The Contribution of Crinoids to Early Paleozoic Echinoderm Morphologic Diversity

Lester, Rachel; Hanson, Kathryn E.; Deline, Bradley

doi:10.1130/abs/2017am-301450

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“…As noted in the preceding (Ubaghs, 1978; Thomka et al, 2012), cladid crinoids are less likely to be fossilized due to their weak suturing, but Erisocrinus has a significantly higher preservation potential compared with other cladid crinoids. This is shown in studies performed at the genus level using bulk samples of the Wann and the Barnsdall formations (Lewis, 1986; Thomka, 2010). Higher preservation potential, combined with ideal preservation conditions, has yielded a series of 10 crowns belonging to Erisocrinus recovered from the Barnsdall Formation (Oklahoma, USA), which provides insight into the ontogeny of late Paleozoic crinoids that are rarely found in high enough numbers to study in such detail.…”

Section: Introductionmentioning

confidence: 81%

Examining the ontogeny of the Pennsylvanian cladid crinoid Erisocrinus typus Meek and Worthen, 1865

et al. 2023

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Non-technical Summary Crinoids, the group known today as the sea lilies, were a major constituent of ocean environments from the late Carboniferous (323–299 million years ago). However, crinoid fossil-forming potential is poor, and they typically fell apart quickly after death. This limits our ability to study much about their life histories, including how they would have grown. Through the discovery of an area of exceptional fossil preservation in the Barnsdall Formation of Oklahoma, we have a rare chance to learn about the growth of one of these species of crinoids, Erisocrinus typus. Here we perform a growth analysis of a well-preserved series of fossils and discuss the patterns that it showed from its juvenile stage to adulthood.

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Section: Introductionmentioning

confidence: 81%