A redescription of the brackish-water sea anemoneNematostella vectensisStephenson, with an appraisal of congeneric species

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Abstract
A rare brackish-water sea anemone, Nematostella vectensis Stephenson, 1935, is redescribed. Some differences between previous descriptions are reconciled, in particular the cnidom measurements and variations in pigmentation. Relations with other members of the genus are discussed. The nominal species N. pellucida Crowell, 1946, is regarded as conspecific with N. vectensis. The morphology of the adherent rugae (used in burrowing and climbing), the morphology of a larval stage, the origin of the nematosomes (characteristic of the genus) and some notably malformed specimens of N. vectensis are all described for the first time. Specimens up to twice the maximum size of those previously described are recorded.

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