Phascolosomatidea is a class of peanut worms containing two orders: \n* Aspidosiphoniformes \n* Phascolosomatiformes Their hooks are arranged in regular rings.
Species taxanomy provided by GBIF Secretariat (2022). GBIF Backbone Taxonomy. Checklist dataset https://doi.org/10.15468/39omei accessed via GBIF.org on 2023-06-13; License: CC BY 4.0