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Pleurocystites ? scylla , a new species of pleurocystitid rhombiferan, and comments on early echinoderm teratologies
Ancient deep ocean as a harbor of biotic innovation revealed by Carboniferous ophiuroid microfossils
Presentation of the 2021 Harrell L. Strimple Award of the Paleontological Society to Daniel Phelps
New Upper Ordovician edrioasteroids from Morocco
Abstract Edrioasteroids from the Katian, Lower Ktaoua and Upper Tiouririne formations provide new data on several previously described species and two new species of edrioasteroids. Ontogenetic and palaeoecological data are provided for Moroccopyrgus matacarros . Well-preserved oral areas and internal views of the oral frame show Euryeschatia reboulorum to be an unusual lebetodiscinid rather than an isorophinid. The pyrgocystid Spinadiscus lefebvrei n. gen. and sp. and the highly inflated isorophinid Panidiscus tamiformis n. gen. and sp. are described. Specimens of Moroccopyrgus matacarros and Euryeschatia reboulorum are only found attached to echinosphaeritid rhombiferans and conulariids, respectively, suggesting commensal relationships. Other species attach to a variety of different surfaces.
Abstract Hexedriocystis is a very unusual echinoderm with a puzzling combination of morphological features. The two described species H. inexpectatus and H. mimus occur in Upper Ordovician siliciclastic rocks from Morocco, North Africa. They show a striking combination of isorophid edrioasteroid, paedomorphic crinoid and blastozoan characteristics including a domed thecal shape with a peripheral rim-like attachment structure, imbricate thecal plates. However, both species developed feeding appendages covered by large peristomial cover plates and six oral plates. Hexedriocystis lived intimately associated with edrioasteroid colonies and its strange morphology is probably the result of convergence with isorophid edrioasteroid.