Crinoid?

[Fullux]

Been finding a few of these at one of my usual crinoid spots in Northern Kentucky. I think it's just another species of crinoid but I'm not sure. The other crinoid I've been finding here is Taxocrinus whitfieldi.

[digit]

Yup. Nice association of crinoid columnals forming a decent length of stem.

 

You say these columnals appear different from the primary crinoid species you are finding at this site?

 

 

Cheers.

 

-Ken

[Fullux]

1 hour ago, digit said:

Yup. Nice association of crinoid columnals forming a decent length of stem.

 

You say these columnals appear different from the primary crinoid species you are finding at this site?

 

 

Cheers.

 

-Ken

Yeah, the typical species i find in this area is Taxocrinus whitfieldi (pictured below), but I started looking in a lower layer and have been finding a bunch of this species.

[Fullux]

Ok, so I was trying to find some other examples of this species in my collection but strangely other than a small one, all I found were of T. whitfieldi, I guess I just haven't taken a look at them all. Meaning this is one of the first examples I've found of this species.

Edited February 18, 2023 by Fullux

[Fullux]

Anyone know anything about mississipian crinoids?

[Kato]

Could they be part of a the crinoid 'arm'?

[Fullux]

37 minutes ago, Kato said:

Could they be part of a the crinoid 'arm'?

Possibly, looking into it

[BobWill]

43 minutes ago, Kato said:

Could they be part of a the crinoid 'arm'?

These have full-circle cross-section. On an arm brachial the circle would be interrupted by a food groove. Uniserial ossicles look like little pac man profiles.

Edited February 19, 2023 by BobWill

[ClearLake]

4 hours ago, Fullux said:

Anyone know anything about mississipian crinoids?

I know that trying to identify crinoids is difficult from just a portion of the stem.  I also know that it is virtually impossible without having a clear picture of the end showing the pattern of the lumen and associated features. 

[DPS Ammonite]

See good article that gives species names to disks.

 

Moore, R. C., and Jeffords, R. M., 1968, Classification and nomenclature of fossil crinoids based on studies of dissociated parts of their columns, Univ. Kansas Paleontol. Contrib., Echinodermata, Article 9:1–86.

 

https://kuscholarworks.ku.edu/handle/1808/3820

 

 

Edited February 19, 2023 by DPS Ammonite

[ClearLake]

2 minutes ago, DPS Ammonite said:

See good article that gives species names to disks

Yes, good suggestion, I should have referenced Moore and Jeffords as it is the go to publication for ID’ing isolated columnals. Thanks. 

[Fullux]

11 hours ago, ClearLake said:

I know that trying to identify crinoids is difficult from just a portion of the stem.  I also know that it is virtually impossible without having a clear picture of the end showing the pattern of the lumen and associated features. 

Here's the clearest picture I could get

[ClearLake]

On 2/19/2023 at 9:51 AM, Fullux said:

Here's the clearest picture I could get

 

I still can't tell you any more than it is a crinoid columnal.  My suggestion, if you are interested in a more specific ID, would be to pull up the reference that @DPS Ammonite provided and with the fossil in hand go through and see if you can find anything that comes close.  Details are important and pictures probably don't do it justice.  Good luck!

[Fossildude19]

Not a lot of detail in the furnished photos. Blowing it up doesn't help, at all.

 

[HelicoprionChristian]

On 2/19/2023 at 10:00 AM, Fullux said:

Possibly, looking into it

Looks more to me like the stem of a crinoid, based on the columnals apparent in the first and second picture, though I couldn't tell you what kind of crinoid it is, and am no expert on the matter.