Aspidosiphonidae is a

family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...

of peanut worms. It is the only family in the

monotypic In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one that does not include subspecies or smaller, infraspecific taxa. In the case of genera, the term "unisp ...

order Aspidosiphonida, which is in the class

Phascolosomatidea Phascolosomatidea is a subclass of the class Sipuncula The Sipuncula or Sipunculida (common names sipunculid worms or peanut worms) is a class containing about 162 species of marine annelid worms, that have secondarily lost their segmentat ...

.Gibbs, P.E. (1977): British sipunculans. Academic Press. London. 35p. 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):826-86
Bistor
/ref>Cutler, Edward B. (1994): The Sipuncula: their systematic, biology and evolution. 406p
Google Books
/ref>

Description

The family Aspidosiphonidae is characterized by an oval disk with short tentacles, arranged in a crescent-shape made of an enclosed

nuchal organ The nuchal organ is a ciliated pit or groove present at the posterior end of the prostomium of annelid worms, some cephalopods, and other invertebrates. Annelids only possess one nuchal organ, although the nature of the grooving may make it appea ...

. 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 The nephridium (: nephridia) is an invertebrate organ, found in pairs and performing a function similar to the vertebrate kidneys (which originated from the chordate nephridia). Nephridia remove metabolic wastes from an animal's body. Nephridia co ...

Species

Aspidosiphon

* '' Aspidosiphon albus'' Murina, 1967 (1973): Sipuncula of the Western North Atlantic. ''Bulletin of American Museum of Natural History'' 152(3)103-201. New York. * '' Aspidosiphon coyi'' de Quatrefages, 1865 * '' Aspidosiphon elegans'' (Chamisso and Eysenhardt, 1821) * '' Aspidosiphon exiguus'' Edmonds 1974 * '' Aspidosiphon fischeri'' Broeke, A. ten, 1925 * ''

Aspidosiphon gosnoldi 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. Ditadi, A.S.F. & Migotto, A ...

'' Cutler, E., 1981 * '' Aspidosiphon gracilis'' (Baird, 1868) * ''

Aspidosiphon laevis 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. Ditadi, A.S.F. & Migotto, A ...

'' de Quatrefages, 1865 * ''

Aspidosiphon mexicanus 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. Ditadi, A.S.F. & Migotto, A ...

'' Murina, 1967 * ''

Aspidosiphon misakiensis 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. Ditadi, A.S.F. & Migotto, A ...

'' Ikeda 1904 * '' Aspidosiphon muelleri'' Diesing 1851 * ''

Aspidosiphon parvulus 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. Ditadi, A.S.F. & Migotto, A ...

'' Gerould, 1913 * ''

Aspidosiphon planoscutatus 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. Ditadi, A.S.F. & Migotto, A ...

'' Murina, 1968 * ''

Aspidosiphon spiralis 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. Ditadi, A.S.F. & Migotto, A ...

'' Sluiter, 1902 * ''

Aspidosiphon steenstrupii Aspidosiphonidae is a Family (biology), family of peanut worms. It is the only family in the Monotypic taxon, monotypic order Aspidosiphonida, which is in the class Phascolosomatidea.Gibbs, P.E. (1977): British sipunculans. Academic Press. London ...

'' Diesing, 1859 * ''

Aspidosiphon tenuis 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. Ditadi, A.S.F. & Migotto, A ...

'' Sluiter, 1886 * ''

Aspidosiphon thomassini Aspidosiphonidae is a Family (biology), family of peanut worms. It is the only family in the Monotypic taxon, monotypic order Aspidosiphonida, which is in the class Phascolosomatidea.Gibbs, P.E. (1977): British sipunculans. Academic Press. London ...

'' Cutler and Cutler, 1979 * ''

Aspidosiphon venabulum 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. Ditadi, A.S.F. & Migotto, A ...

'' Selenka & Bulow, 1883 * ''

Aspidosiphon zinni 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. Ditadi, A.S.F. & Migotto, A ...

'' Cutler, 1969

Cloeosiphon

* '' Cloeosiphon aspergillus'' (de Quatrefages, 1865)

Lithacrosiphon

* '' Lithacrosiphon cristatus'' (Sluiter, 1902) * '' Lithacrosiphon maldivensis'' Shipley 1902

References

External links

Sipuncula LifeDesk: Aspidosiphonidae
{{Authority control Sipunculans Annelid families