Aspidosiphonidae

{{Short description|Family of peanut worms}}

{{Automatic taxobox

| image = Aspidosiphon steenstrupii (Sipuncula).jpg

| image_caption = Aspidosiphon steenstrupii

| taxon = Aspidosiphonidae

| authority = Quatrefages, 1865

| subdivision_ranks = Genera

| subdivision = *Aspidosiphon Diesing, 1851

}}

Aspidosiphonidae is a family of peanut worms. It is the only family in the monotypic order Aspidosiphonida, which is in the class Phascolosomatidea.Gibbs, P.E. (1977): British sipunculans. Academic Press. London. 35p. {{ISBN|0-12-282050-9}}Ditadi, A.S.F. & Migotto, A.E. (1982): O Filo Sipuncula. Concelho Nacional de Desemvolvimento Cientifico e Tecnologico CNPq Brasilia. 43p.Cutler, Edward B. & Gibbs, Peter E. (1985): A Phylogenetic analysis of higher taxa in the Phylum Sipuncula. Systematic Zoology 34(2):162-173.Cutler, Edward B. & Cutler, Norma J (1989): A revision of the genus Aspidosiphon (Sipuncula: Aspidosiphonidaea). Proceedings of Biological Society of Washington 102(4):826-865 [http://biostor.org/reference/65734.text Bistor]Cutler, Edward B. (1994): The Sipuncula: their systematic, biology and evolution. 406p {{ISBN|0-8014-2843-2}} [https://books.google.com/books?id=CIuxgRI-28kC Google Books]

Description

The family Aspidosiphonidae is characterized by an oval disk with short tentacles, arranged in a crescent-shape made of an enclosed nuchal organ. It has a canal of sacs in the coelom, lying in a continuous band. The anal and caudal shield (at the anterior end) are both made up, not of chitin, but of a horny protein. It is of note that most, but not all, of the Aspidosiphonidae family has a caudal shield. The family also has two nephridia.

Species

=Aspidosiphon=

=Cloeosiphon=

=Lithacrosiphon=

References

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