Samiksha Jaiswal (Editor)

Eocrinoidea

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Kingdom
  
Scientific name
  
Eocrinoidea

Higher classification
  
Blastozoa

Subphylum
  
Blastozoa

Phylum
  
Rank
  
Class

Eocrinoidea Gogia Eocrinoid Fossil

Similar
  
Echinoderm, Gogia, Edrioasteroidea, Cystoidea, Blastozoa

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.

Eocrinoidea Gogia spiralis Eocrinoid Fossil

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. See also List of echinodermata orders.

Eocrinoidea wwwucmpberkeleyeduechinodermatagogiajpg
Eocrinoidea Virtual museum Eocrinoidea Eocrinoids

Eocrinoidea Virtual museum Eocrinoidea Eocrinoids

References

Eocrinoidea Wikipedia