Noun
A hard chitinous or calcareous process or corpuscle, especially a spicule of the Alcyonaria.
Source: Webster's dictionarySince 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