A hydroid - Thieliana navis - General information
Have you seen Thieliana navis?
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| Researched by:
|| Refereed by:
||Dr Richard S.K. Barnes
||Sea anemones, corals, sea firs & jellyfish
| Recorded distribution in Britain and Ireland
||Widewater lagoon, West Sussex.
| Habitat information
||Grows on algae such as Chaetomorpha. It has only ever been recorded in the vicinity of ports and harbours.
||A simple hydroid consisting of an erect, unbranched stem, up to 5 mm in height, with a single terminal polyp (hydranth) . Each upright stem rises from a creeping stolon (hydrorhiza). The stem is sheathed by a chitinous sheath, the perisarc. The perisarc is often wrinkled, especially near the base, and terminates below the hydranth. The hydranth bears 8 to 16 tentacles in 2 to 4 alternating whorls, depending on hydranth size. It is creamy white in colour, with hints of pink around the mouth of the hydranth. The reproductive bodies (gonophores) are borne on short stalks in an irregular spiral below the hydranth.
This review can be cited as follows:
Nicola White 2005.
Marine Life Information Network: Biology and Sensitivity Key Information Sub-programme [on-line].
Plymouth: Marine Biological Association of the United Kingdom.
Available from: <http://www.marlin.ac.uk/speciesfullreview.php?speciesID=4461>