Family Orbiniidae Hartman, 1942

Type genus: Orbinia Quatrefages, 1866, designated by Hartman, 1942.

Remarks. The family as defined by Blake (2017) largely follows that of Hartman (1957). There are approximately 20 genera of Orbiniidae, some of which are rare or poorly known (Blake 2017; Bleidorn & Helm 2019). Of these, only seven genera contain species from depths exceeding 2000 m: Berkeleyia, Califia, Leitoscoloplos, Microrbinia, Orbiniella, Phylo, and Scoloplos . Most species of Berkeleyia, Microrbinia, and Califia are from deep-water habitats, whereas Leitoscoloplos, Orbiniella, Phylo, and Scoloplos contain species from all depths.