Maybe algae
Maybe antheridium reproductive structure of Chara (or similar):
"Male reproductive structures, known as antheridia, are located on the male gametophytic shoots. An antheridium is sac-like and contains sperm, that may fertilize a female archegonium" (see this webpage)
http://blogs.ubc.ca/biology321/?page_id=512
Reproductive structures image
http://blogs.ubc.ca/biology321/files/20 ... ridium.jpg
(But Chara is mostly freshwater algae... )
Regards

[Charles Krebs]

I was cleaning off my tabletop an found a small container of water where I had placed a few of these. It seems they are seeds of some type...

[carlos.uruguay]

I was cleaning off my tabletop an found a small container of water where I had placed a few of these. It seems they are seeds of some type...

Hi Charles.
You rule out that those are antheridium?
Regards
carlos

[René]

I'm pretty sure of that as well. But which one...

René