The distribution and abundance of polychaetous annelids in a subtropical estuarine environment were investigated. The area contained zones of Thalassia testudinum, Diplanthera wrightii, and sand. Quarterly samples were taken from stations established within all zones. No seasonal
differences in particle size distribution of sediment were found. The Thalassia zone was found to support the largest number of organisms. Onuphis eremita oculata was the dominant polychaete. Czekanowski's coefficient and group average sorting were used to determine relationships
among the fauna from each zone. Information statistic tests were utilized to delineate classes. It was shown that different assemblages of polychaetes were not associated with different vegetative zones. The densities of the individual species from the one assemblage present in Lassing Park,
St. Petersburg, Florida, varied by season and by zone.
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