Phascolosomatidea Explained

Phascolosomatidea is a subclass of the class Sipuncula, the peanut worms,^[1] containing two orders:-^[2]

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

Their hooks are arranged in regular rings.^[3]

Notes and References

1. 10.1186/1471-2164-10-136. A close phylogenetic relationship between Sipuncula and Annelida evidenced from the complete mitochondrial genome sequence of Phascolosoma esculenta. BMC Genomics. 10. 136. 2009. Shen . X. . Ma . X. . Ren . J. . Zhao . F. . 19327168 . 2667193. free.
2. 2018 . Phascolosomatidea . 1295 . 6 December 2018 .
3. Book: The Sipuncula: Their systematics, biology, and evolution . 978-0-8014-2843-2 . Cutler . Edward Bayler . 1994. Cornell University Press .