"Kunz (1962) revised the Paramesochridae and introduced the new genera Scottopsyllus Kunz, 1962 and Intermedopsyllus Kunz, 1962. Later, Kunz (1981) combined the two genera and presented Scottopsyllus with three subgenera: Scottopsyllus, Intermedopsyllus and the newly established Wellsopsyllus Kunz, 1981. The genus group name Scottopsyllus as proposed by Kunz (1962), was declared as unavailable (nomen nudum) by Huys (2009) because he found ‘‘no trace of a type fixation in the original publication’’. Huys (2009) therefore replaced the name Scottopsyllus by the next oldest available name from among its synonyms, Wellsopsyllus Kunz, 1981. He found the same problem of lacking type fixation for the subgenus Intermedopsyllus. In the course of his nomenclatorical revision, Huys (2009) renamed the subgenera Scottopsyllus Apostolov and Marinov, 1988 and Intermediopsyllus Huys, 2009 (and introduced the new spelling Intermediopsyllus instead of Intermedopsyllus). At present, the genus Wellsopsyllus contains 15 species. The subgenus Wellsopsyllus Kunz, 1981 was conserved and contains 4 species to date, including the deep-sea species Wellsopsyllus (W.) abyssalis (Becker, 1979) and Wellsopsyllus (W.) antarcticus" (from: Kottmann et al., 2012)

"The genus Scottopsyllus has been the subject of several revisions (Kunz 1962, 1981) and assessments of its status within the family of Paramesochridae (Kunz 1981, Huys 1987). Its division into the three subgenera Scottopsyllus, Intermedopsyllus and Wellsopsyllus is based only on diagnostic characters and may not reflect a phylogenetic affinity. Many important characters are still not taken into account and surely a revision will have to include not only the genus Scottopsyllus, but the Paramesochridae as a whole" (from: Veit-Kohler, 2021)

The genus Tisbisoma occupies an uncertain position among harpacticoids (Bozic, 1964). Kunz (19819 and Huys (1987) allocated it to the family Paramesochridae and, together with the genus Diarthrodella, to the subfamily Diarthrodellinae.