Noun
halkieriid (plural halkieriids)
(zoology) Any member of the Halkieriidae.
Since the 1990s archaeocyathids have been regarded as a distinctive group of sponges. citation Halkieriid sclerite structure Halkieriid sclerite structure It is difficult to fit chancelloriids into classifications of sponges or more complex animals. Source: Internet