Friends of the UMMP Michigan Basin Specimen Database

Crinoid calyx

Submitted by: Joseph Koniecki
Taxon: Dolatocrinus stellifer
Submit date: 2012-01-11
Location (approximate): Alpena, Alpena, MI
Stratigraphy: Four Mile Dam Formation
Age: Erian (Middle Devonian)
Submitter notes: The picture is a view of cup and tegmen of the same specimen. The calyx is 3.5 cm across.

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Comments:

Mike PalescukJanuary 23, 2015 at 8:32 AM

This is actually D. costatus (1904 per Elvira Wood: 4 arms per ray = 20 arms) (also per Springer, p. 48, 20 arms). D. stellifer has 11 arms (Miller & Gurley) to 15 arms (Springer 1921, p.44).

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