Aspidosiphonidae
Aspidosiphonidae is a family of peanut worms. It is the only family in the monotypic order Aspidosiphonida, which is in the class Phascolosomatidea.
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 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
Aspidosiphon albus Murina, 1967Aspidosiphon coyi de Quatrefages, 1865Aspidosiphon elegans Aspidosiphon exiguus Edmonds 1974Aspidosiphon fischeri Broeke, A. ten, 1925Aspidosiphon gosnoldi Cutler, E., 1981Aspidosiphon gracilis Aspidosiphon laevis de Quatrefages, 1865Aspidosiphon mexicanus Murina, 1967Aspidosiphon misakiensis Ikeda 1904Aspidosiphon muelleri Diesing 1851Aspidosiphon parvulus Gerould, 1913Aspidosiphon planoscutatus Murina, 1968Aspidosiphon spiralis Sluiter, 1902Aspidosiphon steenstrupii Diesing, 1859Aspidosiphon tenuis Sluiter, 1886Aspidosiphon thomassini Cutler and Cutler, 1979Aspidosiphon venabulum Selenka & Bulow, 1883Aspidosiphon zinni Cutler, 1969
Cloeosiphon
Lithacrosiphon
Lithacrosiphon cristatus Lithacrosiphon maldivensis Shipley 1902