Abstract
Summary
Alpha-estradiol benzoate induced the dissolution of one or two anterior hemal spines in a significant number of immature and maturing male platyfish but elicited no response in adult males. Methyl testosterone, administered to adult female platyfish, induced the fusion of 2 series of small, basal bony elements, the mesonosts and baseosts. The mesonosts ordinarily discrete, became fused to the ventral surfaces of the interhemal spines. The baseosts, normally bipartite, became unipartite.
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