Comprehensive Description

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General Description

The external anatomy of Xenosiphon branchiatus is similar to species of the genus Sipunculus, but a distinguishing character is the “fuzzy” appearance of the middle trunk region. In the genus Sipunculus, only S. longopapilosus could be confused externally with X. branchiatus, because both have elongated papillae in the middle trunk. But the internal characteristics, such as the extra retractor muscle, attachment of the spindle muscle on the ventral side of the rectum, and the nephridial openings posterior to the anus are exclusive characteristics of X. branchiatus.

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© Kawauchi, Gisele Y.

Source: Sipuncula LifeDesk

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