Abstract: Three species of the radiolitid rudist Biradiolites, B. rudissimus Trechmann, B. jamaicensis Trechmann, and B. mooretowensis(Trechmann), distinguished by differences in their radial bands, occur in the upper Maastrichtian limestones of Jamaica. Biradiolitesrudissimus is found predominantly in impure (clayey and silty) limestones and shales. It grows as individuals or rarely in small bouquetsof up to three individuals. The shell is characterized by a wide cone, and specimens are commonly preserved in life orientation. B. rudissimus was adapted to life in impure carbonates with moderate clay influx. Biradiolites jamaicensis is found predominantly in limestones, and occursonly as obviously transported valves in shale lithologies. It occurs in four growth structures: isolated clingers attached over a considerableportion of their anterior surface to an underlying limestone bed; large low superstratal hemispherical bouquets consisting of straightindividuals; ramifying open clusters with right valves parallel to the sediment surface; and isolated elevators in constratal growth fabrics. Biradiolitesmooretownensis Trechmann occurs as small bouquets with up to several hundred small individuals in sandy shale lithotypes and as largebouquets (up to 1 m diameter, and heights of 40 cm or more) of many thousands of specimens in low-diversity rudist limestones. The speciesof Biradiolites in the Maastrichtian of Jamaica are interpreted as highly opportunistic forms. B. rudissimus was capable of colonizing a varietyof substrates, including clay-dominated, soft bottoms and impure limestones—lack of organic material suggests reduced nutrientenvironments. B. jamaicaensis was a widely developed colonizer of various limestones and adopted growth strategies cognizant ofsedimentation rates and growth densities. B. mooretownensis was more specialized and lived in more marginal environments with highnutrient fluxes or high to very high sedimentation rates.