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Aspidosiphonidae
''Aspidosiphonidae'' is a family of peanut worms. It is the only family in the Aspidosiphoniformes, 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 (Bistor )〕〔Cutler, Edward B. (1994): The Sipuncula: their systematic, biology and evolution. 406p ISBN 0-8014-2843-2 (Google Book )〕
== Description ==
The Aspidosiphonidae family is characterized by an oral disk with short tentacles arranged in a crescent enclosing nucal organ. Present a coelomisd canal of sacs not present in body wall the longitudinal muscles layer either continuous or in band. Present anterior and terminal trunk chitinized to form anal shield, the posterior end usually likewise modified to form caudal shield. Have two nephridia.〔〔〔〔
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