Search the Community
Showing results for tags 'cystoidea'.
-
Cystoids from the Ordovician (485.4±1.9-443.8±1.5 million years).
Svetlana posted a topic in Member Collections
Hello to all. 4 cystoids from my collection. Found in the Leningrad region of Russia. Replaced by calcite. Size: from 25mm * 23mm * 17mm to 30mm * 30mm * 27mm. Have a nice day VID_20240128_100819.mp4 VID_20240128_100845.mp4 VID_20240128_100903.mp4 VID_20240128_100922.mp4 VID_20240128_100942.mp4 VID_20240128_100958.mp4 VID_20240128_101012.mp4 -
We've been finding these oddball puffy stars in the Late Ordovician (Sandbian) of eastern Missouri (Illinois Basin), in the uppermost part of the Plattin Group (a Platteville equivalent) or possibly the lowermost part of the Decorah Group (Katian). We've been finding a lot of weird fossils in that zone, including articulated cyclocystoids, but these I'm at a loss on. They seem to be calcite and preserve in the same texture and color as other echinoderm material in the same rock. They vary in convexity and in the presence of a central hump or divot, but there never seems to be a lumen that goes all the way through as far as I can tell. Some possibilities: stelleroid crinoid (but where anatomically? cystoid (but where anatomically? Up for other ideas or insights. Seen anything like this before?
-
Question about Cystoids and their food catching/feeding mechanism
Sallent posted a topic in General Fossil Discussion
I bought this fossil the other day. It is two cystoids from the middle Cambrian, apparently from Idaho. I was looking for more information as to how they caught their food, perhaps their mouth/digestive processes. I seem to find a lot more about crinoids than I do these guys. Part of my curiosity is that I've seen fossils of crinoids with rather well-preserved tube arms showing decently sized pinnules to catch floating food particles, however, the few pictures of cystoid fossils I've come across seem to show thin arms and I can't really see any pinnules preserved. It just kind of peaked my curiosity about how these guys would have caught their food and transported it to their mouths. I also can't seem to find any pictures of fossils showing the mouth structure of these creatures. I'm relatively new to fossils, so any help is appreciated. I'm sure someone is bound to know more about these things or have a fossil that shows these things in more detail. Any help is appreciated.