Overview

Comprehensive Description

General Description

Bugula turbinata is an erect bryozoan, found in the southern part of Britain. The colonies are composed of dichotomous branches arranged spirally around the main axis to form bushy tufts. The species is orange-brown in colour and is typically 3 – 6 cm high. Autozooids are rectangular, sometime narrowing at the proximal end, closest to the colony origin.

The species is able to colonise hard substrates and is characteristically found on the underside of boulders and in gullies near the low water mark. It is the only British Bugula species that is really characteristic of the shore, but it can also be found in shallow subtidal waters on stones and shells.

Bugula turbinata is found in the south of Britain, extending north to the Clyde Sea on the west coast and Northumberland on the east.

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© Natural History Museum, London

Source: Bryozoa of the British Isles

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Description

 Bugula turbinata forms an erect, bushy, tufted colony about 3-6 cm in height and orange to brown in colour. The branches are arranged spirally around the main axis and composed of two rows of zooids proximally, increasing to 3-4 rows distally. Individual zooids are rectangular, 0.5-0.6 by 0.15-0.2 mm, narrowing slightly at their proximal end and bearing a single short spine at each corner of the distal end. The front of the zooid is almost entirely membranous. The polypide bears 13 tentacles. Avicularia arise just below the spines and are short and plump resembling a 'birds head', with a rectangularly hooked beak. Inner avicularia are smaller than marginal ones. Brood chambers (ooecia) are globular in shape and conspicuous. Colonies are attached to the substratum by extensions of the basal zooids (rhizoids). Yellow embryos are present from early May to November.All British species of Bugula die back in autumn, over-wintering as ancestrulae, colony stumps or stolons (Hayward & Ryland, 1998). Little information was found on the biology and sensitivity of Bugula turbinata. The following review has been derived from information concerning other species of Bugula where possible.
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©  The Marine Biological Association of the United Kingdom

Source: Marine Life Information Network

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Distribution

In 1904 werd een exemplaar gedregd vóór de Belgische kust op 51°21’N-2°32’O en in 1911 bij de Droogte van Schooneveld (collectie KBIN). Er zijn geen recente vondsten uit België. In Nederland is deze soort aangetroffen op aangespoelde Flustra foliacea op Texel (de Ruijter, 2004) en op aangespoeld plastic bij Egmond aan Zee (de Ruijter, 2006a).
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© WoRMS for SMEBD

Source: World Register of Marine Species

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Physical Description

Diagnostic Description

Description

Vormt bosjes tot 6 cm hoog. De takjes staan spiraalvormig ingeplant op de hoofdas. De takjes zijn proximaal smal en bestaan uit twee rijen zoïden. Distaal worden ze breder en meerrijig. Het grootste deel van het frontale zoïdenoppervlak membraneus. Stekelformule 1:1. Polypide met 13 tentakels. Avicularia net onder de stekel vastgehecht. Deze op de binnenste zoïden zijn veel kleiner dan deze op de marginale zoïden. De bek is kort en als een haak omlaag gebogen. Broedkamers haast bolvormig. Embryo’s geel, aanwezig van augustus tot november.
  • 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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© WoRMS for SMEBD

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 2 samples.

Environmental ranges
  Depth range (m): 5 - 29
  Temperature range (°C): 11.353 - 11.646
  Nitrate (umol/L): 5.677 - 6.621
  Salinity (PPS): 35.218 - 35.237
  Oxygen (ml/l): 6.151 - 6.213
  Phosphate (umol/l): 0.425 - 0.482
  Silicate (umol/l): 2.726 - 2.892

Graphical representation

Depth range (m): 5 - 29

Temperature range (°C): 11.353 - 11.646

Nitrate (umol/L): 5.677 - 6.621

Salinity (PPS): 35.218 - 35.237

Oxygen (ml/l): 6.151 - 6.213

Phosphate (umol/l): 0.425 - 0.482

Silicate (umol/l): 2.726 - 2.892
 
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 Present on the walls of gullies and under boulders on the lower shore and on bedrock, boulders, stones and shells in the shallow subtidal.
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Source: Marine Life Information Network

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