Sporolithaceae
Encyclopedia
The Sporolithaceae are one of the two extant families
Family (biology)
In biological classification, family is* a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, class, order, genus, and species, with family fitting between order and genus. As for the other well-known ranks, there is the option of an immediately lower rank, indicated by the...

 of coralline algae
Coralline algae
Coralline algae are red algae in the order Corallinales. They are characterized by a thallus that is hard because of calcareous deposits contained within the cell walls...

 (algae in the order Corallinales). They are differentiated from the other family, the Corallinaceae
Corallinaceae
The Corallinaceae are one of the two extant Coralline families of red algae; they are differentiated from the morphologically similar Sporolithaceae by their formation of grouped sporangial chambers, clustered into sori...

, by their formation of conceptacles with one or many pores.

The morphologically-indeterminable graticulaceae date to the Wenlock (Silurian).
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