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(Verrill, 1871)

Description

External appearance
Colonial, with zooids wholly immersed. Colonies consist of upright, flat-topped fleshy lobes which are up to 2 cm in height. Common test grey and semi-transparent, sides and base coated with sand.
The zooids are visible through the test of the colony (A. glabrum close-up).
Larva unknown.

Characters
Zooids coloured yellowish to orange; up to 10 mm in length; body divided into thorax, abdomen and post-abdomen. Oral siphon 6-lobed; atrial opening with languet bearing long median and small lateral processes. Branchial sac with 10-12 rows of 16-18 stigmata. Gut abdominal; stomach with continued or interrupted longitudinal folds. Gonads located in post-abdomen; with ovaries in the upper part and the male follicles forming a double row beneath them (A. glabrum zooid).

Habitat
Attached to hard substrata; from low water line to about 400 metres.

Distribution
Arctic-Boreal distribution.

Aplidium glabrum