Crinoid Calyxes

Submitted by: Mike Topor
Taxon: Proctothylacocrinus berryorum
Submit date: 2007-03-05
Location (approximate): Arkona, Lambton, ON
Stratigraphy: Arkona Formation
Age: Erian (Middle Devonian)
Submitter notes: Three different specimens of Proctothylacocrinus berryorum: one showing a portion of the anal sac and another with a partial stem are included in the photo. This species occurs in the upper Arkona fm. Very rare! See scale in photo for size.

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