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Virgularia mirabilis

Virgularia mirabilis

Slender sea pen

   Virgularia mirabilis is a sea pen of up to 60 cm tall. Its leaf-like tiny branches tappering at the bottom and the top of the colony give it a delicate feather-shape. Generally, the internal calcareous axis is visible at the upper end of the sea pen. Embedded in mud, the long stalk reaches the half of the whole length of the colony. In the upper part, the rachis bears polyps in leaf-like series of 5 to 12 autozooids on each side of the straight central axis. Siphonozooids, in an oblique row at the base of each "leaf", are not much visible. Colonies vary from white to yellow and can luminesce in darkness. When disturbed, colonies may quickly and entirely withdraw in the substratum.
Virgularia mirabilis is found in sheltered areas with soft bottoms such as fine sand or mud, from 10 meters down to 400 meters deep, in the North-East Atlantic Ocean, the English Channel, the North Sea and the Mediterranean Sea, and also in the North-West Altantic along the North-American coasts.

Classification

 (source : European Register of Marine Species)

  • Cnidaria [Phylum]
  • Anthozoa [Class]
  • Octocorallia [Subclass]
  • Pennatulacea [Order]
  • Subsessiliflorae [Suborder]
  • Virgulariidae [Family]
  • Virgularia mirabilis (Müller, 1776)

Page glossary


Colony : Group of several individuals of the same species. There, the colony has several individuals, the polyps, but the whole colony is considered as the animal.
Polyps : Within these colonial animals, the polyp is the individual.
Rachis : Upper part of the Pennatulacea bearing polyps.
Autozooids : Specialized polyps in charge of catching food.
Siphonozooids : Specialized polyps without tentacles in charge of driving water into the colony.

Authors


Top photograph :
© Mat Vestjens. Published with author's kind permission : 
Virgularia mirabilis, Oban, West Highlands, West Scotland. Depth 16 meters.
Text :  Wilfried Bay-Nouailhat © 2008-2017.
Translation :  Anne Bay-Nouailhat © 2008-2017.

How to cite this page in publications


Bay-Nouailhat W., September 2008, Description of Virgularia mirabilis, Available on line at http://www.european-marine-life.org/05/virgularia-mirabilis.php, consulted on 24 April 2017.
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