''Racekiela ryderi'' is a

species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...

of freshwater

sponge Sponges, the members of the phylum Porifera (; meaning 'pore bearer'), are a basal animal clade as a sister of the diploblasts. They are multicellular organisms that have bodies full of pores and channels allowing water to circulate throug ...

in the

family Family (from la, familia) is a group of people related either by consanguinity (by recognized birth) or affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its members and of society. Idea ...

Spongillidae. It was first described by Edward Potts in 1882. It was collected on

Sable Island Sable Island (french: île de Sable, literally "island of sand") is a small Canadian island situated southeast of Halifax, Nova Scotia, and about southeast of the closest point of mainland Nova Scotia in the North Atlantic Ocean. The island ...

in 1899 by

John Macoun John Macoun (17 April 1831 – 18 June 1920) was an Irish-born Canadian naturalist. Early life Macoun was born in Magheralin, County Down, Ireland in 1831, the third child of James Macoun and Anne Jane Nevin. In 1850, the worsening ec ...

, a biologist with the

Geological Survey of Canada The Geological Survey of Canada (GSC; french: Commission géologique du Canada (CGC)) is a Canadian federal government agency responsible for performing geological surveys of the country, developing Canada's natural resources and protecting the e ...

, and given the name ''Heteromeyenia macouni'' by A.H. Mackay in 1900. It was originally assumed to be

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found else ...

to Sable Island but is now considered to be the same species as ''Racekiela ryderi'', which is more broadly distributed.

References

Spongillidae Sable Island Sponges described in 1882 {{Demosponge-stub