Overview

Distribution

Twee kolonies werden verzameld op de Vlaamse Banken in 1904, een derde in 1906. In juni 2005 werden 35 overleden kolonies aangetroffen op stenen en schelpen op de Hinderbanken. In België af en toe op aangespoeld plastic, in Westkapelle in Nederland op een aangespoelde kreeftenfuik in 2004. Bloklander & Leenhouts (1948) melden het aanspoelen in Nederland in het najaar van 1947.
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Source: World Register of Marine Species

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Escharella variolosa is widespread throughout the NE Atlantic and western Mediterranean. It has been reported from the southern North Sea, the English Channel and the Scilly Isles, but is apparently rare or absent from the north-east coasts of the British Isles.

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Source: Bryozoa of the British Isles

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Physical Description

Morphology

Escharella variolosa is an encrusting bryozoan. Colonies form bright, glistening sheets which are white or straw coloured. The sheets are composed of a single layer of autozooids and normally cover an extensive area. Autozooids are hexagonal or quadrate, often elongated, flat or slightly convex. They range in size from 0.6-0.8 by 0.3-0.5 mm, with two (rarely three) spines present. The zooids are arranged in regular, straight oblique rows.

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Source: Bryozoa of the British Isles

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Diagnostic Description

Description

Vormt vaak grote vlakke korsten. Zoïden langwerpig, vlak of weinig convex. Frontaal korrelig en glasachtig. De marginale poriën liggen dicht opeen en zijn gescheiden door richels. Opening rond, lyrula slank aambeeldvormig, geen scharnierpunten. Twee, soms één of drie distale orale stekels. Proximale bult puntig, soms met twee spitsen. Broedkamers breder dan lang, korrelig en verzonken in het oppervlak van de kolonie. Embryo’s oranje. Ancestrula ovaal met frontaal membraan omringd door 9 stekels.
  • De Blauwe, H. (2009). Mosdiertjes van de Zuidelijke Bocht van de Noordzee. Determinatiewerk voor België en Nederland. Uitgave Vlaams Instituut voor de Zee, Oostende: 464pp.
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Source: World Register of Marine Species

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Ecology

Habitat

Depth range based on 12 specimens in 1 taxon.
Water temperature and chemistry ranges based on 11 samples.

Environmental ranges
  Depth range (m): 20 - 96
  Temperature range (°C): 9.728 - 11.905
  Nitrate (umol/L): 3.145 - 6.408
  Salinity (PPS): 34.633 - 35.178
  Oxygen (ml/l): 6.017 - 6.364
  Phosphate (umol/l): 0.239 - 0.682
  Silicate (umol/l): 2.295 - 5.963

Graphical representation

Depth range (m): 20 - 96

Temperature range (°C): 9.728 - 11.905

Nitrate (umol/L): 3.145 - 6.408

Salinity (PPS): 34.633 - 35.178

Oxygen (ml/l): 6.017 - 6.364

Phosphate (umol/l): 0.239 - 0.682

Silicate (umol/l): 2.295 - 5.963
 
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The species is able to colonise hard substrates. It occurs on other Bryozoa such as Cellaria sp and is often abundant on flat shells such as Ostrea, Chlamys and Pecten. It ranges from shallow inshore waters to at least 100 metres, but is thought to be absent from deeper waters.

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Source: Bryozoa of the British Isles

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