Besides mollusks, what other invertebrate groups are incorporated into the ray's diet?
Answer
Various crustaceans
While mollusks form the foundation of the Xingu River Ray's caloric intake, its diet is not exclusively limited to bivalves and gastropods. The ray supplements its main food source by consuming other bottom-dwelling fare found on the river floor. Specifically mentioned alongside mollusks are various crustaceans, which are also invertebrates associated with the benthic zone. Additionally, small fish may occasionally be incorporated, depending on seasonal availability, but crustaceans are a recognized component of the supplementary invertebrate diet.

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