Brevicoceras casteri, with Hederella filiformis

Brevicoceras casteri,  with an example of Hederella filiformis. 

According to their 2008 paper,  "Morphologies and Affinities of Hederelloid "Bryozoans"  ", Paul D. Taylor and Mark A. Wilson "... interpret hederelloids as colonial, phoronid-like invertebrates, with retractable lophophores."

Thanks to Scott (piranha) for the paper listed above.  

Middle Devonian,
Moscow Formation, Hamilton Group.
Deep Springs Road, Lebanon, NY.

Generously gifted to my by Darktooth (Dave)