any member of an extinct group of marine organisms of uncertain relationships found as fossils in marine limestones of Late Precambrian and Early ... [2 related articles]
Found on
http://www.britannica.com/eb/a-z/a/95
one of the marine invertebrates of the extinct phylum Archaeocyatha, widely distributed during the Cambrian Period, having a limy, typically conical or cylindrical skeleton composed of sievelike inner and outer walls.
Found on
https://www.infoplease.com/dictionary/archaeocyathid
No exact match found.
