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Syzygial brachials from the upper Muschelkalk (Middle Triassic, Ladinian) of Poland and their implication for an early origin of comatulid crinoids

Published online by Cambridge University Press:  20 May 2016

Mariusz A. Salamon ,
Michat Zatoń  and
Przemysław Gorzelak
Mariusz A. Salamon
Affiliation:
University of Silesia, Faculty of Earth Sciences, Bldzińska Street 60, Pl-41-200 Sosnowiec, Poland,
Michat Zatoń
Affiliation:
University of Silesia, Faculty of Earth Sciences, Bldzińska Street 60, Pl-41-200 Sosnowiec, Poland,
Przemysław Gorzelak
Affiliation:
University of Silesia, Faculty of Earth Sciences, Bldzińska Street 60, Pl-41-200 Sosnowiec, Poland,
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Extract

According to Ubaghs (1978), syzygies are brachial articulations in which radiating ridges and furrows on the two joint faces oppose each other rather than interlock as in symplexies. Cryptosyzygies differ from syzygies by having very short ridges that may be replaced by rows of tubercles or granules, with a tendency toward irregular arrangement and disappearance. Among Triassic crinoids, only representatives of the orders Isocrinida Sieverts-Doreck, 1952 and Comatulida Clark, 1908 had cryptosyzygial or syzygial brachial articulation, respectively. According to Rasmussen (1978), among Isocrinidae the articulations of primibrachial 1 and 2 and secundibrachial 1 and 2 were cryptosyzygial or synarthrial (but see also comments in Simms, 1988a). Among Comatulida, syzygial articulations generally occur between brachials 3 and 4 and in more distal arm parts.

Type
Paleontological Notes
Information
Journal of Paleontology , Volume 82 , Issue 3 , May 2008 , pp. 634 - 637
Copyright
Copyright © The Paleontological Society 

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