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piranha

Textbook Oligocene Seaweed

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piranha

Today this beautiful Oligocene aquatic plant arrived. It is a magnificent specimen of Cystoseirites partschii. This example showcases the articulated apical and basal regions and miraculously preserves some of the reproductive structures of conceptacle and receptacle morphology. The apical portion of the plant, which is shed annually, also preserves a 3D pneumatocyst (air vessicle) also present during fertile periods and allowing flotation and optimal photosynthetic exchange for this robust and highly successful phaeophyte (= extant Cystoseira: brown algae / kelp).

Enjoy :D

Cystoseirites (=Cystoseira) partschii

Late Oligocene - Southern Caucasus

post-4301-0-49237200-1331164485_thumb.jpg post-4301-0-05553100-1331164493_thumb.jpg post-4301-0-38651500-1331164502_thumb.jpg

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paleozoicfish

Beautiful and I love that some of sexual anatomy is present! Great acquisition.

Spectacular!

-PzF

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Auspex

Oh my!

Besides being a spectacularly preserved specimen, it is an incredibly beautiful fossil :wub:

My envious and heartfelt congratulations!

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AgrilusHunter

Very, very nice! Congratulations on a great addition.

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Bullsnake

Certainly is awesome! Congratulations!

Is that a bryozoan encrustation on your first picture, also?

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piranha

Thanks guys for the nice comments :D

Certainly is awesome! Congratulations!

Is that a bryozoan encrustation on your first picture, also?

Probably not Steve... just a strange digital artifact from the angle of the light source. Looking at the photos again I'd say my attempt to bring out the fine detail caused other anomalies in appearance. Here is another image with softer lighting that shows a closer approximation of actual surface texture.

I might need a better camera one of these days :pic: :P

post-4301-0-48678100-1331171383_thumb.jpg

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Missourian

That is very nice. Your description is so good, I was impressed even before I saw the images. :)

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piranha

Thanks Missourian emo31.gif

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squalicorax

Nice to see some marine flora. I dont recall seeing much on the forums.

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piranha

Nice to see some marine flora. I dont recall seeing much on the forums.

Follow this LINK for additional examples of Phaeophyta from the Monterey Formation in California.

Thanks Nathan :)

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Wrangellian

Aha! That one caught my eye too but went above my budget... I'm sure it has a good home now, thanks for posting it, Scott.

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Shamalama

That is a cool plant. I like how it has fossil worm tubes associated with it as it likely did in life.

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piranha

Thanks Eric and Dave

Dave,

The round objects are actually the conceptacles. The image posted should have indicating arrows and a good diagnostic diagram to illustrate the description. During the fertile period the receptacle fronds become swollen with the presence of conceptacles. As this taxon is dioecious, the conceptacles will bear female or male gametes, but not both. The morphology and life cycle of this organism is fascinating.

My new favorite fossil... for now! :P:D

post-4301-0-98665100-1331311193_thumb.jpg

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Shamalama

Ok, I'll buy the Conceptacle concept but I see spiral shapes in some of those bumps, kinda like Spirorbis. Maybe it's the lighting but below are examples of what I'm comparing them to.

post-1408-0-07329100-1331383464_thumb.jpg

post-1408-0-76442200-1331383483_thumb.jpg

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piranha

Conceptacle Concept? That is priceless! emo31.gif

Yes, after looking again, those do appear to be similar to the Spirorbis in your photos. The conceptacle / receptacle frond is directly above the 'cl' in the very first photo. A few tiny ostioles also appear to be present but my camera is not suited for super-macro at a distance of 2 cm or less. With luck the fossil will eventually be evaluated directly by a marine algae specialist and will report back any details. Thanks again everyone for the great feedback :)

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pleecan

That is indeed beautiful specimen Scott !!! Congratulations on this spectacular acquisition :D

Edited by pleecan

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piranha

That is indeed beautiful specimen Scott !!! Congratulations on this spectacular acquisition :D

Thanks Peter :fistbump:

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Shamalama

The conceptacle / receptacle frond is directly above the 'cl' in the very first photo.

Ah, I see it now. Thank you for the pointer!

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astron

What an amazing in size, appearence, preservation and importance specimen you have brought again, Scott :wub:

That's one more spectacular gem in your ''The collection'' jewellery B)

Congratulations :fistbump:4.gif

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piranha

Thanks Dave & Astrinos Thumbs%20Up.gif

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RCFossils

Wow! what a beautiful fossil

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piranha

Wow! what a beautiful fossil

Thanks Rob :D

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