Eocrinoidea (Eocrinoids)

The Eocrinoidea are an extinct class of echinoderms that lived between the Early Cambrian and Late Silurian periods. They are the earliest known group of stalked, arm-bearing echinoderms, and were the most common echinoderms during the Cambrian.The eocrinoids were a paraphyletic group that may have been ancestral to six other classes: Rhombifera, Diploporita, Coronoidea, Blastoidea, Parablastoidea, and Paracrinoidea. The earliest genera had a short holdfast and irregularly structured plates. Later forms had a fully developed stalk with regular rows of plates. They were benthic suspension feeders, with five ambulacra on the upper surface, surrounding the mouth and extending into a number of narrow arms. An unusual Ordovician form was the conical Bolboporites with its single brachiole.

Source: http://en.wikipedia.org/wiki/Eocrinoidea

Etoctenocystis bohemicus		CW84
Etoctenocystis bohemicus		CW85
Etoctenocystis bohemicus		VL1673
Etoctenocystis bohemicus	AD, Fatka a Kordule (1985)	VK359
Etoctenocystis bohemicus		CW41
Etoctenocystis bohemicus		CW534
Etoctenocystis bohemicus	Fatka a Kordule (1985), Pl. 2	VK358
Etoctenocystis bohemicus		CW533
Etoctenocystis		CW739
Etoctenocystis		CW1195
Etoctenocystis		CW82
Etoctenocystis		OZ132
Felbabkacystis lucka	Nardin et al. (2017)Fig. 4(2),	SZ347
Felbabkacystis lucka	AD, Nardin et al. (2017)	SZ344
Felbabkacystis lucka	AD, Nardin et al. (2017)	SZ345
Felbabkacystis lucka	Nardin et al. (2017)Fig. 4(3),	SZ346
Felbabkacystis lucka	Nardin et al. (2017)Fig. 3(2), 5(2)	SZ349
Felbabkacystis lucka	Nardin et al. (2017)Fig. 3(1), 4(1), 5(1)	SZ343
Felbabkacystis lucka	AD, Nardin et al. (2017): Journal of Paleontology 91(4):672-684; Fig. 3(3),	SZ348
Felbabkacystis lucka	Nardin et al. (2017)Fig. 4(4)	LK1

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Img. 88:

Morphology of eocrinoids

On-line reference: http://cs.wikipedia.org

Virtual museum of the Czech Geological Survey, www.geology.cz, (C) Czech Geological Survey, 2011, v.0.99 [13.12.2011]