Paracrinoidea is an extinct class of Crinozoan echinoderms closely related to, and superficially resembling sea lilies. They lived in shallow seas during the Early Ordovician through the Early Silurian. Paracrinoids are characterized by a mouth with two to five feeding arms arranged asymmetrically, or somewhat bisymmetrically. They have a U-shaped...
Found on
http://en.wikipedia.org/wiki/Paracrinoidea
(from the article `echinoderm`) ...stem, theca with 18–21 plates arranged in 4 rings; numerous feeding brachioles; distinctive infoldings of theca (hydrospires) well ...
Found on
http://www.britannica.com/eb/a-z/p/15
No exact match found.
