Aplidium punctum is a colonial ascidian forming capitate colonies reaching 6 cm in height. Up to forty zooids are embedded in a common test forming a flat-topped lobe arising from a stalk. The base of the colony is often encrusted with sand. The test is transluscent and the general colour of the colony is pale orange. Each zooid has a six-lobed oral siphon and a red spot at the upper-end of the endostyle. Colonies of orange flake-ascidians often live aggregated, forming bunches attached to rocks from low water level to 25 meters deep.
Aplidium punctum is found in the North-East Atlantic and the English Channel.
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Source : World Register of Marine Species
Aplidium punctum (Species)
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.
Endostyle : groove through which food particles are moved up to the oesophagus.
Text : Anne Bay-Nouailhat © 2005 - 2021.
Photos : ©
Wilfried Bay-Nouailhat. Published with his kind permission.
Websites and reference works : Consult bibliography
Bay-Nouailhat A., March 2005, Description of Aplidium punctum, [On line] http://www.european-marine-life.org/32/aplidium-punctum.php, consulted on 2021 October 18.
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