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Comprehensive Description

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General Description

The light brown/orange tube is straight and very stiff, with thick, strong walls tapering towards the posterior end, which becomes slightly sinuous but remains thick-walled. There is a short, transparent anterior part, which is soft and thin walled. The diameter of the tube varies from 0.57 to 2.05 mm. The tentacles (80 to 100) are arranged in a spiral crown with 5 turns. The spire is leotropic, its direction of turn (when viewed from the anterior end) being anti-clockwise in all the specimens examined. The tentacles adhere side by side and have pinnules in a quadruple row on the zone facing the inside of the crown. The bases of the tentacles are situated on one plane on a tablelike broadening of the forepart, without a lophophore. The whole tentacular crown is up to 22.8 mm in length. The forepart of the body is 2 to 4 times as long as wide, the maximum length and diameter recorded being respectively 4.7 mm and 1.2 mm. The cephalic lobe is very wide and dorso-ventrally flattened. A mid-dorsal longitudinal groove extends along the whole length of the dorsal side of the forepart; on the ventral side there is a shallow groove that extends posteriorly from the ends of the bridle keels. The brown bridle keels are always separate,turning posteriorly and running parallel on both the dorsal and ventral side. A slight external groove separates the forepart from the trunk. On the anterior part of the trunk there are two rows of about 40 metamerically arranged papillae separated by a deep and narrow median furrow. Each papilla is topped by an oval cuticular plaque, about 70 x 40 μm, with a thickened, bowshaped front edge. Posteriorly, the mid-dorsal furrow widens and another up to 100 papillae, not so tightly arranged, with plaques, continue along its edges. The ventral side of the trunk is slightly concave and latero-ventrally there are numerous small, plaqueless papillae tightly arranged. On the ventral side, anterior to the girdles, there is a series of digitiform ridges forming a deep sulcus. On the dorsal side there is a group of about 10 enlarged papillae anterior to and between the girdles, and a larger papilla behind the posterior girdle. The two girdles, lying on very thick muscular ridges, are close together, approximately 0.5 mm apart, and are both interrupted dorsally and ventrally. The chaetae are arranged in 5 rows, their heads are slipper-shaped, 22 to 24 µm long, with a small anterior group of smaller teeth and a larger posterior group of larger teeth facing opposite directions. On the dorsal side of the postannular region of the trunk, at regular intervals of about 2 mm, there are transverse rows of 4 or 5 papillae with oval plaques with a median ridge. On the ventral side there is little or no development of glands. The opisthosoma was missing in all the specimens analyzed. Hilario and Cunha 2008

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