Morphological variability and paleoecology of the Late Ordovician Parastrophina from eastern Canada and the Tarim Basin, Northwest China

Sproat, Colin D.; Jin, Jisuo; Zhan, Renbin; Rudkin, David M.

doi:10.1016/j.palwor.2014.11.008

Cited by 9 publications

(7 citation statements)

References 33 publications

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“…Both formations are part of the middle Simcoe Group, which is equivalent to the Trenton and Ottawa groups (Armstrong, 2000). The Bobcaygeon and Verulam formations are currently considered Late Ordovician (late Sandbian–Katian) in age (Sproat et al, 2015), with the M4-M5 sequence boundary of eastern Laurentia occurring within the Bobcaygeon Formation (Holland and Patzkowsky, 1996). Because the fossiliferous horizons of the Bobcaygeon are largely restricted to the upper member of the formation, the crinoid material described here is Katian in age (Liberty, 1969; Brookfield and Brett, 1988).…”

Section: Stratigraphy and Geologic Settingmentioning

confidence: 99%

An echinoderm Lagerstätte from the Upper Ordovician (Katian), Ontario: taxonomic re-evaluation and description of new dicyclic camerate crinoids

Cole¹,

Ausich²,

Wright³

et al. 2018

J. Paleontol.

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The Upper Ordovician (lower Katian) Bobcaygeon and Verulam formations from the Lake Simcoe region of Ontario contain a highly diverse echinoderm assemblage that is herein recognized as a Konservat-Lagerstätte. Although fossil crinoids have long been recognized from these formations, the fauna has not received a comprehensive taxonomic evaluation since Springer’s classic 1911 monograph. Recent extensive collection and preparation of new material from the Bobcaygeon and Verulam formations near Brechin, Ontario recovered numerous exceptionally preserved crinoid specimens with arms, stems, and attachment structures intact. The Brechin Lagerstätte is the most taxonomically diverse Katian crinoid fauna, with more than 20 crinoid genera represented in this collection.Here, all dicyclic crinoids belonging to subclass Camerata from the Brechin Lagerstätte are evaluated. The following four genera and seven species are described from the fauna, including one new genus and four new species:Reteocrinus stellaris,Reteocrinus alveolatus,Archaeocrinus sundayaen. sp.,Archaeocrinus maraensisn. sp.,Priscillacrinus elegansn. gen. n. sp.,Cleiocrinus regius, andCleiocrinus lepidotusn. sp. The exceptional preservation of this collection provides an opportunity to describe more fully the morphologic and ontogenetic details of known Ordovician crinoid taxa, to conduct a taxonomic re-evaluation of many species, to describe new taxa, and to provide a framework for subsequent studies of crinoid community paleoecology.UUID:http://zoobank.org/e3e268a7-88e5-43cd-84ea-b40df45e8281

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Section: Stratigraphy and Geologic Settingmentioning

confidence: 99%

An echinoderm Lagerstätte from the Upper Ordovician (Katian), Ontario: taxonomic re-evaluation and description of new dicyclic camerate crinoids

Cole¹,

Ausich²,

Wright³

et al. 2018

J. Paleontol.

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“…The new crinoid specimens considered herein are from the Lake Simcoe region and the Bobcaygeon and Verulam formations, which are part of the middle portion of the Lake Simcoe Group (the Lake Simcoe Group is equivalent to the Trenton and Ottawa groups, see Armstrong, 2000). The middle and upper Bobcaygeon Formation and the lower Verulam Formation are Late Ordovician (Katian) in age (Brookfield and Brett, 1988; Holland and Patzkowsky, 1996; Sproat et al, 2015).…”

