From myo- + -phore.
myophore (plural myophores)
- The point of attachment of a muscle to the shell of a mollusc
2015 July 17, Rafael Araujo, Yde de Jong, “Fauna Europaea: Mollusca – Bivalvia”, in Biodiversity Data Journal[1], →DOI:The umbo cavity is bridged by a septum or myophore.