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Echinosphaerites Temporal range: Early - Middle Ordovician
Echinosphaerites aurantium from the Middle Ordovician of Estonia.
Scientific classification
Kingdom:	Animalia
Phylum:	Echinodermata
Class:	Rhombifera
Genus:	Echinosphaerites

Echinosphaerites is a genus of rhombiferan cystoid echinoderms that lived in the Early to Middle Ordovician of North America and Europe (Bockelie, 1981).

Contents

• Biology
• References
• External links

Biology

Echinosphaerites had branched biserial brachioles which is rare for species belonging to the Class Rhombifera. Echinosphaerites had a skeletal meshwork like many other blastozoan echinoderms, with a fine outer mesh layer and an inner coarse mesh layer. During evolution the number and location of these brachioles, including the branching patterns, increased in the number of brachioles and complexity of the branching pattern. The exothecal pore structures increased in the complexity of patterns of tangential canals (Bockelie, 1981).

References

• Bockelie, J.F., 1981. Functional morphology and evolution of the cystoid Echinosphaerites. Lethaia 14: 189–202.

External links

• Echinosphaerites in the Paleobiology Database
• Functional morphology and evolution of the cystoid Echinosphaerites in the Wiley Online Library

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