mkspsa Posted March 7, 2023 Share Posted March 7, 2023 (edited) I was going through some material I collected circa 2001 and found a crinoid that is not familiar to me. Any ideas would be appreciated. This is from the Mineral Wells Dump borrow pit, aka the Fossil Park. Top and bottom, scale bars in mm. Mike Edited March 7, 2023 by mkspsa 1 3 Link to comment Share on other sites More sharing options...
connorp Posted March 7, 2023 Share Posted March 7, 2023 Nice specimen. Can't help with the ID, but I will attach this Pennsylvanian Echinoderm Guide from the DPS if you haven't seen it. 2098362063_PennsylvanianEchinodermGuide.pdf Link to comment Share on other sites More sharing options...
ClearLake Posted March 7, 2023 Share Posted March 7, 2023 In McKinzie and McLeod's 2015 Color Guide to Pennsylvanian Fossils of North Texas, there is a Lecythiocrinus (White 1879) on page 200 that looks very similar to your specimen with all the numerous, smooth polygonal plates. . 4 Link to comment Share on other sites More sharing options...
mkspsa Posted March 8, 2023 Author Share Posted March 8, 2023 That's got to be it. Embarrassing that I didn't check more carefully. Thx. Link to comment Share on other sites More sharing options...
mkspsa Posted March 9, 2023 Author Share Posted March 9, 2023 Its interesting. I started digging a bit and I don't think the Color Guide is correct. White describes Lecythiocrinus as having 3 basal plates, 5 subradials, and 5 first radials for a total of 13. His images are figures 4 and 5 in the yellow page below. And in Moore and Strimple (citation below) Lecythiocrinus asymmetricus is figured in Plate 4, 1a, 1b, and 1c. Neither of these looks anything like my specimen or the one in the Color Guide. From Index Fossils of NA this looks more like Acrocrinus. I need to look at the Treatise. Moore, R.C.; Strimple, H.L. Lower Pennsylvanian (Morrowan) crinoids from Arkansas, Oklahoma, and Texas. University of Kansas Paleontological Contributions, Echinodermata Article. 60 (12): 1–84. 1973 Link to comment Share on other sites More sharing options...
ClearLake Posted March 9, 2023 Share Posted March 9, 2023 11 hours ago, mkspsa said: Its interesting. I started digging a bit and I don't think the Color Guide is correct. Well dang, I agree that doesn't look much like it. I'm no crinoid expert, but it doesn't even seem close. The book does say "there appears to be more plates on the specimen than the other described species..." but even so, it still seems quite different. The illustration in the Treatise of Lechythiocrinus is identical to what you have shown above and none of the other members of the family look any thing like your specimen. I unfortunately do not know enough about crinoid classification to even narrow it down, short of paging through all 1000 pages of the Treatise to try and find soimething similar. Maybe @crinus could point you in a better direction. Sorry. 1 Link to comment Share on other sites More sharing options...
ClearLake Posted March 9, 2023 Share Posted March 9, 2023 11 hours ago, mkspsa said: looks more like Acrocrinus. I missed your suggestion here. Yes, that looks much closer. In looking through the Treatise, there are several genera in the family Acrocrinidae such as Globacrocrinus or Dinacrocrinus that might be even closer and appear to be the right age. Interesting... 2 1 Link to comment Share on other sites More sharing options...
mkspsa Posted March 9, 2023 Author Share Posted March 9, 2023 Excellent. Based on the number of rows of plates, it's more like Globacrocrinus. I'll read the Treatise descriptions. Thanks. Link to comment Share on other sites More sharing options...
crinus Posted March 11, 2023 Share Posted March 11, 2023 Sorry but I didn't see this till just now. I have been busy cleaning a plate of Acrocrinus so when I saw the first pic, that is exactly what I thought. Then I followed the thread and agreed with CLearLake not looking at anything carefully. But in the end I have to agree that it is some kind Acrocrinid. Glad you got there without my help not that I would have been of any help. I am just not all that familiar with Pennsylvanian material. Not much of that around here. Joe Link to comment Share on other sites More sharing options...
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