Herdmania pallida

The round and soft bodies have a thick tunic often covered with epibionts. The dorsal side and the siphons are often red in life. The siphons are distant of 1 / 3 of the body length and their aperture shows blue and red iridescent colours and white spots (Fig. 4 A, B). The dorsal tubercle is large with inrolled horns. The dorsal lamina has sharp languets. The branchial sac has an average of 9 high folds on the right side and sometimes there is a 10 th incomplete fold, and a fold less on the left side. The hepatic gland is divided into 3 parts: 2 lobes on each side of the cardia and a larger lobe covering the pyloric side of the stomach (Fig. 4 A). The gut loop is high and widely opened (Fig. 4 A). There is one tubular and straight gonad on each body side (Fig. 4 A). Oviduct and sperm duct open close to each other in simple holes. The anus has a smooth edge (Fig. 4 B). There is a large velum at both siphon apertures. All tissues are filled with acicular spicules.