Abstract
Oxygen and carbon stable isotope profiles were constructed for two species of large subtropical gastropods of the family Fasciolariidae—Triplofusus giganteus and Fasciolaria tulipa—from the Florida Keys and the Baha- mas, to evaluate their life history and to assess their poten- tial as paleoenvironmental proxies. Oxygen isotope pro- files revealed T. giganteus and F. tulipa grew their shells for 6 and 3 respectively. Both mollusks show faster growth rates during the first half of their lifespan. Mean annual temperatures (Ma T) derived from oxygen iso- topes for T. giganteus were 26.5 °C and for F. tulipa were 26.7 °C, both matching instrumental Ma Ts of 26.7 and 26.5 °C for the Florida Keys. Both shells, however, failed to record entire mean annual temperature ranges (Mar T). Fasciolaria tulipa yielded a calculated Mar T of 5.6 °C compared with a measured Mar T of 9.3 °C, and T. gigan- teus showed a calculated Mar T of 6.9 °C compared with
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