Smooth muscle “microsphincters” in the gastric mucosa of stingrays (Elasmobranchii, Dasyatidae)

Aaron C. Henderson, Stephan Bruns, Shamsa Al Hameli

Research output: Contribution to journalArticlepeer-review


The occurrence of smooth muscle sphincters around gastric gland tubules in the cardiac stomach of some elasmobranch species is reported for the first time. These “microsphincters” took the form of a twisted torus, approximately 12–16 muscle fibres thick, that could fully constrict the gland tubules. However, their inconsistent positioning does not suggest a role in partitioning the tubules from the stomach lumen or in modulating secretory activity. Further research is required to ascertain the full taxonomic occurrence of these structures across the Elasmobranchii and to elucidate their function.

Original languageEnglish
Pages (from-to)992-995
Number of pages4
JournalJournal of Fish Biology
Issue number4
Publication statusPublished - Apr 2023


  • batoid
  • digestion
  • histology
  • microanatomy
  • shark

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Aquatic Science


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