Beania mirabilis is an inconspicuous encrusting bryozoan. Colonies are diffuse, ramifying over the substrate. They attach to the substrate by root-like rhizoids, growing from the basal surface at proximal end (closest to the colony origin) of an autozooid. The rhizoids terminate in a attachment disc. Autozooids are boat-shaped, contracted above and bulging below. They are suberect, with a free distal portion, and spines arranged along the outer edge. Typically 0.6-0.65 by 0.15 mm.

The species is able to colonise a range of substrate including shells and other Bryozoa e.g. Cellaria, Flustra and Pentapora. It is especially found on kelp (Laminaria) holdfasts. It ranges from the very lower intertidal down to 130 m.

This species is inconspicuous and therefore not often recorded. It is distributed from the Skaggerak and the British Isles, southwards through the Atlantic to the Indo-Pacific.

Belgian Exclusive Economic Zone, Dutch Coast, European waters (ERMS scope), Gulf of Mexico, Irish Exclusive economic Zone, Japan, Oostende, Pacific Ocean, Portuguese Exclusive Economic Zone, Red Sea, Spanish Exclusive Economic Zone, United Kingdom Exclusive Economic Zone, Zeebrugge

Known from seagrass beds.

Depth range based on 14 specimens in 1 taxon.
Water temperature and chemistry ranges based on 5 samples.

Environmental ranges
  Depth range (m): 6 - 539
  Temperature range (°C): 11.319 - 24.169
  Nitrate (umol/L): 0.943 - 8.636
  Salinity (PPS): 35.470 - 38.824
  Oxygen (ml/l): 4.703 - 5.712
  Phosphate (umol/l): 0.123 - 0.460
  Silicate (umol/l): 1.297 - 2.685

Graphical representation

Depth range (m): 6 - 539

Temperature range (°C): 11.319 - 24.169

Nitrate (umol/L): 0.943 - 8.636

Salinity (PPS): 35.470 - 38.824

Oxygen (ml/l): 4.703 - 5.712

Phosphate (umol/l): 0.123 - 0.460

Silicate (umol/l): 1.297 - 2.685
 
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