The stylophorans are an extinct, possibly polyphyletic group allied to the echinoderms, comprising the cornutes and mitrates. It is synonymous with the subphylum Calcichordata. The general stylophoran body plan consists of a flattened theca and a single jointed appendage which extends from it. Stylophoran tests are composed of stereom calcite plat...
Found on
http://en.wikipedia.org/wiki/Stylophora
(from the article `echinoderm`) ...Cambrian to Middle Devonian about 365,000,000–570,000,000 years ago; without 5-part symmetry; with fundamentally asymmetrical flattened ...
Found on
http://www.britannica.com/eb/a-z/s/176
No exact match found.
