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Phylogeny and morphologic evolution of the Ordovician Camerata (Class Crinoidea, Phylum Echinodermata)

  • Selina R. Cole (a1)

The subclass Camerata (Crinoidea, Echinodermata) is a major group of Paleozoic crinoids that represents an early divergence in the evolutionary history and morphologic diversification of class Crinoidea, yet phylogenetic relationships among early camerates remain unresolved. This study conducted a series of quantitative phylogenetic analyses using parsimony methods to infer relationships of all well-preserved Ordovician camerate genera (52 taxa), establish the branching sequence of early camerates, and test the monophyly of traditionally recognized higher taxa, including orders Monobathrida and Diplobathrida. The first phylogenetic analysis identified a suitable outroup for rooting the Ordovician camerate tree and assessed affinities of the atypical dicyclic family Reteocrinidae. The second analysis inferred the phylogeny of all well-preserved Ordovician camerate genera. Inferred phylogenies confirm: (1) the Tremadocian genera Cnemecrinus and Eknomocrinus are sister to the Camerata; (2) as historically defined, orders Monobathrida and Diplobathrida do not represent monophyletic groups; (3) with minimal revision, Monobathrida and Diplobathrida can be re-diagnosed to represent monophyletic clades; (4) family Reteocrinidae is more closely related to camerates than to other crinoid groups currently recognized at the subclass level; and (5) several genera in subclass Camerata represent stem taxa that cannot be classified as either true monobathrids or true diplobathrids. The clade containing Monobathrida and Diplobathrida, as recognized herein, is termed Eucamerata to distinguish its constituent taxa from more basally positioned taxa, termed stem eucamerates. The results of this study provide a phylogenetic framework for revising camerate classification, elucidating patterns of morphologic evolution, and informing outgroup selection for future phylogenetic analyses of post-Ordovician camerates.

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W.I. Ausich , 1986, Early Silurian rhodocrinitacean crinoids (Brassfield Formation, Ohio): Journal of Paleontology, v. 60, p. 84106.

W.I. Ausich , 1996, Crinoid plate circlet homologies: Journal of Paleontology, v. 70, p. 955964.

W.I. Ausich , 1998a, Early phylogeny and subclass division of the Crinoidea (Phylum Echinodermata): Journal of Paleontology, v. 72, p. 499510.

W.I. Ausich , T.W. Kammer , and T.K. Baumiller , 1994, Demise of the middle Paleozoic crinoid fauna: A single extinction event or rapid faunal turnover?: Paleobiology, v. 20, p. 345361.

W.I. Ausich , T.E. Bolton , and L.M. Cummings , 1998, Whiterockian (Ordovician) crinoid fauna from the Table Head Group, western Newfoundland, Canada: Canadian Journal of Earth Science, v. 35, p. 121130.

W.I. Ausich , M.D. Gil Cid , and P.D. Alonso , 2002, Ordovician [Dobrotivian (Llandeillian Stage) to Ashgill] crinoids (Phylum Echinodermata) from the Montes de Toledo and Sierra Morena, Spain with implications for paleogeography of peri-Gondwana: Journal of Paleontology, v. 76, p. 975992.

W.I. Ausich , A.A. , and J. Gutiérrez-Marco , 2007, New and revised occurrences of Ordovician crinoids from southwestern Europe: Journal of Paleontology, v. 81, p. 13741383.

W.I. Ausich , T.W. Kammer , E.C. Rhenberg , and D.F. Wright , 2015, Early phylogeny of crinoids within the pelmatozoan clade: Palaeontology, v. 58, p. 937952.

R.S. Bassler , 1943, New Ordovician cystidean echinoderms from Olkahoma: American Journal of Science, v. 241, p. 694703.

M.A. Bell , and G.T. Lloyd , 2015, strap: An R package for plotting phylogenies against stratigraphy and assessing their stratigraphic congruence: Palaeontology, v. 58, p. 379389.

M.J. Benton , and G.W. Storrs , 1994, Testing the quality of the fossil record: Paleontological knowledge is improving: Geology, v. 22, p. 111114.

J.F. Bockelie , 1981, Functional morphology and evolution of the cystoid Echinosphaerites : Lethaia, v. 14, p. 189202.

J.P. Botting , 2003, Llanvirn (Middle Ordovician) echinoderms from Llandegley Rocks, central Wales: Palaeontology, v. 46, p. 685708.

J.C. Brower , 1994, Camerate crinoids from the Middle Ordovician (Galena Group, Dunleith Formation) of northern Iowa and southern Minnesota: Journal of Paleontology, v. 68, p. 570599.

S.J. Carlson , 2001, Ghosts of the past, present, and future in brachiopod systematics: Journal of Paleontology, v. 75, p. 11091118.

S.R. Cole , W.I. Ausich , J. Colmenar , and S. Zamora , 2017, Filling the Gondwanan gap: Diverse crinoids from the Castillejo and Fombuena formations (Middle and Upper Ordovician, Iberian Chains, Spain): Journal of Paleontology, doi: 10.1017/jpa.2016.135.

S.K. Donovan , and N. Gilmour , 2003, New camerate crinoids from the Ordovician of Scotland and Wales: Transactions of the Royal Society of Edinburgh: Earth Sciences, v. 93, p. 155161.

J.D. Eckert , 1988, Late Ordovician extinction of North American and British crinoids: Lethaia, v. 21, p. 147167.

J.S. Farris , 1989, The retention index and rescaled consistency index: Cladistics, v. 5, p. 417419.

M. Foote , 1994, Morphological disparity in Ordovician–Devonian crinoids and the early saturation of morphological space: Paleobiology, v. 20, p. 320344.

