Colonies form large orange crusts that spread irregularly and are often fringed with green.

Belgian Exclusive Economic Zone, Portuguese Exclusive Economic Zone, Spanish Exclusive Economic Zone

Oshurkovia littoralis (previously Umbonula littoralis) is an encrusting bryozoan that develops broad spreading sheets, composed of a single layer of autozooids. Colonies are dull orange in colour and may become extensive. Autozooids are oval to hexagonal. The species lacks avicularia and ovicells.

Depth range based on 108 specimens in 1 taxon.
Water temperature and chemistry ranges based on 20 samples.

Environmental ranges
  Depth range (m): 0 - 36.6
  Temperature range (°C): 10.558 - 12.348
  Nitrate (umol/L): 3.925 - 6.621
  Salinity (PPS): 34.671 - 35.363
  Oxygen (ml/l): 6.128 - 6.215
  Phosphate (umol/l): 0.336 - 0.482
  Silicate (umol/l): 2.314 - 3.285

Graphical representation

Depth range (m): 0 - 36.6

Temperature range (°C): 10.558 - 12.348

Nitrate (umol/L): 3.925 - 6.621

Salinity (PPS): 34.671 - 35.363

Oxygen (ml/l): 6.128 - 6.215

Phosphate (umol/l): 0.336 - 0.482

Silicate (umol/l): 2.314 - 3.285
 
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Oshurkovia littoralis is able to colonise stones and shells, clumps of larger hydroids, the underside of the button-like thali of Himanthalia seaweed and Laminaria holdfasts. Extensive colonies are frequently found on the underside of flat stones or on shaded overhangs. The species is common in the British intertidal zone, extending from the mean tide level into the kelp zone, but probably no deeper

 A characteristic species of the sublittoral fringe and underboulder habitats. Occurs on rock and on Laminaria spp. holdfasts and Himanthalia elongata buttons.

Plant / epiphyte
Umbonula littoralis grows on holdfast of Laminaria
Other: major host/prey