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Clavelina lepadiformis

Clavelina lepadiformis

Clavelina

   Clavelina lepadiformis is a colonial ascidian living in groups of 3 to 3OO zooids. They are elongated, cylindrical and up to 2 cm tall. The test is smooth and completely transparent so that the branchial sac is clearly visible. The endostyle, the dorsal axis, the margin of the oral and atrial siphons as well as the upper part of the pharynx are underlined by a thin white or yellowish line. The zooids are joined together by a short basal stolon that cling on rocks, seaweeds or piles.
It is found from surface to 50 m deep in the Atlantic Ocean, the North Sea, the English Channel and in the Mediterranean Sea.

Classification

 (source : European Register of Marine Species)

  • Chordata [Phylum]
  • Tunicata [Subphylum]
  • Ascidiacea [Class]
  • Enterogona [Order]
  • Aplousobranchia [Suborder]
  • Clavelinidae [Family]
  • Clavelina lepadiformis (O F Müller, 1776)

Page glossary


Zooid : Individual, single animal.
Test : or tunic: thick layer secreted by the mantel containing cellulose and protecting the animal.
Oral siphon : Opening by which water is drawn in the ascidian.
Atrial siphon : Opening through which water is expelled.
Endostyle : Groove through which food particles are moved up to the oesophagus.
Stolon : Root-like element binding together the individuals of a colony.

Clavelina lepadiformis. Clavelina lepadiformis
Close view

Clavelina lepadiformis. Clavelina lepadiformis
Detail of the siphons

 

Authors


Top photograph :
© Wilfried Bay-Nouailhat. Published with author's kind permission : 
Clavelina lepadiformis, Illes Medes, Costa Brava, East of Spain. Depth 7 meters.
Bottom photographs : © Wilfried Bay-Nouailhat. Published with author's kind permission : 
Clavelina lepadiformis, Close view. Ria d'Etel, South Brittany, West of France. Depth 8 meters.
© Wilfried Bay-Nouailhat. Published with author's kind permission : 
Clavelina lepadiformis, Detail of the siphons. Illes Medes, Costa Brava, East Spain. Depth 12 meters.
Text :  Anne Bay-Nouailhat © 2005-2017.
Translation :  Anne Bay-Nouailhat © 2007-2017.

How to cite this page in publications


Bay-Nouailhat A., September 2005, Description of Clavelina lepadiformis, Available on line at http://www.european-marine-life.org/32/clavelina-lepadiformis.php, consulted on 22 May 2017.
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