M. Foote , 1997, Estimating taxonomic durations and preservation probability: Paleobiology, v. 23, p. 278300.

M. Foote , 1999, Morphological diversity in the evolutionary radiation of Paleozoic and post-Paleozoic crinoids: Paleobiology, v. 25, p. 1115.

M. Foote , and D.M. Raup , 1996, Fossil preservation and the stratigraphic ranges of taxa: Paleobiology, v. 22, p. 121140.

D. Gil , P. Domínguez , M. Torres , and I. Jiménez , 1999, A mathematical tool to analyze radially symmetrical organisms and its application to a new camerate from Upper Ordovician of south western Spain: Geobios, v. 32, p. 861867.

T.E. Guensburg , 2012, Phylogenetic implications of the oldest crinoids: Journal of Paleontology, v. 86, p. 455461.

T.E. Guensburg , and J. Sprinkle , 2009, Solving the mystery of crinoid ancestry: New fossil evidence of arm origin and development: Journal of Paleontology, v. 83, p. 350364.

T.E. Guensburg , and B.G. Waisfeld , 2015, South America’s earliest (Ordovician, Floian) crinoids: Journal of Paleontology, v. 89, p. 622630.

J.P. Huelsenbeck , 1994, Comparing the stratigraphic record to estimates of phylogeny: Paleobiology, v. 20, p. 470483.

T.W. Kammer , C.D. Sumrall , S. Zamora , W.I. Ausich , and B. Deline , 2013, Oral region homologies in Paleozoic crinoids and other plesiomorphic pentaradial echinoderms: PLoS ONE, v. 8, 16 p. doi: 10.1371/journal.pone.0077989.

P.H. Kelley , D.E. Fastovsky , M.A. Wilson , R.A. Laws , and A. Raymond , 2013, From paleontology to paleobiology: A half-century of progress in understanding life history: Geological Society of America Special Papers, v. 500, p. 191232.

J. Le Menn , and N. Spjeldnaes , 1996, Un nouveau crinoïde Dimerocrinitidae (Camerata, Diplobathrida) de l’Ordovicien supérieur du Maroc: Rosfacrinus robustus nov. gen., nov. sp.: Geobios, v. 29, p. 341351.

R.C. Moore , and L.R. Laudon , 1943a, Evolution and classification of Paleozoic crinoids: Geological Society of America Special Paper, v. 46, p. 1154.

R.C. Moore , and L.R. Laudon , 1943b, Trichinocrinus, a new camerate crinoid from Lower Ordovician (Canadian?) rocks of Newfoundland: American Journal of Science, v. 241, p. 262268.

C.E. O’Malley , W.I. Ausich , and Y. Chin , 2016, Deep echinoderm phylogeny preserved in organic molecules from Paleozoic fossils: Geology, v. 44, p. 379382.

D. Pol , and M.A. Norell , 2001, Comments on the Manhattan stratigraphic measure: Cladistics, v. 17, p. 285289.

E.C. Rhenberg , W.I. Ausich , and T.W. Kammer , 2015, Generic concepts in the Actinocrinitidae Austin and Austin, 1842 (class Crinoidea) and evaluation of generic assignments of species: Journal of Paleontology, v. 89, p. 119.

L. Shavit , D. Penny , M.D. Hendy , and B.R. Holland , 2007, The problem of rooting rapid radiations: Molecular Biology and Evolution, v. 24, p. 24002411.

M.E. Siddall , 1998, Stratigraphic fit to phylogenetics: A proposed solution: Cladistics, v. 14, p. 201208.

M.J Simms , 1993, Reinterpretation of thecal plate homology and phylogeny in the Class Crinoidea: Lethaia, v. 26, p. 303312.

A.B. Smith , 1994a, Rooting molecular trees: Problems and strategies: Biological Journal of the Linnaean Society, v. 51, p. 279292.

A.B. Smith , and S. Zamora , 2009, Rooting phylogenies of problematic fossil taxa; a case study using cinctans (stem-group echinoderms): Palaeontology, v. 52, p. 803821.

A.B. Smith , B. Lafay , and R. Christen , 1992, Comparative variation of morphological and molecular evolution through geologic time: 28S ribosomal RNA versus morphology in echinoids: Philosophical Transactions: Biological Sciences, v. 338, p. 365382.

J. Sprinkle , and G.P. Wahlman , 1994, New echinoderms from the Early Ordovician of west Texas: Journal of Paleontology, v. 68, p. 324338.

G.D. Webster , and C.G. Maples , 2006, Cladid crinoid (Echinodermata) anal conditions: A terminology problem and a proposed solution: Palaeontology, v. 49, p. 187212.

W.C. Wheeler , 1990, Nucleic acid sequence phylogeny and random outgroups: Cladistics, v. 6, p. 363368.

D.F. Wright , 2015, Fossils, homology, and “Phylogenetic Paleo-ontogeny”: A reassessment of primary posterior plate homologies among fossil and living crinoids with insight from developmental biology: Paleobiology, v. 41, p. 570591.

D.F. Wright , 2017, Bayesian estimation of fossil phylogenies and the evolution of early to middle Paleozoic crinoids (Echinodermata): Journal of Paleontology, doi: 10.1017/jpa.2016.141.

D.F. Wright , W.I. Ausich , S.R. Cole , E.C. Rhenberg , and M.E. Peter , 2017, Phylogenetic taxonomy and classification of the Crinoidea (Echinodermata): Journal of Paleontology, doi: 10.1017/jpa.2016.142.

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Journal of Paleontology
  • ISSN: 0022-3360
  • EISSN: 1937-2337
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