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Small trilobite

aek

By aek
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aek Regular Member

aek

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Need help IDing this tiny trilobite. Racine Formation, IL. My guess is Cyphaspis (Otarion) intermedia. 

Is this correct? @piranha scale is .5mm

 

 

20211203_092445.thumb.jpg.a3a550dfff6764b896b3a9ade03f4b1b.jpg

 

20211203_094701.thumb.jpg.89ab3f30aa487622f4b587bea3bd3b5a.jpg

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Fossildude19 Regular Member

Fossildude19

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This looks like some sort of Encrinurinae.

LINK

    Tim    -  VETERAN SHALE SPLITTER

   MOTM.png.61350469b02f439fd4d5d77c2c69da85.png      PaleoPartner.png.30c01982e09b0cc0b7d9d6a7a21f56c6.png.a600039856933851eeea617ca3f2d15f.png     Postmaster1.jpg.900efa599049929531fa81981f028e24.jpg    VFOTM.png.f1b09c78bf88298b009b0da14ef44cf0.png  VFOTM  --- APRIL - 2015  

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aek Regular Member

aek

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@Fossildude19 Thanks, I'll have to do some reading. I thought it looked very similar to this Field Museum specimen judging by the pustulose glabella and small size, but hard to tell for sure. 

UC27874_fossil.thumb.jpg.dec19104096c7fbba5d6843d0f0d3880.jpg

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piranha Regular Member

piranha

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The Silurian encrinurids in the paper cited above don't have the large glabellar lobes.

 

The glabellar lobes are a match for Harpidella sp. (formerly classified as Cyphaspis).

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image.png.a84de26dad44fb03836a743755df237c.png

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