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Pachymatisma johnstonia

Pachymatisma johnstonia

Elephant's hide sponge

   Pachymatisma johnstonia is a massive sponge which may reach 40 cm in diameter and 10 cm in height. It has rounded margins and elongate lobes with a very smooth surface. Oscules are gathered in linear groups on the top of the lobes. Colour varies from greish white to dark purplish grey. It has a firm rubbery consistency.
It is attached to rocks, from swallow waters to depths up to 300 meters, in the English Channel, the Atlantic ocean from the North of the British Isles down to Spain and in the Mediterranean Sea.

Classification

 (source: European Register of Marine Species)

  • Porifera [Phylum]
  • Demospongiae [Class]
  • Astrophorida [Order]
  • Geodiidae [Family]
  • Pachymatisma johnstonia Bowerbank in Johnston, 1842

Page glossary


Oscule : Opening generally quite visible, through which sponges expel water they have filtered to extract food particles.

Pachymatisma johnstonia. Pachymatisma johnstonia
Massive form.

 
 

Authors


Top photograph :
© Wilfried Bay-Nouailhat. Published with author's kind permission : 
Pachymatisma johnstonia, Ile de Groix, South-Brittany, West of France. Depth 28 meters.
Bottom photograph : © Wilfried Bay-Nouailhat. Published with author's kind permission : 
Pachymatisma johnstonia, Massive form.. Ile de Groix, South-Brittany, West of France. Depth 28 meters.
Text :  Wilfried Bay-Nouailhat © 2006-2017.
Translation :  Anne Bay-Nouailhat © 2007-2017.

How to cite this page in publications


Bay-Nouailhat W., April 2006, Description of Pachymatisma johnstonia, Available on line at http://www.european-marine-life.org/02/pachymatisma-johnstonia.php, consulted on 23 March 2017.
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