Nodding sea fir (Corymorpha nutans)
|Researched by||Saskiya Richards||Refereed by||Admin|
|Authority||M. Sars, 1835|
|Other common names||Nodding hydroid||Synonyms||-|
Corymorpha nutans is a solitary hydroid that grows up to 10 cm in height. The hydranth has a thick, cylindrical, elongated stem (hydrocaulus) that terminates in a disc-shape and is usually bent downwards. A thin, delicate, transparent, chitinous perisarc encases the lower two-thirds of the stem. The terminal end of the hydranth is marked by a conical hypostome that bears a mouth with a ring of 80 short, oral tentacles. A second ring of 32 white, long tentacles lies below the mouth. In between these two rings of tentacles are medusae-bearing reproductive gonophores, situated on 15-20 branched stalks. The basal end of the hydranth bears root-like threads that attach to the substrate. The hydranth is coloured white to pale red, darkening to bright red in the terminal mouth region.
Recorded distribution in Britain and IrelandCorymorpha nutans is recorded around the coasts of Britain and Ireland, except for the southeast.
Global distributionThe distribution of Corymorpha nutans extends from northern Norway to the mediterranean.
HabitatCorymorpha nutans inhabits silty mud, sand and gravel in the sublittoral zone to 100 m.
- Solitary hydroid up to 10 cm in height.
- Thick, cylindrical, elongated stem.
- Upper ring of 80 short, oral tentacles.
- Lower ring of 32 white, long tentacles.
- Stem is white to pale red.
- Mouth region bright red.
Corymorpha nutans can be mistaken for a sea anemone. Individual hydranths live for about 1 year.
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Last Updated: 03/07/2008