Maricola is a suborder of triclad flatworms including species that mainly inhabit salt water environments.

[2] Two years later, in 1884, Hallez renamed these families as Otoplanidae, Procerodidae and Bdellouridae.

[3] In 1906 Böhmig classified the Maricola in two families and five subfamilies: Procerodidae (Euprocerodinae, Cercyrinae, Micropharynginae) and Bdellouridae (Uteriporinae, Eubdellourinae).

In 1909 Wilhelmi wrote a monograph on the group in which five families were described: Procerodidae, Uteriporidae, Cercyridae, Bdellouridae, Micropharyngidae.

[5] In 1989 Sluys recognized the six present families on the basis of phylogenetic analyses of the whole group.