Sinistrofulgur contrarium is a fossil snail species of the busycon whelks in the family Busyconidae. There has been some confusion about the correct taxonomy of this species, which has been confused with the extant species Sinistrofulgur sinistrum Hollister, 1958, and Sinistrofulgur perversum (Linnaeus, 1758)J. Wise, M. G. Harasewych, R. T. Dillon Jr. (2004). Population divergence in the sinistral whelks of North America, with special reference to the east Florida ecotone (PDF; 673 kB). Marine Biology 145, pp. 1167–1179.
Description Shell size of this operculated sinistral species 170 mm.
Distribution In muddy sand with sea-grass: Sanibel Island, Florida.
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