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From 22 stations in the Indian River Lagoon, ranging from Haulover Canal in the north to St. Lucie Inlet in the south, 18 species of sipunculans are reported. Habitats include oyster beds, subtidal and intertidal sand, seagrass beds, and sea walls. The greatest number of species occurs
near inlets: Sebastian, Fort Pierce, and St. Lucie. The most widely distributed sipunculan in the Indian River Lagoon is Phascolion cryptum, averaging 3 cm in length. Usually buried in the upper 5 cm of sandy sediments associated with seagrass beds, it inhabits discarded gastropod shells
in shallow waters throughout the lagoon. Development is direct, a crawling vermiform stage hatching from egg coverings within 2 days. The second most widely distributed sipunculan is Themiste lageniformis. attaining a maximum extended length of 4 cm. Occurring most commonly near the
inlets of Fort Pierce and Saint Lucie, it is associated either with oyster beds, where it lives in and among the shells, or with the encrusting fauna on sea walls, among the vermetid snails, sponges, and tunicates. In oyster beds near Fort Pierce it occurs in densities as great as 2,100·m2.
This species is parthenogenic; its development includes a short-lived non-feeding pelagic larval stage. Other species, found mostly in relatively small numbers near the inlets, are characterized generally by developmental patterns with long-lived feeding pelagic larvae, Whether they establish
breeding populations in the Indian River Lagoon has not been determined.
The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.