How is the pectoral disc shape of the Xingu River Ray generally described?
Answer
Nearly circular or oval
The defining silhouette of the Xingu River Ray is determined by its pectoral disc, which is typically characterized as being flat and almost circular or oval in shape. More specifically, the disc has a thick consistency and exhibits minimal variation in length versus width, contributing to its overall pancake-like profile when resting on the substrate. This shape differs from some marine relatives whose pectoral fins might be more broadly expansive; the fins here are thick and subcircular, used for subtle undulations near the river bottom.
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