Evolution and Classification of Paleozoic Crinoids

Moore, Raymond C.; Laudon, Lowell Robert

doi:10.1130/spe46-p1

Cited by 236 publications

(219 citation statements)

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“…Testing whether the other cyathocrine cladids belong to this clade remains an open question and requires sampling younger species. Similarly, Ordovician cladids placed within the Dendrocrinida (sensu Moore and Laudon, 1943) are paraphyletic, but there may nevertheless be latent phylogenetic structure present among subsets of post-Ordovician dendrocrines that could inform taxonomic revisions.…”

Section: Previous Work On Crinoid Phylogenymentioning

confidence: 99%

“…Indeed, the Cladida (sensu Moore and Laudon, 1943) have long been considered a paraphyletic group because some nominal cladids are hypothesized to be more closely related to flexible and/or articulate crinoids than other cladids (Springer, 1920;Simms and Sevastopulo, 1993;Brower, 1995;Ausich, 1998;Wright, 2015). Unfortunately, recent phylogenetic analyses not only confirm that Ordovician cladids are a paraphyletic assemblage (Guensburg, 2012;Ausich et al, 2015), but also that the validity of the Cladida and their constituent higher taxa (i.e., Dendrocrinida and Cyathocrinida) cannot be fully remedied by simply adopting Simms and Sevastopulo's (1993) recommendation to place the Flexibilia and Articulata within the Cladida.…”

Section: Previous Work On Crinoid Phylogenymentioning

confidence: 99%

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Bayesian estimation of fossil phylogenies and the evolution of early to middle Paleozoic crinoids (Echinodermata)

Wright¹

2017

J. Paleontol.

137

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Abstract.-Knowledge of phylogenetic relationships among species is fundamental to understanding basic patterns in evolution and underpins nearly all research programs in biology and paleontology. However, most methods of phylogenetic inference typically used by paleontologists do not accommodate the idiosyncrasies of fossil data and therefore do not take full advantage of the information provided by the fossil record. The advent of Bayesian 'tip-dating' approaches to phylogeny estimation is especially promising for paleosystematists because time-stamped comparative data can be combined with probabilistic models tailored to accommodate the study of fossil taxa. Under a Bayesian framework, the recently developed fossilized birth-death (FBD) process provides a more realistic tree prior model for paleontological data that accounts for macroevolutionary dynamics, preservation, and sampling when inferring phylogenetic trees containing fossils. In addition, the FBD tree prior allows for the possibility of sampling ancestral morphotaxa. Although paleontologists are increasingly embracing probabilistic phylogenetic methods, these recent developments have not previously been applied to the deep-time invertebrate fossil record. Here, I examine phylogenetic relationships among Ordovician through Devonian crinoids using a Bayesian tip-dating approach. Results support several clades recognized in previous analyses sampling only Ordovician taxa, but also reveal instances where phylogenetic affinities are more complex and extensive revisions are necessary, particularly among the Cladida. The name Porocrinoidea is proposed for a well-supported clade of Ordovician 'cyathocrine' cladids and hybocrinids. The Eucladida is proposed as a clade name for the sister group of the Flexibilia herein comprised of cladids variously considered 'cyathocrines,' 'dendrocrines,' and/or 'poteriocrines' by other authors.

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Section: Previous Work On Crinoid Phylogenymentioning

confidence: 99%

Section: Previous Work On Crinoid Phylogenymentioning

confidence: 99%

Bayesian estimation of fossil phylogenies and the evolution of early to middle Paleozoic crinoids (Echinodermata)

Wright¹

2017

J. Paleontol.

137

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“…Subclass Disparida Moore and Laudon, 1943 Order Maennilicrinida Ausich, 1998bFamily Maennilicrinidae Ausich, 1998bGenus Heviacrinus Gil Cid, Domínguez Alonso, and Silván Pobes, 1996 Type species.-Heviacrinus melendezi Gil Cid, Domínguez Alonso, and Silván Pobes, 1996; by monotypy. Remarks.-A single specimen of Heviacrinus is reported from the Castillejo Formation (Darriwilian) of northern Spain.…”

Section: Ambonacrinus Decorus New Speciesmentioning

confidence: 99%

“…Order Monobathrida Moore and Laudon, 1943 Suborder Glyptocrinina Moore, 1952Superfamily Patelliocrinoidea Angelin, 1878 Family Patelliocrinidae Angelin, 1878Genus Eopatelliocrinus Brower, 1973 Type species.-Eopatelliocrinus scyphogracilis Brower, 1973; by original designation.…”

Section: Ambonacrinus Decorus New Speciesmentioning

confidence: 99%

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Filling the Gondwanan gap: paleobiogeographic implications of new crinoids from the Castillejo and Fombuena formations (Middle and Upper Ordovician, Iberian Chains, Spain)

Cole¹,

Ausich²,

Colmenar³

et al. 2017

J. Paleontol.

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Abstract.-A diverse crinoid fauna is described from the Upper Ordovician (Katian) Fombuena Formation from the eastern Iberian Chains of Spain. New crinoids include the diplobathrid camerates Fombuenacrinus nodulus n. gen. n. sp., Goyacrinus gutierrezi n. gen. n. sp., Dalicrinus hammanni n. gen. n. sp., and Ambonacrinus decorus n. gen. n. sp.; the monobathrid camerate Eopatelliocrinus hispaniensis n. sp.; and the cladid Picassocrinus villasi n. gen. n. sp. A new occurrence of Heviacrinus melendezi Gil Cid, Domínguez Alonso, and Silván Pobes, 1996 is also documented from the Castillejo Formation (Darriwilian, Middle Ordovician) from the eastern Iberian Chains of Spain. The Fombuena Formation comprises a Gondwanan crinoid assemblage from a high paleolatitude and has the highest crinoid diversity of any currently known Katian Gondwanan fauna. This assemblage is compared to other Katian age faunas around the globe, and its paleobiogeographic implications are discussed.

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Upper Llandovery (Telychian) crinoids (Echinodermata) of Devil's Dingle, Buildwas, Shropshire

Donovan

Lewis

2005

Geological Journal

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Two crinoids with strong North American affinities are described from the Telychian (Upper Llandovery, Lower Silurian) of Devil's Dingle, near Buildwas, Shropshire. The disparid Myelodactylus convolutus Hall is easily differentiated from other members of this genus from the Silurian of the British Isles by its distinctive stem geometry. This species was hitherto only known with certainty from North America, although an unsubstantiated report had identified it previously from the Much Wenlock Limestone Formation. The sagenocrinid flexible Clidochirus? sp. is tentatively assigned to a genus originally identified from Gotland, but best known from North America. The specimen from Devil's Dingle is probably a new species, with arms branching only twice and a distinctive sculpture to the tertibrachials, but only one side of the crown is exposed. Copyright © 2005 John Wiley & Sons, Ltd.

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Evolution and Classification of Paleozoic Crinoids

Cited by 236 publications

References 0 publications

Bayesian estimation of fossil phylogenies and the evolution of early to middle Paleozoic crinoids (Echinodermata)

Bayesian estimation of fossil phylogenies and the evolution of early to middle Paleozoic crinoids (Echinodermata)

Filling the Gondwanan gap: paleobiogeographic implications of new crinoids from the Castillejo and Fombuena formations (Middle and Upper Ordovician, Iberian Chains, Spain)

Upper Llandovery (Telychian) crinoids (Echinodermata) of Devil's Dingle, Buildwas, Shropshire

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