The vestimental region is relatively long, representing about 11% of the total body length. There are six pairs of tentacular lamellae which are not fringed with free tips. The ventral sides of the margins of the vestimental wings do not show any ornamentation. The dorsal side of the trunk is provided with a series of transverse grooves, just behind the vestimental region. The neurular tube of the trunk is only present in its anterior part. There is a real common excretory duct, its epithelium is not provided with a cuticular lining. The two sperm ducts join to form a common sperm duct in the vestimental region. The two male gonopores as well as the posterior parts of the vestimental ridges lie close together. The tube is rather smooth along its whole length and has no conspicuous collars.
(van der Land & Norrevang, 1977)
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