This is a commonly found form of crinoid holdfast throughout the Cincinnatian. These disc shaped structures can be smooth or very bumpy. The remainder of the pentameric stem can be found in well preserved Lichenocrinus.
Lichenocrinus
This is a commonly found form of crinoid holdfast throughout the Cincinnatian.
These disc shaped structures can be smooth or very bumpy. The remainder of the
pentameric stem can be found in well preserved Lichenocrinus.
Cincinnaticrinus and Ectenocrinus are both known to
have this type of attachment.
Additional photos of Lichenocrinus
holdfasts
Radicular Cirri
"Root-like" structures extending from the sides of some stems for
attachment.
Plicodendrocrinus casei uses this type of attachment.
Coiled Stem
Some Cincinnatian crinoids use a coiled stem type of holdfast. It can be coiled
around itself or around another object.
Merocrinus, Pychnocrinus, Glyptocrinus
decadactylus, Iocrinus, Gaurocrinus,
Rhaphanocrinus, Xenocrinus and
the un-named Glyptocrinid use this type of attachment.
More photos of coiled stem holdfasts
Encrusting holdfast
 |
 |
This type of attachment is typified by Anomalocrinus incurvus.
More photos of encrusting holdfasts
General Identification
Stem Identification
The Dry Dredgers and individual contributors reserve the rights to all information, images, and content presented here. Permission to reproduce in any fashion, must be requested in writing to admin@drydredgers.org.