Didemnum galacteum

Station. SS 6 and 1980 Guiana I. Royale (Monniot collection). The colonies are thick crusts, brittle, with dense spicules made of blunt rays. The anatomical characters well correspond to the type description with a narrow atral opening without languet, a long oesophageal neck with a long thoracic muscular appendage. The sperm duct in 8 – 9 turns lies on 2 large testis lobes. The larva 0.65 mm long has 3 adhesive papillae and 4 pairs of ampullae (Fig. 4 B). As noticed by Lotufo & Dias Didemnum species without atrial languet and 2 testis lobes are not common and only represented in the western Atlantic by D. galacteum and D. duplicatum.