Phascolosomatidea

{{Short description|Class of worms}}

{{Automatic taxobox

| taxon = Phascolosomatidea

| image = Phascolosoma turnerae - journal.pone.0053590.g003-e.png

| image_caption = Phascolosoma turnerae

| authority =

| subdivision_ranks = Orders

| subdivision = * Aspidosiphonida

• Phascolosomatida

}}

Phascolosomatidea is a subclass of the class Sipuncula, the peanut worms,{{Cite journal | doi = 10.1186/1471-2164-10-136| title = A close phylogenetic relationship between Sipuncula and Annelida evidenced from the complete mitochondrial genome sequence of Phascolosoma esculenta| journal = BMC Genomics| volume = 10| pages = 136| year = 2009| last1 = Shen | first1 = X. | last2 = Ma | first2 = X. | last3 = Ren | first3 = J. | last4 = Zhao | first4 = F. | pmid=19327168 | pmc=2667193| doi-access = free}} containing two orders:-{{cite WoRMS |author= |year=2018 |title=Phascolosomatidea |id=1295 |accessdate=6 December 2018 }}

• Aspidosiphonida containing the single family Aspidosiphonidae
• Phascolosomatida containing the single family Phascolosomatidae

Their hooks are arranged in regular rings.{{cite book

| url = https://books.google.com/books?id=CIuxgRI-28kC&dq=Phascolion+spines&pg=PA114

| title = The Sipuncula: Their systematics, biology, and evolution

| isbn = 978-0-8014-2843-2

| last1 = Cutler

| first1 = Edward Bayler

| year = 1994| publisher = Cornell University Press

}}