Eocrinoidea

Eocrinoidea Temporal range:
	Eocrinoid holdfasts (Middle Ordovician, Utah)
	Colourful reconstruction of Gogia ojenai
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Echinodermata
Subphylum:	†Blastozoa
Class:	†Eocrinoidea; Jaekel, 1899
Groups included
	†Ascocystitida †Ascocystitidae; †Cambrocystidae; †Rhopalocystidae; ; †Gogiida †Eocrinidae; †Lyracystidae; ; †Trachelocrinida †Heckerocrinidae; †Trachelocrinidae; ; †Cryptocrinitidae; †Felbabkacystidae; †Lepidocystoidae; †Lichenoididae; †Lingulocystidae; †Palaeocystitidae; †Rhipidocystidae; †Ridersiidae;
Cladistically included but traditionally excluded taxa
	†Rhombifera; †Diploporita; †Paracrinoidea; †Parablastoidea; †Blastoidea; †Coronoidea; Crinoidea ?;

The Eocrinoidea were an extinct class of echinoderms that lived between the Early Cambrian and Late Silurian periods. They are the earliest known group of stalked, brachiole-bearing echinoderms, and were the most common echinoderms during the Cambrian.

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.

Eocrinoidea Temporal range:

Eocrinoid holdfasts (Middle Ordovician, Utah)

Colourful reconstruction of Gogia ojenai
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Echinodermata
Subphylum:	†Blastozoa
Class:	†Eocrinoidea Jaekel, 1899
Groups included
†Ascocystitida †Ascocystitidae †Cambrocystidae †Rhopalocystidae †Gogiida †Eocrinidae †Lyracystidae †Trachelocrinida †Heckerocrinidae †Trachelocrinidae †Cryptocrinitidae †Felbabkacystidae †Lepidocystoidae †Lichenoididae †Lingulocystidae †Palaeocystitidae †Rhipidocystidae †Ridersiidae
Cladistically included but traditionally excluded taxa
†Rhombifera †Diploporita †Paracrinoidea †Parablastoidea †Blastoidea †Coronoidea Crinoidea ?