Abstract
1. 1. Uterine fluid and blood plasma samples from pregnant specimens of the viviparous sharks Squalus acanthias, Carcharhinus plumbeus, Mustelus canis and Rhizoprionodon terraenovae were subjected to analysis of free amino acids by high-pressure liquid chromatography. 2. 2. Intracapsular uterine fluid of the matrotroph, Rhizoprionodon terraenovae, whose embryos bear appendiculae, is rich in taurine, glutamate, valine, nor-leucine and phenylalanine and exhibits higher concentrations of all amino acids than the uterine fluids of placental matrotrophs lacking appendiculae. 3. 3. Results are discussed in relation to the evolution of maternal-embryonic transfer mechanisms in viviparous sharks.
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