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Greg.Wood

Tiny Devonian Echinoderm and possible Bryozoans

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Greg.Wood

All specimens come from the Devonian aged Arkona formation.

 

1. Echinoderm, possibly a blastoid

Tried taking another pic...still not quite sharp

_16C6994.JPG.5c8b260972833ca8ab8bbf9b39810f87.JPG

_16C6965.JPG.794512cf9cd38a81d703401260bd8697.JPG

 

2. Unknown, possibly bryozoans (remainds me a bit of Evactinopora)

_16C6955.JPG.28558a3717fda61d17c7c1cff75269ff.JPG

_16C6950.JPG.39fcc5b184a53b20a88121b9bca74946.JPG_16C6953.JPG.2d6c4bff3878d1a27a9a2c9ba5c77896.JPG_16C6954.JPG.042b55f0ce541c7e4f5a4e124cda972a.JPG

 

3. Unknown, probably the inner structure of ostracods

_16C6985.thumb.JPG.0604281d4efb00043843ff9eff62e546.JPG

With these being the outer shell:

_16C6984.thumb.JPG.94cd19f52b0a189f4c0b27608020a4b6.JPG

 

4. I posted these about a month ago but I don't think we figured it out. Now I am pretty sure they are scaphopods.

5a6e2ab668e36_Mollusca-Scaphopoda(2).thumb.JPG.1307cb2ba2703491aeb33996006b1a51.JPGMollusca-Scaphopoda.JPG.569f0fda7ae2d69f0ced3abb9e358ed5.JPG

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Al Dente

Number two look like crinoid columnals.

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Greg.Wood
2 minutes ago, Al Dente said:

Number two look like crinoid columnals.

Could be, but the shape seems very irregular. Maybe preserved a different way or very worn out. These are the common crinoid bits I'm finding for comparison:

_16C6967.thumb.JPG.64ebcf7236899cce95b0f899bfab6aa5.JPG_16C6969.thumb.JPG.b661b82056cfded7cf7e0087d9b80bdb.JPG_16C6979.thumb.JPG.36c97afcc9233ceb85bd5fbab93eed48.JPG

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Kane

The crinoid ossicles usually have a good degree of symmetry, so the second picture in the initial post doesn't quite give me a crinoid columnal vibe. I'll have a look in my literature...

 

They seem to most closely resemble crinoid arm bits. I've seen a few that have that kind of irregular-radial nubs appearance. This is just a best guess based on these pictures, and I'm still uncertain.

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Darktooth

Very interesting items!

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abyssunder

I'm pretty sure that the first one (1) is a blastoid calyx, although your pictures are a bit blurry.
 The second ones (2) have patterns that make me think they might be crinoid columnals, as it was said by Eric really right, according to the central hole which might be the lumen. Try to compare them with the specimens close to yours from the picture below.

img47.thumb.jpg.c27326ed25b242723d035c0e14b2b750.jpg

(It don't has anything related to Evactinopora, I'm affraid.)

 

Nice pictures BTW, thank you for them.

The last three ones shows: 1 - columnals, 2 - spines and brachials, 3 - arm fragments, probably of biserial arms. (in my understanding)

 

 

 

 

 

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Greg.Wood

@abyssunder Thanks! I can see the resemblance between #2 on the original post and 8/9/10 on that plate. I'll get a clear shot of the blastoid tonight since the first one didn't turn out.

 

@Shamalama That pdf will be very useful, I'll have to start taking a closer look at these ostracods. I sifted through 4 buckets of mud this winter so I'll have to post everything I found at some point.

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doushantuo

the ostracods might even be useful paleo-ecologically speaking(e.g.presence of Thuringian ecotypes,but also valve ratios,possible presence of instars,velar dimorphism)

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Packy

Attached are some crinoid sections( all photos are 5.5x8.5 mm), which I assume are holdfast sections from the mississippian,and Ordovician similar to yours. very nice finds I will have to visit that area. Packy

Crinoid stem section-Miss.New Providence-Scott Co.#37.jpg

Crinoid stem section-Miss.New Providence-Scott Co.#42.jpg

crinoid disc-Ord. Maysville Ky Kope-fairveiw.jpg

Crinoid stem section-Miss.New Providence-Scott Co.#23.jpg

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