The family Aeolosomatidae was described as new in two occasions. It was originally described by Levinsen (1884: ... [details]
Since first described Longosomatidae (as Heterospio) were placed in the Spionida group. However, Wilson (2000: 193 ... [details]
Pholoidae forms a clade with Sigalionidae and is doubtfully distinct from Sigalionidae. Wiklund et al. (2005) ... [details]