Onslowiaceae is the only

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 ...

in order Onslowiales in the

brown algae Brown algae (singular: alga), comprising the class Phaeophyceae, are a large group of multicellular algae, including many seaweeds located in colder waters within the Northern Hemisphere. Brown algae are the major seaweeds of the temperate and p ...

(class Phaeophyceae). The family contains only the genera '' Onslowia'' and '' Verosphacela''.

References

Brown algae families Brown algae {{Phaeophyceae-stub