Description:-
The colony consists of lobed masses of spherical outline. The zooids are located in circular systems around very small central cloacal apertures. The zooid thoraces are red in life; the abdomens are colourless in a colourless tunic. Some lobes of the colonies consists of only one system, but most often the lobes are grouped in large common masses. The zooids are thin and long. The oral siphon has eight small lobes. The narrow cloacal siphon is prolonged by a trifid languet that extends its upper rim. The longitudinal thoracic musculature is made up of 7-8 muscles on each side, issuing from the oral siphon, and 4-6 muscles coming from the cloacal siphon. The branchial sac has five rows of 12-13 stigmata on each side. The abdomen is narrower than the thorax. The stomach wall has five deep folds. The mid intestine is olive shaped and the rectum begins with caeca. The post-abdomen is long, even when it does not contain gonads. The ovary is far from gut, half way along the post-abdomen. Few testicular vesicles occur in a single row before and behind the ovary, but do not reach the cardiac extremity.
Two to three larvae are incubated in the peribranchial cavity. They are small with an average trunk length of 0.5 mm. They have three well-spaced anterior adhesive papillae, between each of which is a branched protuberance of branched, small vesicles. Numerous small additional vesicles extend in an anterior crescent on each side of the papillae. The median vesicles between the papillae only appear at an advanced stage of the larvae.