2022
DOI: 10.1017/jpa.2022.95
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Recovery of Laurentian cyclocystoids following Late Ordovician extinctions (Brassfield Formation, Llandovery; southwestern Ohio)

Abstract: Zygocycloides? foerstei n. sp. is described from the Llandovery (Aeronian) Brassfield Formation of southwestern Ohio. This is among the oldest reported Silurian cyclocystoids from North America and is the only North American Llandovery cyclocystoid that is preserved with a complete rim of marginal ossicles. Zygocycloides Smith and Paul, 1982 is most similar to Nicholsodiscus Glass et al., 2003 (Katian) and Perforocycloides Ewin et al., 2019 (Llandovery, Telychian), both from Anticosti Island, Québec. Cyclocyst… Show more

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“…These authors also provide a historical summary of early cyclocystoid investigations, including those by Salter and Billings (1858), Hall (1872), Bather (1900), Raymond (1913), Begg (1934Begg ( , 1939, Sieverts-Doreck (1951), Kesling (1963Kesling ( , 1966, and Nichols (1969Nichols ( , 1972. Subsequent investigations have focused largely on cyclocystoid occurrences and diversity of cyclocystoids (Berg-Madsen, 1987;Haude and Thomas, 1994;Smith and Wilson, 1995;Glass et al, 2003;Reich and Kutscher, 2010;Sprinkle et al, 2015;Reich et al, 2017;Ewin et al, 2019;Müller and Hahn, 2019;and Ausich and Zehler, 2022). Skeletal homologies, functional morphology, and life mode are poorly understood because cyclocystoids are rare as fossils and microscopic details of their skeletons generally are not well preserved.…”
Section: Introductionmentioning
confidence: 99%
“…These authors also provide a historical summary of early cyclocystoid investigations, including those by Salter and Billings (1858), Hall (1872), Bather (1900), Raymond (1913), Begg (1934Begg ( , 1939, Sieverts-Doreck (1951), Kesling (1963Kesling ( , 1966, and Nichols (1969Nichols ( , 1972. Subsequent investigations have focused largely on cyclocystoid occurrences and diversity of cyclocystoids (Berg-Madsen, 1987;Haude and Thomas, 1994;Smith and Wilson, 1995;Glass et al, 2003;Reich and Kutscher, 2010;Sprinkle et al, 2015;Reich et al, 2017;Ewin et al, 2019;Müller and Hahn, 2019;and Ausich and Zehler, 2022). Skeletal homologies, functional morphology, and life mode are poorly understood because cyclocystoids are rare as fossils and microscopic details of their skeletons generally are not well preserved.…”
Section: Introductionmentioning
confidence: 99%