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Home » Sipuncula » Animalia » Sipuncula » Phascolosomatidea » Aspidosiphoniformes » Aspidosiphonidae » Aspidosiphon » Aspidosiphon (Paraspidosiphon) » Aspidosiphon (Paraspidosiphon) steenstrupii Diesing, 1859 -
Sipuncula
Aspidosiphon (Paraspidosiphon) steenstrupii Diesing, 1859
Nomenclature
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Genus: AspidosiphonSubgenus: Aspidosiphon (Paraspidosiphon)
Species:
Aspidosiphon (Paraspidosiphon) steenstrupii Diesing, 1859
SUMMARY
Many specimens of A. steenstrupii have a characteristic calcium carbonate deposit covering the anal shield, which easily separates this species from the congeners. Other characters that help to define the species are the presence on the introvert of distal bidentate hooks followed by many dark scattered pyramidal hooks, a well-defined caudal shield and the division of longitudinal muscles into anastomosing bands.