Abstract
The hydroid Thyroscyphus ramosus is redescribed based on optical and SEM observations of morphology and on histological studies. Colonies from several localities extending over a coastline distance of over 4,000 km in Brazil were studied to establish intraspecific variations using morphometrical parameters in a correspondence analysis. We conclude that differences noted in some populations were taxonomically insignificant, and related to non–historical factors such as microhabitat diversity.References
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