Section: Geologic Settingmentioning

confidence: 99%

Disparid and hybocrinid crinoids (Echinodermata) from the Upper Ordovician (lower Katian) Brechin Lagerstätte of Ontario

et al. 2018

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The Brechin Lagerstätte (Katian, Ordovician) from the Lake Simcoe region of Ontario, Canada contains a diverse array of echinoderms. Here, we describe seven disparid and two hybocrinid crinoids (subclass Pentacrinoidea, infraclass Inadunata), including a new disparid species belonging to the Anomalocrinidae (order Homocrinida). In total, the disparids include Anomalocrinus astrictus n. sp.; Cremacrinus guttenbergensis Kolata, 1975; C. inaequalis Billings, 1859; Daedalocrinus bellevillensis Billings, 1883; Eustenocrinus springeri Ulrich, 1925; Iocrinus trentonensis Walcott, 1883; and Isotomocrinus tenuis Billings, 1857b. The hybocrinids include Hybocrinus tumidus Billings, 1857a and Hybocystites problematicus Wetherby, 1880. Previously known from only the holotype, three additional specimens of E. springeri expand our understanding of this unusual crinoid. Nomenclatural acts include: (1) the recommended designation of D. kirki Ulrich, 1925 as a junior synonym of D. bellevillensis is followed; (2) Hybocrinus pristinus Billings, 1858 is designated as a junior synonym of H. tumidus, and previous decisions are followed to retain Hybocystites eldonensis (Parks, 1908) as a junior synonym of H. problematicus; (3) although probably assignable to Anomalocrinus Meek and Worthen, 1865, the aberrant crinoid Glaucocrinus falconeri Parks and Alcock, 1912, and its genus Glaucocrinus Parks and Alcock, 1912, are designated as nomena dubia; (4) Iocrinus similis (Billings, 1857) is also designated as a nomen dubium; and (5) Iocrinus subcrassus torontoensis Fritz, 1925 is designated a junior synonym of I. subcrassus Meek and Worthen, 1865.UUID: http://zoobank.org/90f8580b-ed7e-4405-97b2-73c9069de7f5

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“…Fossil horizons that make up the Brechin Lagerstätte span the lower portion of the Katian within the middle-upper Bobcaygeon and lower Verulam Formations. Although numerical ages for this interval are not tightly constrained, the Verulam-Bobcaygeon boundary should be approximately 451 Ma and the fauna should span an interval of roughly 2 million years or less (Sproat et al, 2015;Goldman et al, 2020). Thus, the estimated time between the latest fossiliferous horizons of the Bromide and the earliest fossiliferous horizons comprising the Brechin fauna is relatively short (~2 myr), and time elapsed between median ages for the faunas is <5 million years.…”

Section: Geology and Paleoenvironmental Settingmentioning

confidence: 99%

Niche evolution and phylogenetic community paleoecology of Late Ordovician crinoids

Cole¹,

Wright²

2021

Preprint

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Fossil crinoids are exceptionally suited to deep-time studies of community paleoecology and niche partitioning. By merging ecomorphological trait and phylogenetic data, this study summarizes niche occupation and community paleoecology of crinoids from the Bromide fauna of Oklahoma (Sandbian, Upper Ordovician). Further, patterns of community structure and niche evolution are evaluated over a ~5 million-year period through comparison with the Brechin Lagerstätte (Katian, Upper Ordovician). We establish filtration fan density, food size selectivity, and body size as major axes defining niche differentiation, and niche occupation is strongly controlled by phylogeny. Ecological strategies (i.e., adaptive zones) were relatively static over the study interval at high taxonomic scales, but niche differentiation and specialization increased in most subclades. Changes in disparity and species richness indicate the transition between the early-middle Paleozoic Crinoid Evolutionary Faunas was already underway by the Katian due to ecological drivers and was not triggered by the Late Ordovician mass extinction.

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Morphological variability and paleoecology of the Late Ordovician Parastrophina from eastern Canada and the Tarim Basin, Northwest China

Cited by 9 publications

References 33 publications

An echinoderm Lagerstätte from the Upper Ordovician (Katian), Ontario: taxonomic re-evaluation and description of new dicyclic camerate crinoids

An echinoderm Lagerstätte from the Upper Ordovician (Katian), Ontario: taxonomic re-evaluation and description of new dicyclic camerate crinoids

Disparid and hybocrinid crinoids (Echinodermata) from the Upper Ordovician (lower Katian) Brechin Lagerstätte of Ontario

Niche evolution and phylogenetic community paleoecology of Late Ordovician crinoids

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