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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
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Rozhnov, S.V. 2009. Eocrinoids and paracrinoids of the Baltic
Ordovician basin: a biogeographical report. IGCP Meeting, Ordovician palaeogeography and palaeoclimate, Copenhagen, p. 16.
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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
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Pander, 1830 (Echinodermata; Ordovician), p. 179-180, in David, B., Guille, A., Féral, J.-P. & Roux, M. (eds.), Echinoderms through time (Balkema, Rotterdam).
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Kushlina, V.B. 1994. Interpretation of new data on
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Evolutionary palaeoecology of early epifaunal echinoderms
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group that may have been ancestral to six other classes:
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110:Eocrinoid holdfasts (Middle Ordovician, Utah)
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404:Cambrian explosion with Eocrinoid information
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294:. They may also be the progenitors of the
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302:. The earliest genera had a short
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628:Prehistoric echinoderm stubs
315:List of echinodermata orders
124:Colourful reconstruction of
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343:Barnes, Robert D. (1982).
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394:Palaeos on Eocrinoids
618:Silurian extinctions
608:Silurian echinoderms
603:Cambrian echinoderms
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253:Eocrinoidea
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176:Subphylum:
24:Eocrinoidea
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540:echinoderm
321:References
284:Blastoidea
280:Coronoidea
272:Rhombifera
222:Rhombifera
593:Blastozoa
243:Blastoids
183:Blastozoa
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150:Eukaryota
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407:Archived
304:holdfast
300:crinoids
296:cystoids
261:Cambrian
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160:Animalia
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445:Q149514
226:others?
217:Gogiida
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492:IRMNG
544:stub
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251:The
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