Cryptoblastus

Cryptoblastus; Temporal range: Mississippian PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Echinodermata
Subphylum:	†Blastozoa
Class:	† Blastoidea
Order:	†Spiraculata
Genus:	†Cryptoblastus; Etherridge, Jr. & Carpender, 1886

Cryptoblastus is a genus of extinct blastoids, a primitive group of echinoderms related to the modern sea lilies.[1] Fossils are found in sedimentary rocks laid down in the Early Carboniferous period some 360 to 320 million years ago. [2]

References

"Blastoid Association Plate from Burlington Formation". The Virtual Fossil Museum: Fossils Across Geological Time and Evolution. Retrieved June 27, 2009.
Cryptoblastus. (2011). In Encyclopædia Britannica. Retrieved from http://www.britannica.com/EBchecked/topic/145001/Cryptoblastus

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[1] "Blastoid Association Plate from Burlington Formation". The Virtual Fossil Museum: Fossils Across Geological Time and Evolution. Retrieved June 27, 2009.

[2] Cryptoblastus. (2011). In Encyclopædia Britannica. Retrieved from http://www.britannica.com/EBchecked/topic/145001/Cryptoblastus