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Details of Structure and Functioning of the Pharyngeal Jaw Apparatus of Ember Parrotfish Scarus rubroviolaceus (Scaridae)

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Abstract

The structural details of some muscles, ligaments, aponeurotic structures, and osteological features of the pharyngeal jaw apparatus of ember parrotfish Scarus rubroviolaceus were studied. During the preparation, the evidence of the presence of a palatal organ in this species, which is convergently similar to that of benthic fish species of Cyprinidae and Catostomidae, has been found. The indirect effect of contraction of m. geniohyoideus and m. sternohyoideus on the operation of the pharyngeal jaw is discussed. Based on the results of anatomy and analysis of the literature, the interpretation of previously obtained morphofunctional data characterizing the apparatus of the pharyngeal jaws of parrotfish (Scaridae) is corrected using S. rubroviolaceus as an example.

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Notes

  1. 1.

    Liem and Sanderson (1986) speak in favor of a similar effect of the contraction of m. geniohyoideus on the gill grid in Labridae; however, they do not consider the morphological facts leading to this result.

  2. 2.

    The examples of asynchronous operation of bilaterally symmetric visceral PJA muscles have been described previously (Claes and Vree, 1991; Vandewalle et al., 2000).

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Gromova, E.S., Maktotin, V.V. Details of Structure and Functioning of the Pharyngeal Jaw Apparatus of Ember Parrotfish Scarus rubroviolaceus (Scaridae). J. Ichthyol. 59, 907–927 (2019). https://doi.org/10.1134/S0032945219060031

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Keywords:

  • ember parrotfish Scarus rubroviolaceus
  • pharyngeal jaw apparatus
  • functional morphology
  • palatal organ
  • food grinding
  • feeding type