Article: Tetrameric crinoid columnals from the Ordovician of Wales
Publication: Palaeontology
Volume:
26
Part:
4
Publication Date:
November
1983
Page(s):
845
–
849
Author(s):
S. K. Donovan
Abstract
Colpodecrinus forbesi sp. nov. is founded on the evidence of unusual tetrameric crinoid columnals similar to those of C. quadrifidus Sprinkle and Kolata. The columnals of C. forbesi have quadrangular lumina, either tetrastellate or square, whereas those of C. quadrifidus are tetralobate.